4.0L Head Conversion for the 258
Guest
Posts: n/a
Re: 4.0L Head Conversion for the 258
NewbieJeepGuy wrote:
> Recently I've been reading about the 4.0L head conversion for the 4.2L
> 258 Jeep Engines. I have a 1990 Wrangler with the 4.2L 258 engine
> that needs to be rebuilt. While having this done I was thinking of
> doing the 4.0L head conversion and was wondering if anyone had any
> good feed back for the conversion or negative feedback. I understand
> it can give me more horsepower and better gas mileage as well.
>
> After looking into it it seems that the casting numbers for the 4.0L
> heads that I should look for are either the 7120 or the 0630 because
> of flow rates or something. As you can tell I've read some but am not
> very good at this stuff so was hoping for feedback again.
>
> Thanks.
>
The 4.0 head doesn't fit the 4.2 block, it overhangs so you have to
block a bunch of coolant holes in the 4.0 head with glue and pray the
glue doesn't fail when you are 25 miles from the nearest phone.
Not for me thanks...
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
'New' frame in the works for '08
> Recently I've been reading about the 4.0L head conversion for the 4.2L
> 258 Jeep Engines. I have a 1990 Wrangler with the 4.2L 258 engine
> that needs to be rebuilt. While having this done I was thinking of
> doing the 4.0L head conversion and was wondering if anyone had any
> good feed back for the conversion or negative feedback. I understand
> it can give me more horsepower and better gas mileage as well.
>
> After looking into it it seems that the casting numbers for the 4.0L
> heads that I should look for are either the 7120 or the 0630 because
> of flow rates or something. As you can tell I've read some but am not
> very good at this stuff so was hoping for feedback again.
>
> Thanks.
>
The 4.0 head doesn't fit the 4.2 block, it overhangs so you have to
block a bunch of coolant holes in the 4.0 head with glue and pray the
glue doesn't fail when you are 25 miles from the nearest phone.
Not for me thanks...
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
'New' frame in the works for '08
Guest
Posts: n/a
Re: 4.0L Head Conversion for the 258
NewbieJeepGuy wrote:
> Recently I've been reading about the 4.0L head conversion for the 4.2L
> 258 Jeep Engines. I have a 1990 Wrangler with the 4.2L 258 engine
> that needs to be rebuilt. While having this done I was thinking of
> doing the 4.0L head conversion and was wondering if anyone had any
> good feed back for the conversion or negative feedback. I understand
> it can give me more horsepower and better gas mileage as well.
>
> After looking into it it seems that the casting numbers for the 4.0L
> heads that I should look for are either the 7120 or the 0630 because
> of flow rates or something. As you can tell I've read some but am not
> very good at this stuff so was hoping for feedback again.
>
> Thanks.
>
The 4.0 head doesn't fit the 4.2 block, it overhangs so you have to
block a bunch of coolant holes in the 4.0 head with glue and pray the
glue doesn't fail when you are 25 miles from the nearest phone.
Not for me thanks...
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
'New' frame in the works for '08
> Recently I've been reading about the 4.0L head conversion for the 4.2L
> 258 Jeep Engines. I have a 1990 Wrangler with the 4.2L 258 engine
> that needs to be rebuilt. While having this done I was thinking of
> doing the 4.0L head conversion and was wondering if anyone had any
> good feed back for the conversion or negative feedback. I understand
> it can give me more horsepower and better gas mileage as well.
>
> After looking into it it seems that the casting numbers for the 4.0L
> heads that I should look for are either the 7120 or the 0630 because
> of flow rates or something. As you can tell I've read some but am not
> very good at this stuff so was hoping for feedback again.
>
> Thanks.
>
The 4.0 head doesn't fit the 4.2 block, it overhangs so you have to
block a bunch of coolant holes in the 4.0 head with glue and pray the
glue doesn't fail when you are 25 miles from the nearest phone.
Not for me thanks...
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
'New' frame in the works for '08
Guest
Posts: n/a
Re: 4.0L Head Conversion for the 258
NewbieJeepGuy wrote:
> Recently I've been reading about the 4.0L head conversion for the 4.2L
> 258 Jeep Engines. I have a 1990 Wrangler with the 4.2L 258 engine
> that needs to be rebuilt. While having this done I was thinking of
> doing the 4.0L head conversion and was wondering if anyone had any
> good feed back for the conversion or negative feedback. I understand
> it can give me more horsepower and better gas mileage as well.
>
> After looking into it it seems that the casting numbers for the 4.0L
> heads that I should look for are either the 7120 or the 0630 because
> of flow rates or something. As you can tell I've read some but am not
> very good at this stuff so was hoping for feedback again.
>
> Thanks.
>
The 4.0 head doesn't fit the 4.2 block, it overhangs so you have to
block a bunch of coolant holes in the 4.0 head with glue and pray the
glue doesn't fail when you are 25 miles from the nearest phone.
Not for me thanks...
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
'New' frame in the works for '08
> Recently I've been reading about the 4.0L head conversion for the 4.2L
> 258 Jeep Engines. I have a 1990 Wrangler with the 4.2L 258 engine
> that needs to be rebuilt. While having this done I was thinking of
> doing the 4.0L head conversion and was wondering if anyone had any
> good feed back for the conversion or negative feedback. I understand
> it can give me more horsepower and better gas mileage as well.
>
> After looking into it it seems that the casting numbers for the 4.0L
> heads that I should look for are either the 7120 or the 0630 because
> of flow rates or something. As you can tell I've read some but am not
> very good at this stuff so was hoping for feedback again.
>
> Thanks.
>
The 4.0 head doesn't fit the 4.2 block, it overhangs so you have to
block a bunch of coolant holes in the 4.0 head with glue and pray the
glue doesn't fail when you are 25 miles from the nearest phone.
Not for me thanks...
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
'New' frame in the works for '08
Guest
Posts: n/a
Re: Re: 4.0L Head Conversion for the 258
In article <i6t8j31l31cav1eh3ap1cbiq35ea7t7nag@4ax.com>,
admin@snoman.com says...
> I have read in the past about using 4.0 head on a 258 and it is not a
[snip]
This is a public service announcement.
Archived examples of SnoMan's post below.
Please take the time read these.
They just may save you time, money, and your life in the future.
__________________________________________________ _________
SBJ: 4T65E
http://tinyurl.com/2lcjkv
(Confuses a 4T65e with a 4L65e and won't admit it.)
__________________________________________________ _________
SBJ: Dumb brake question
http://tinyurl.com/2ya3wo
(Discribes the wrong brakes and won't admit it.)
__________________________________________________ _________
SBJ: Front wheel bearings-2000 Blazer??
http://tinyurl.com/2j44zv
(Claims torque specs are wrong when they are not.)
__________________________________________________ _________
SBJ: Snoball Defense System v1.01
http://tinyurl.com/2okyfx
(Snoball breaks these out when he knows he's wrong
and doesn't want to admit it.)
__________________________________________________ _________
admin@snoman.com says...
> I have read in the past about using 4.0 head on a 258 and it is not a
[snip]
This is a public service announcement.
Archived examples of SnoMan's post below.
Please take the time read these.
They just may save you time, money, and your life in the future.
__________________________________________________ _________
SBJ: 4T65E
http://tinyurl.com/2lcjkv
(Confuses a 4T65e with a 4L65e and won't admit it.)
__________________________________________________ _________
SBJ: Dumb brake question
http://tinyurl.com/2ya3wo
(Discribes the wrong brakes and won't admit it.)
__________________________________________________ _________
SBJ: Front wheel bearings-2000 Blazer??
http://tinyurl.com/2j44zv
(Claims torque specs are wrong when they are not.)
__________________________________________________ _________
SBJ: Snoball Defense System v1.01
http://tinyurl.com/2okyfx
(Snoball breaks these out when he knows he's wrong
and doesn't want to admit it.)
__________________________________________________ _________
Guest
Posts: n/a
Re: Re: 4.0L Head Conversion for the 258
In article <i6t8j31l31cav1eh3ap1cbiq35ea7t7nag@4ax.com>,
admin@snoman.com says...
> I have read in the past about using 4.0 head on a 258 and it is not a
[snip]
This is a public service announcement.
Archived examples of SnoMan's post below.
Please take the time read these.
They just may save you time, money, and your life in the future.
__________________________________________________ _________
SBJ: 4T65E
http://tinyurl.com/2lcjkv
(Confuses a 4T65e with a 4L65e and won't admit it.)
__________________________________________________ _________
SBJ: Dumb brake question
http://tinyurl.com/2ya3wo
(Discribes the wrong brakes and won't admit it.)
__________________________________________________ _________
SBJ: Front wheel bearings-2000 Blazer??
http://tinyurl.com/2j44zv
(Claims torque specs are wrong when they are not.)
__________________________________________________ _________
SBJ: Snoball Defense System v1.01
http://tinyurl.com/2okyfx
(Snoball breaks these out when he knows he's wrong
and doesn't want to admit it.)
__________________________________________________ _________
admin@snoman.com says...
> I have read in the past about using 4.0 head on a 258 and it is not a
[snip]
This is a public service announcement.
Archived examples of SnoMan's post below.
Please take the time read these.
They just may save you time, money, and your life in the future.
__________________________________________________ _________
SBJ: 4T65E
http://tinyurl.com/2lcjkv
(Confuses a 4T65e with a 4L65e and won't admit it.)
__________________________________________________ _________
SBJ: Dumb brake question
http://tinyurl.com/2ya3wo
(Discribes the wrong brakes and won't admit it.)
__________________________________________________ _________
SBJ: Front wheel bearings-2000 Blazer??
http://tinyurl.com/2j44zv
(Claims torque specs are wrong when they are not.)
__________________________________________________ _________
SBJ: Snoball Defense System v1.01
http://tinyurl.com/2okyfx
(Snoball breaks these out when he knows he's wrong
and doesn't want to admit it.)
__________________________________________________ _________
Guest
Posts: n/a
Re: Re: 4.0L Head Conversion for the 258
In article <i6t8j31l31cav1eh3ap1cbiq35ea7t7nag@4ax.com>,
admin@snoman.com says...
> I have read in the past about using 4.0 head on a 258 and it is not a
[snip]
This is a public service announcement.
Archived examples of SnoMan's post below.
Please take the time read these.
They just may save you time, money, and your life in the future.
__________________________________________________ _________
SBJ: 4T65E
http://tinyurl.com/2lcjkv
(Confuses a 4T65e with a 4L65e and won't admit it.)
__________________________________________________ _________
SBJ: Dumb brake question
http://tinyurl.com/2ya3wo
(Discribes the wrong brakes and won't admit it.)
__________________________________________________ _________
SBJ: Front wheel bearings-2000 Blazer??
http://tinyurl.com/2j44zv
(Claims torque specs are wrong when they are not.)
__________________________________________________ _________
SBJ: Snoball Defense System v1.01
http://tinyurl.com/2okyfx
(Snoball breaks these out when he knows he's wrong
and doesn't want to admit it.)
__________________________________________________ _________
admin@snoman.com says...
> I have read in the past about using 4.0 head on a 258 and it is not a
[snip]
This is a public service announcement.
Archived examples of SnoMan's post below.
Please take the time read these.
They just may save you time, money, and your life in the future.
__________________________________________________ _________
SBJ: 4T65E
http://tinyurl.com/2lcjkv
(Confuses a 4T65e with a 4L65e and won't admit it.)
__________________________________________________ _________
SBJ: Dumb brake question
http://tinyurl.com/2ya3wo
(Discribes the wrong brakes and won't admit it.)
__________________________________________________ _________
SBJ: Front wheel bearings-2000 Blazer??
http://tinyurl.com/2j44zv
(Claims torque specs are wrong when they are not.)
__________________________________________________ _________
SBJ: Snoball Defense System v1.01
http://tinyurl.com/2okyfx
(Snoball breaks these out when he knows he's wrong
and doesn't want to admit it.)
__________________________________________________ _________
Guest
Posts: n/a
Re: Re: Re: 4.0L Head Conversion for the 258
On Fri, 9 Nov 2007 13:47:38 -0500, Heatwave <m3lt1ng5n0wmen@wah00.com>
wrote:
>This is a public service announcement - Troll on the loose!!!
This guy does not care if you find a answer or to even help you as he
is driven by his own insecurity to lash out at others that refuse to
bow to his inmaturity. He is digging his own newsgroup grave not mine.
-----------------
TheSnoMan.com
wrote:
>This is a public service announcement - Troll on the loose!!!
This guy does not care if you find a answer or to even help you as he
is driven by his own insecurity to lash out at others that refuse to
bow to his inmaturity. He is digging his own newsgroup grave not mine.
-----------------
TheSnoMan.com
Guest
Posts: n/a
Re: Re: Re: 4.0L Head Conversion for the 258
On Fri, 9 Nov 2007 13:47:38 -0500, Heatwave <m3lt1ng5n0wmen@wah00.com>
wrote:
>This is a public service announcement - Troll on the loose!!!
This guy does not care if you find a answer or to even help you as he
is driven by his own insecurity to lash out at others that refuse to
bow to his inmaturity. He is digging his own newsgroup grave not mine.
-----------------
TheSnoMan.com
wrote:
>This is a public service announcement - Troll on the loose!!!
This guy does not care if you find a answer or to even help you as he
is driven by his own insecurity to lash out at others that refuse to
bow to his inmaturity. He is digging his own newsgroup grave not mine.
-----------------
TheSnoMan.com
Guest
Posts: n/a
Re: Re: Re: 4.0L Head Conversion for the 258
On Fri, 9 Nov 2007 13:47:38 -0500, Heatwave <m3lt1ng5n0wmen@wah00.com>
wrote:
>This is a public service announcement - Troll on the loose!!!
This guy does not care if you find a answer or to even help you as he
is driven by his own insecurity to lash out at others that refuse to
bow to his inmaturity. He is digging his own newsgroup grave not mine.
-----------------
TheSnoMan.com
wrote:
>This is a public service announcement - Troll on the loose!!!
This guy does not care if you find a answer or to even help you as he
is driven by his own insecurity to lash out at others that refuse to
bow to his inmaturity. He is digging his own newsgroup grave not mine.
-----------------
TheSnoMan.com
Guest
Posts: n/a
Re: Re: 4.0L Head Conversion for the 258
So now you admit you lied, and didn't use the 4.0L head, in which you
said you use the 4.2 intake gaskets:
http://www.----------.com/temp/bill_is_wrong.jpg
God Bless America, Bill O|||||||O
mailto:--------------------
"SnoMan" <admin@snoman.com> wrote in message
news:i6t8j31l31cav1eh3ap1cbiq35ea7t7nag@4ax.com...
>
>
> I have read in the past about using 4.0 head on a 258 and it is not a
> bad idea. A quick search to refresh my memory revealed a article over
> in Geocities of such a conversion complete with pic's! It will give
> you more HP than stock head and more torque than a 4.0 because of
> increase displacement even if you do not stock it more. Again I would
> say I think is is a very worthwhile mod.
>
> http://www.geocities.com/035jeep/40L.html
> -----------------
> TheSnoMan.com
--
Posted via a free Usenet account from http://www.teranews.com
said you use the 4.2 intake gaskets:
http://www.----------.com/temp/bill_is_wrong.jpg
God Bless America, Bill O|||||||O
mailto:--------------------
"SnoMan" <admin@snoman.com> wrote in message
news:i6t8j31l31cav1eh3ap1cbiq35ea7t7nag@4ax.com...
>
>
> I have read in the past about using 4.0 head on a 258 and it is not a
> bad idea. A quick search to refresh my memory revealed a article over
> in Geocities of such a conversion complete with pic's! It will give
> you more HP than stock head and more torque than a 4.0 because of
> increase displacement even if you do not stock it more. Again I would
> say I think is is a very worthwhile mod.
>
> http://www.geocities.com/035jeep/40L.html
> -----------------
> TheSnoMan.com
--
Posted via a free Usenet account from http://www.teranews.com
