4.0 head to 4.2 block conversion
05-21-2004, 10:26 PM
#1
Guest
Posts: n/a
4.0 head to 4.2 block conversion
Anyone out there dome a 4.0 head conversion on a 258 engine? I know about
the water jacket passages that need blocking and exhaust manifold and valve
covers need replacing but what else? It just seems too easy....or is it that
easy? I've read a number of articles on the net but none seem to mention
about any valvetrain mods needed to do the job. I can't imagine that the
rods just go right in without change... and how did you check to make sure
the valves opened correctly? Any feedback would be helpful.
Thanks,
Rich
86 CJ7 1"body lift, 2-1/2"YJ spring Rubicon express lift, Detroits front and
rear, 4:10 gears, 1pc axles, Mopar MPFI and other miscellaneous offroad
related crap.
the water jacket passages that need blocking and exhaust manifold and valve
covers need replacing but what else? It just seems too easy....or is it that
easy? I've read a number of articles on the net but none seem to mention
about any valvetrain mods needed to do the job. I can't imagine that the
rods just go right in without change... and how did you check to make sure
the valves opened correctly? Any feedback would be helpful.
Thanks,
Rich
86 CJ7 1"body lift, 2-1/2"YJ spring Rubicon express lift, Detroits front and
rear, 4:10 gears, 1pc axles, Mopar MPFI and other miscellaneous offroad
related crap.
05-23-2004, 04:08 PM
#2
Guest
Posts: n/a
Re: 4.0 head to 4.2 block conversion
richard-check out this site:
http://www.sierrajeep.com
as far as i know, you should be able to use the stock lifters and pushrods.
unless you have the head milled a lot. i'm going to be doing this swap
(along with rebuilt block and 258) in a few months. i'll post the results.
william oliveri in this group has done the swap.
try here too:
http://www.cjoffroad.com
they have a section called "4.0 something..." do a search in there. good
luck!
"Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
news:PTyrc.561$wO4.248@twister.socal.rr.com...
> Anyone out there dome a 4.0 head conversion on a 258 engine? I know about
> the water jacket passages that need blocking and exhaust manifold and
valve
> covers need replacing but what else? It just seems too easy....or is it
that
> easy? I've read a number of articles on the net but none seem to mention
> about any valvetrain mods needed to do the job. I can't imagine that the
> rods just go right in without change... and how did you check to make sure
> the valves opened correctly? Any feedback would be helpful.
> Thanks,
> Rich
> 86 CJ7 1"body lift, 2-1/2"YJ spring Rubicon express lift, Detroits front
and
> rear, 4:10 gears, 1pc axles, Mopar MPFI and other miscellaneous offroad
> related crap.
>
>
http://www.sierrajeep.com
as far as i know, you should be able to use the stock lifters and pushrods.
unless you have the head milled a lot. i'm going to be doing this swap
(along with rebuilt block and 258) in a few months. i'll post the results.
william oliveri in this group has done the swap.
try here too:
http://www.cjoffroad.com
they have a section called "4.0 something..." do a search in there. good
luck!
"Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
news:PTyrc.561$wO4.248@twister.socal.rr.com...
> Anyone out there dome a 4.0 head conversion on a 258 engine? I know about
> the water jacket passages that need blocking and exhaust manifold and
valve
> covers need replacing but what else? It just seems too easy....or is it
that
> easy? I've read a number of articles on the net but none seem to mention
> about any valvetrain mods needed to do the job. I can't imagine that the
> rods just go right in without change... and how did you check to make sure
> the valves opened correctly? Any feedback would be helpful.
> Thanks,
> Rich
> 86 CJ7 1"body lift, 2-1/2"YJ spring Rubicon express lift, Detroits front
and
> rear, 4:10 gears, 1pc axles, Mopar MPFI and other miscellaneous offroad
> related crap.
>
>
05-23-2004, 04:08 PM
#3
Guest
Posts: n/a
Re: 4.0 head to 4.2 block conversion
richard-check out this site:
http://www.sierrajeep.com
as far as i know, you should be able to use the stock lifters and pushrods.
unless you have the head milled a lot. i'm going to be doing this swap
(along with rebuilt block and 258) in a few months. i'll post the results.
william oliveri in this group has done the swap.
try here too:
http://www.cjoffroad.com
they have a section called "4.0 something..." do a search in there. good
luck!
"Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
news:PTyrc.561$wO4.248@twister.socal.rr.com...
> Anyone out there dome a 4.0 head conversion on a 258 engine? I know about
> the water jacket passages that need blocking and exhaust manifold and
valve
> covers need replacing but what else? It just seems too easy....or is it
that
> easy? I've read a number of articles on the net but none seem to mention
> about any valvetrain mods needed to do the job. I can't imagine that the
> rods just go right in without change... and how did you check to make sure
> the valves opened correctly? Any feedback would be helpful.
> Thanks,
> Rich
> 86 CJ7 1"body lift, 2-1/2"YJ spring Rubicon express lift, Detroits front
and
> rear, 4:10 gears, 1pc axles, Mopar MPFI and other miscellaneous offroad
> related crap.
>
>
http://www.sierrajeep.com
as far as i know, you should be able to use the stock lifters and pushrods.
unless you have the head milled a lot. i'm going to be doing this swap
(along with rebuilt block and 258) in a few months. i'll post the results.
william oliveri in this group has done the swap.
try here too:
http://www.cjoffroad.com
they have a section called "4.0 something..." do a search in there. good
luck!
"Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
news:PTyrc.561$wO4.248@twister.socal.rr.com...
> Anyone out there dome a 4.0 head conversion on a 258 engine? I know about
> the water jacket passages that need blocking and exhaust manifold and
valve
> covers need replacing but what else? It just seems too easy....or is it
that
> easy? I've read a number of articles on the net but none seem to mention
> about any valvetrain mods needed to do the job. I can't imagine that the
> rods just go right in without change... and how did you check to make sure
> the valves opened correctly? Any feedback would be helpful.
> Thanks,
> Rich
> 86 CJ7 1"body lift, 2-1/2"YJ spring Rubicon express lift, Detroits front
and
> rear, 4:10 gears, 1pc axles, Mopar MPFI and other miscellaneous offroad
> related crap.
>
>
05-23-2004, 04:08 PM
#4
Guest
Posts: n/a
Re: 4.0 head to 4.2 block conversion
richard-check out this site:
http://www.sierrajeep.com
as far as i know, you should be able to use the stock lifters and pushrods.
unless you have the head milled a lot. i'm going to be doing this swap
(along with rebuilt block and 258) in a few months. i'll post the results.
william oliveri in this group has done the swap.
try here too:
http://www.cjoffroad.com
they have a section called "4.0 something..." do a search in there. good
luck!
"Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
news:PTyrc.561$wO4.248@twister.socal.rr.com...
> Anyone out there dome a 4.0 head conversion on a 258 engine? I know about
> the water jacket passages that need blocking and exhaust manifold and
valve
> covers need replacing but what else? It just seems too easy....or is it
that
> easy? I've read a number of articles on the net but none seem to mention
> about any valvetrain mods needed to do the job. I can't imagine that the
> rods just go right in without change... and how did you check to make sure
> the valves opened correctly? Any feedback would be helpful.
> Thanks,
> Rich
> 86 CJ7 1"body lift, 2-1/2"YJ spring Rubicon express lift, Detroits front
and
> rear, 4:10 gears, 1pc axles, Mopar MPFI and other miscellaneous offroad
> related crap.
>
>
http://www.sierrajeep.com
as far as i know, you should be able to use the stock lifters and pushrods.
unless you have the head milled a lot. i'm going to be doing this swap
(along with rebuilt block and 258) in a few months. i'll post the results.
william oliveri in this group has done the swap.
try here too:
http://www.cjoffroad.com
they have a section called "4.0 something..." do a search in there. good
luck!
"Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
news:PTyrc.561$wO4.248@twister.socal.rr.com...
> Anyone out there dome a 4.0 head conversion on a 258 engine? I know about
> the water jacket passages that need blocking and exhaust manifold and
valve
> covers need replacing but what else? It just seems too easy....or is it
that
> easy? I've read a number of articles on the net but none seem to mention
> about any valvetrain mods needed to do the job. I can't imagine that the
> rods just go right in without change... and how did you check to make sure
> the valves opened correctly? Any feedback would be helpful.
> Thanks,
> Rich
> 86 CJ7 1"body lift, 2-1/2"YJ spring Rubicon express lift, Detroits front
and
> rear, 4:10 gears, 1pc axles, Mopar MPFI and other miscellaneous offroad
> related crap.
>
>
05-23-2004, 04:08 PM
#5
Guest
Posts: n/a
Re: 4.0 head to 4.2 block conversion
richard-check out this site:
http://www.sierrajeep.com
as far as i know, you should be able to use the stock lifters and pushrods.
unless you have the head milled a lot. i'm going to be doing this swap
(along with rebuilt block and 258) in a few months. i'll post the results.
william oliveri in this group has done the swap.
try here too:
http://www.cjoffroad.com
they have a section called "4.0 something..." do a search in there. good
luck!
"Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
news:PTyrc.561$wO4.248@twister.socal.rr.com...
> Anyone out there dome a 4.0 head conversion on a 258 engine? I know about
> the water jacket passages that need blocking and exhaust manifold and
valve
> covers need replacing but what else? It just seems too easy....or is it
that
> easy? I've read a number of articles on the net but none seem to mention
> about any valvetrain mods needed to do the job. I can't imagine that the
> rods just go right in without change... and how did you check to make sure
> the valves opened correctly? Any feedback would be helpful.
> Thanks,
> Rich
> 86 CJ7 1"body lift, 2-1/2"YJ spring Rubicon express lift, Detroits front
and
> rear, 4:10 gears, 1pc axles, Mopar MPFI and other miscellaneous offroad
> related crap.
>
>
http://www.sierrajeep.com
as far as i know, you should be able to use the stock lifters and pushrods.
unless you have the head milled a lot. i'm going to be doing this swap
(along with rebuilt block and 258) in a few months. i'll post the results.
william oliveri in this group has done the swap.
try here too:
http://www.cjoffroad.com
they have a section called "4.0 something..." do a search in there. good
luck!
"Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
news:PTyrc.561$wO4.248@twister.socal.rr.com...
> Anyone out there dome a 4.0 head conversion on a 258 engine? I know about
> the water jacket passages that need blocking and exhaust manifold and
valve
> covers need replacing but what else? It just seems too easy....or is it
that
> easy? I've read a number of articles on the net but none seem to mention
> about any valvetrain mods needed to do the job. I can't imagine that the
> rods just go right in without change... and how did you check to make sure
> the valves opened correctly? Any feedback would be helpful.
> Thanks,
> Rich
> 86 CJ7 1"body lift, 2-1/2"YJ spring Rubicon express lift, Detroits front
and
> rear, 4:10 gears, 1pc axles, Mopar MPFI and other miscellaneous offroad
> related crap.
>
>
05-24-2004, 11:40 AM
#6
Guest
Posts: n/a
Re: 4.0 head to 4.2 block conversion
Well, I had the machinist do mine and he told me he used the 4.2L push rods.
I used the recommended 4.0L block cast # 7120. Had a 3 angle valve job done
on it and the water jackets were sealed by the previous owner as he was
going to do this swap but changed his mind.
Other than that, every thing else was stock 4.2L parts on the short block
and stock parts on the 4.0L head. No changes to the valve train.
It depends on where you get your exhaust manifold. I got mine from
http://www.1aauto.com/ and had to add the O2 sensor bug.
I also had to modify my tail pipe to fit to the new exhaust manifold. I had
to get a new 'donut' fitting to marry to the exhaust pipe.
Just a bunch of little things which did add up.
Bill
"serg" <none@none.com> wrote in message
news:_w7sc.56165$jS4.32409@newssvr29.news.prodigy. com...
> richard-check out this site:
> http://www.sierrajeep.com
>
> as far as i know, you should be able to use the stock lifters and
pushrods.
> unless you have the head milled a lot. i'm going to be doing this swap
> (along with rebuilt block and 258) in a few months. i'll post the
results.
> william oliveri in this group has done the swap.
>
> try here too:
> http://www.cjoffroad.com
>
> they have a section called "4.0 something..." do a search in there. good
> luck!
> "Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
> news:PTyrc.561$wO4.248@twister.socal.rr.com...
> > Anyone out there dome a 4.0 head conversion on a 258 engine? I know
about
> > the water jacket passages that need blocking and exhaust manifold and
> valve
> > covers need replacing but what else? It just seems too easy....or is it
> that
> > easy? I've read a number of articles on the net but none seem to mention
> > about any valvetrain mods needed to do the job. I can't imagine that the
> > rods just go right in without change... and how did you check to make
sure
> > the valves opened correctly? Any feedback would be helpful.
> > Thanks,
> > Rich
> > 86 CJ7 1"body lift, 2-1/2"YJ spring Rubicon express lift, Detroits front
> and
> > rear, 4:10 gears, 1pc axles, Mopar MPFI and other miscellaneous offroad
> > related crap.
> >
> >
>
>
I used the recommended 4.0L block cast # 7120. Had a 3 angle valve job done
on it and the water jackets were sealed by the previous owner as he was
going to do this swap but changed his mind.
Other than that, every thing else was stock 4.2L parts on the short block
and stock parts on the 4.0L head. No changes to the valve train.
It depends on where you get your exhaust manifold. I got mine from
http://www.1aauto.com/ and had to add the O2 sensor bug.
I also had to modify my tail pipe to fit to the new exhaust manifold. I had
to get a new 'donut' fitting to marry to the exhaust pipe.
Just a bunch of little things which did add up.
Bill
"serg" <none@none.com> wrote in message
news:_w7sc.56165$jS4.32409@newssvr29.news.prodigy. com...
> richard-check out this site:
> http://www.sierrajeep.com
>
> as far as i know, you should be able to use the stock lifters and
pushrods.
> unless you have the head milled a lot. i'm going to be doing this swap
> (along with rebuilt block and 258) in a few months. i'll post the
results.
> william oliveri in this group has done the swap.
>
> try here too:
> http://www.cjoffroad.com
>
> they have a section called "4.0 something..." do a search in there. good
> luck!
> "Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
> news:PTyrc.561$wO4.248@twister.socal.rr.com...
> > Anyone out there dome a 4.0 head conversion on a 258 engine? I know
about
> > the water jacket passages that need blocking and exhaust manifold and
> valve
> > covers need replacing but what else? It just seems too easy....or is it
> that
> > easy? I've read a number of articles on the net but none seem to mention
> > about any valvetrain mods needed to do the job. I can't imagine that the
> > rods just go right in without change... and how did you check to make
sure
> > the valves opened correctly? Any feedback would be helpful.
> > Thanks,
> > Rich
> > 86 CJ7 1"body lift, 2-1/2"YJ spring Rubicon express lift, Detroits front
> and
> > rear, 4:10 gears, 1pc axles, Mopar MPFI and other miscellaneous offroad
> > related crap.
> >
> >
>
>
05-24-2004, 11:40 AM
#7
Guest
Posts: n/a
Re: 4.0 head to 4.2 block conversion
Well, I had the machinist do mine and he told me he used the 4.2L push rods.
I used the recommended 4.0L block cast # 7120. Had a 3 angle valve job done
on it and the water jackets were sealed by the previous owner as he was
going to do this swap but changed his mind.
Other than that, every thing else was stock 4.2L parts on the short block
and stock parts on the 4.0L head. No changes to the valve train.
It depends on where you get your exhaust manifold. I got mine from
http://www.1aauto.com/ and had to add the O2 sensor bug.
I also had to modify my tail pipe to fit to the new exhaust manifold. I had
to get a new 'donut' fitting to marry to the exhaust pipe.
Just a bunch of little things which did add up.
Bill
"serg" <none@none.com> wrote in message
news:_w7sc.56165$jS4.32409@newssvr29.news.prodigy. com...
> richard-check out this site:
> http://www.sierrajeep.com
>
> as far as i know, you should be able to use the stock lifters and
pushrods.
> unless you have the head milled a lot. i'm going to be doing this swap
> (along with rebuilt block and 258) in a few months. i'll post the
results.
> william oliveri in this group has done the swap.
>
> try here too:
> http://www.cjoffroad.com
>
> they have a section called "4.0 something..." do a search in there. good
> luck!
> "Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
> news:PTyrc.561$wO4.248@twister.socal.rr.com...
> > Anyone out there dome a 4.0 head conversion on a 258 engine? I know
about
> > the water jacket passages that need blocking and exhaust manifold and
> valve
> > covers need replacing but what else? It just seems too easy....or is it
> that
> > easy? I've read a number of articles on the net but none seem to mention
> > about any valvetrain mods needed to do the job. I can't imagine that the
> > rods just go right in without change... and how did you check to make
sure
> > the valves opened correctly? Any feedback would be helpful.
> > Thanks,
> > Rich
> > 86 CJ7 1"body lift, 2-1/2"YJ spring Rubicon express lift, Detroits front
> and
> > rear, 4:10 gears, 1pc axles, Mopar MPFI and other miscellaneous offroad
> > related crap.
> >
> >
>
>
I used the recommended 4.0L block cast # 7120. Had a 3 angle valve job done
on it and the water jackets were sealed by the previous owner as he was
going to do this swap but changed his mind.
Other than that, every thing else was stock 4.2L parts on the short block
and stock parts on the 4.0L head. No changes to the valve train.
It depends on where you get your exhaust manifold. I got mine from
http://www.1aauto.com/ and had to add the O2 sensor bug.
I also had to modify my tail pipe to fit to the new exhaust manifold. I had
to get a new 'donut' fitting to marry to the exhaust pipe.
Just a bunch of little things which did add up.
Bill
"serg" <none@none.com> wrote in message
news:_w7sc.56165$jS4.32409@newssvr29.news.prodigy. com...
> richard-check out this site:
> http://www.sierrajeep.com
>
> as far as i know, you should be able to use the stock lifters and
pushrods.
> unless you have the head milled a lot. i'm going to be doing this swap
> (along with rebuilt block and 258) in a few months. i'll post the
results.
> william oliveri in this group has done the swap.
>
> try here too:
> http://www.cjoffroad.com
>
> they have a section called "4.0 something..." do a search in there. good
> luck!
> "Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
> news:PTyrc.561$wO4.248@twister.socal.rr.com...
> > Anyone out there dome a 4.0 head conversion on a 258 engine? I know
about
> > the water jacket passages that need blocking and exhaust manifold and
> valve
> > covers need replacing but what else? It just seems too easy....or is it
> that
> > easy? I've read a number of articles on the net but none seem to mention
> > about any valvetrain mods needed to do the job. I can't imagine that the
> > rods just go right in without change... and how did you check to make
sure
> > the valves opened correctly? Any feedback would be helpful.
> > Thanks,
> > Rich
> > 86 CJ7 1"body lift, 2-1/2"YJ spring Rubicon express lift, Detroits front
> and
> > rear, 4:10 gears, 1pc axles, Mopar MPFI and other miscellaneous offroad
> > related crap.
> >
> >
>
>
05-24-2004, 11:40 AM
#8
Guest
Posts: n/a
Re: 4.0 head to 4.2 block conversion
Well, I had the machinist do mine and he told me he used the 4.2L push rods.
I used the recommended 4.0L block cast # 7120. Had a 3 angle valve job done
on it and the water jackets were sealed by the previous owner as he was
going to do this swap but changed his mind.
Other than that, every thing else was stock 4.2L parts on the short block
and stock parts on the 4.0L head. No changes to the valve train.
It depends on where you get your exhaust manifold. I got mine from
http://www.1aauto.com/ and had to add the O2 sensor bug.
I also had to modify my tail pipe to fit to the new exhaust manifold. I had
to get a new 'donut' fitting to marry to the exhaust pipe.
Just a bunch of little things which did add up.
Bill
"serg" <none@none.com> wrote in message
news:_w7sc.56165$jS4.32409@newssvr29.news.prodigy. com...
> richard-check out this site:
> http://www.sierrajeep.com
>
> as far as i know, you should be able to use the stock lifters and
pushrods.
> unless you have the head milled a lot. i'm going to be doing this swap
> (along with rebuilt block and 258) in a few months. i'll post the
results.
> william oliveri in this group has done the swap.
>
> try here too:
> http://www.cjoffroad.com
>
> they have a section called "4.0 something..." do a search in there. good
> luck!
> "Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
> news:PTyrc.561$wO4.248@twister.socal.rr.com...
> > Anyone out there dome a 4.0 head conversion on a 258 engine? I know
about
> > the water jacket passages that need blocking and exhaust manifold and
> valve
> > covers need replacing but what else? It just seems too easy....or is it
> that
> > easy? I've read a number of articles on the net but none seem to mention
> > about any valvetrain mods needed to do the job. I can't imagine that the
> > rods just go right in without change... and how did you check to make
sure
> > the valves opened correctly? Any feedback would be helpful.
> > Thanks,
> > Rich
> > 86 CJ7 1"body lift, 2-1/2"YJ spring Rubicon express lift, Detroits front
> and
> > rear, 4:10 gears, 1pc axles, Mopar MPFI and other miscellaneous offroad
> > related crap.
> >
> >
>
>
I used the recommended 4.0L block cast # 7120. Had a 3 angle valve job done
on it and the water jackets were sealed by the previous owner as he was
going to do this swap but changed his mind.
Other than that, every thing else was stock 4.2L parts on the short block
and stock parts on the 4.0L head. No changes to the valve train.
It depends on where you get your exhaust manifold. I got mine from
http://www.1aauto.com/ and had to add the O2 sensor bug.
I also had to modify my tail pipe to fit to the new exhaust manifold. I had
to get a new 'donut' fitting to marry to the exhaust pipe.
Just a bunch of little things which did add up.
Bill
"serg" <none@none.com> wrote in message
news:_w7sc.56165$jS4.32409@newssvr29.news.prodigy. com...
> richard-check out this site:
> http://www.sierrajeep.com
>
> as far as i know, you should be able to use the stock lifters and
pushrods.
> unless you have the head milled a lot. i'm going to be doing this swap
> (along with rebuilt block and 258) in a few months. i'll post the
results.
> william oliveri in this group has done the swap.
>
> try here too:
> http://www.cjoffroad.com
>
> they have a section called "4.0 something..." do a search in there. good
> luck!
> "Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
> news:PTyrc.561$wO4.248@twister.socal.rr.com...
> > Anyone out there dome a 4.0 head conversion on a 258 engine? I know
about
> > the water jacket passages that need blocking and exhaust manifold and
> valve
> > covers need replacing but what else? It just seems too easy....or is it
> that
> > easy? I've read a number of articles on the net but none seem to mention
> > about any valvetrain mods needed to do the job. I can't imagine that the
> > rods just go right in without change... and how did you check to make
sure
> > the valves opened correctly? Any feedback would be helpful.
> > Thanks,
> > Rich
> > 86 CJ7 1"body lift, 2-1/2"YJ spring Rubicon express lift, Detroits front
> and
> > rear, 4:10 gears, 1pc axles, Mopar MPFI and other miscellaneous offroad
> > related crap.
> >
> >
>
>
05-24-2004, 11:40 AM
#9
Guest
Posts: n/a
Re: 4.0 head to 4.2 block conversion
Well, I had the machinist do mine and he told me he used the 4.2L push rods.
I used the recommended 4.0L block cast # 7120. Had a 3 angle valve job done
on it and the water jackets were sealed by the previous owner as he was
going to do this swap but changed his mind.
Other than that, every thing else was stock 4.2L parts on the short block
and stock parts on the 4.0L head. No changes to the valve train.
It depends on where you get your exhaust manifold. I got mine from
http://www.1aauto.com/ and had to add the O2 sensor bug.
I also had to modify my tail pipe to fit to the new exhaust manifold. I had
to get a new 'donut' fitting to marry to the exhaust pipe.
Just a bunch of little things which did add up.
Bill
"serg" <none@none.com> wrote in message
news:_w7sc.56165$jS4.32409@newssvr29.news.prodigy. com...
> richard-check out this site:
> http://www.sierrajeep.com
>
> as far as i know, you should be able to use the stock lifters and
pushrods.
> unless you have the head milled a lot. i'm going to be doing this swap
> (along with rebuilt block and 258) in a few months. i'll post the
results.
> william oliveri in this group has done the swap.
>
> try here too:
> http://www.cjoffroad.com
>
> they have a section called "4.0 something..." do a search in there. good
> luck!
> "Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
> news:PTyrc.561$wO4.248@twister.socal.rr.com...
> > Anyone out there dome a 4.0 head conversion on a 258 engine? I know
about
> > the water jacket passages that need blocking and exhaust manifold and
> valve
> > covers need replacing but what else? It just seems too easy....or is it
> that
> > easy? I've read a number of articles on the net but none seem to mention
> > about any valvetrain mods needed to do the job. I can't imagine that the
> > rods just go right in without change... and how did you check to make
sure
> > the valves opened correctly? Any feedback would be helpful.
> > Thanks,
> > Rich
> > 86 CJ7 1"body lift, 2-1/2"YJ spring Rubicon express lift, Detroits front
> and
> > rear, 4:10 gears, 1pc axles, Mopar MPFI and other miscellaneous offroad
> > related crap.
> >
> >
>
>
I used the recommended 4.0L block cast # 7120. Had a 3 angle valve job done
on it and the water jackets were sealed by the previous owner as he was
going to do this swap but changed his mind.
Other than that, every thing else was stock 4.2L parts on the short block
and stock parts on the 4.0L head. No changes to the valve train.
It depends on where you get your exhaust manifold. I got mine from
http://www.1aauto.com/ and had to add the O2 sensor bug.
I also had to modify my tail pipe to fit to the new exhaust manifold. I had
to get a new 'donut' fitting to marry to the exhaust pipe.
Just a bunch of little things which did add up.
Bill
"serg" <none@none.com> wrote in message
news:_w7sc.56165$jS4.32409@newssvr29.news.prodigy. com...
> richard-check out this site:
> http://www.sierrajeep.com
>
> as far as i know, you should be able to use the stock lifters and
pushrods.
> unless you have the head milled a lot. i'm going to be doing this swap
> (along with rebuilt block and 258) in a few months. i'll post the
results.
> william oliveri in this group has done the swap.
>
> try here too:
> http://www.cjoffroad.com
>
> they have a section called "4.0 something..." do a search in there. good
> luck!
> "Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
> news:PTyrc.561$wO4.248@twister.socal.rr.com...
> > Anyone out there dome a 4.0 head conversion on a 258 engine? I know
about
> > the water jacket passages that need blocking and exhaust manifold and
> valve
> > covers need replacing but what else? It just seems too easy....or is it
> that
> > easy? I've read a number of articles on the net but none seem to mention
> > about any valvetrain mods needed to do the job. I can't imagine that the
> > rods just go right in without change... and how did you check to make
sure
> > the valves opened correctly? Any feedback would be helpful.
> > Thanks,
> > Rich
> > 86 CJ7 1"body lift, 2-1/2"YJ spring Rubicon express lift, Detroits front
> and
> > rear, 4:10 gears, 1pc axles, Mopar MPFI and other miscellaneous offroad
> > related crap.
> >
> >
>
>
05-24-2004, 06:51 PM
#10
Guest
Posts: n/a
Re: 4.0 head to 4.2 block conversion
Thanks Bill. What was your end result? Are you happy with it? Was it worth
the work?
Rich
"William Oliveri" <wuji@bigvalley.net> wrote in message
news:2hej47FbjtsrU1@uni-berlin.de...
> Well, I had the machinist do mine and he told me he used the 4.2L push
rods.
> I used the recommended 4.0L block cast # 7120. Had a 3 angle valve job
done
> on it and the water jackets were sealed by the previous owner as he was
> going to do this swap but changed his mind.
>
> Other than that, every thing else was stock 4.2L parts on the short block
> and stock parts on the 4.0L head. No changes to the valve train.
>
> It depends on where you get your exhaust manifold. I got mine from
> http://www.1aauto.com/ and had to add the O2 sensor bug.
>
> I also had to modify my tail pipe to fit to the new exhaust manifold. I
had
> to get a new 'donut' fitting to marry to the exhaust pipe.
>
> Just a bunch of little things which did add up.
>
> Bill
>
>
>
> "serg" <none@none.com> wrote in message
> news:_w7sc.56165$jS4.32409@newssvr29.news.prodigy. com...
> > richard-check out this site:
> > http://www.sierrajeep.com
> >
> > as far as i know, you should be able to use the stock lifters and
> pushrods.
> > unless you have the head milled a lot. i'm going to be doing this swap
> > (along with rebuilt block and 258) in a few months. i'll post the
> results.
> > william oliveri in this group has done the swap.
> >
> > try here too:
> > http://www.cjoffroad.com
> >
> > they have a section called "4.0 something..." do a search in there.
good
> > luck!
> > "Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
> > news:PTyrc.561$wO4.248@twister.socal.rr.com...
> > > Anyone out there dome a 4.0 head conversion on a 258 engine? I know
> about
> > > the water jacket passages that need blocking and exhaust manifold and
> > valve
> > > covers need replacing but what else? It just seems too easy....or is
it
> > that
> > > easy? I've read a number of articles on the net but none seem to
mention
> > > about any valvetrain mods needed to do the job. I can't imagine that
the
> > > rods just go right in without change... and how did you check to make
> sure
> > > the valves opened correctly? Any feedback would be helpful.
> > > Thanks,
> > > Rich
> > > 86 CJ7 1"body lift, 2-1/2"YJ spring Rubicon express lift, Detroits
front
> > and
> > > rear, 4:10 gears, 1pc axles, Mopar MPFI and other miscellaneous
offroad
> > > related crap.
> > >
> > >
> >
> >
>
>
the work?
Rich
"William Oliveri" <wuji@bigvalley.net> wrote in message
news:2hej47FbjtsrU1@uni-berlin.de...
> Well, I had the machinist do mine and he told me he used the 4.2L push
rods.
> I used the recommended 4.0L block cast # 7120. Had a 3 angle valve job
done
> on it and the water jackets were sealed by the previous owner as he was
> going to do this swap but changed his mind.
>
> Other than that, every thing else was stock 4.2L parts on the short block
> and stock parts on the 4.0L head. No changes to the valve train.
>
> It depends on where you get your exhaust manifold. I got mine from
> http://www.1aauto.com/ and had to add the O2 sensor bug.
>
> I also had to modify my tail pipe to fit to the new exhaust manifold. I
had
> to get a new 'donut' fitting to marry to the exhaust pipe.
>
> Just a bunch of little things which did add up.
>
> Bill
>
>
>
> "serg" <none@none.com> wrote in message
> news:_w7sc.56165$jS4.32409@newssvr29.news.prodigy. com...
> > richard-check out this site:
> > http://www.sierrajeep.com
> >
> > as far as i know, you should be able to use the stock lifters and
> pushrods.
> > unless you have the head milled a lot. i'm going to be doing this swap
> > (along with rebuilt block and 258) in a few months. i'll post the
> results.
> > william oliveri in this group has done the swap.
> >
> > try here too:
> > http://www.cjoffroad.com
> >
> > they have a section called "4.0 something..." do a search in there.
good
> > luck!
> > "Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
> > news:PTyrc.561$wO4.248@twister.socal.rr.com...
> > > Anyone out there dome a 4.0 head conversion on a 258 engine? I know
> about
> > > the water jacket passages that need blocking and exhaust manifold and
> > valve
> > > covers need replacing but what else? It just seems too easy....or is
it
> > that
> > > easy? I've read a number of articles on the net but none seem to
mention
> > > about any valvetrain mods needed to do the job. I can't imagine that
the
> > > rods just go right in without change... and how did you check to make
> sure
> > > the valves opened correctly? Any feedback would be helpful.
> > > Thanks,
> > > Rich
> > > 86 CJ7 1"body lift, 2-1/2"YJ spring Rubicon express lift, Detroits
front
> > and
> > > rear, 4:10 gears, 1pc axles, Mopar MPFI and other miscellaneous
offroad
> > > related crap.
> > >
> > >
> >
> >
>
>
