Top end 258 rebuild
 

I'd like to do the top end of my old 258 incl. hyd. lifters, push rods,
rocker arms, pivots, valves, guides, etc.

Has anyone done this w/o changing cam ? I know the experts always recommend
a cam change when doing lifters.

Re: Top end 258 rebuild
 

On Sun, 2 Dec 2007, Rod's SHAW wrote:

>
> I'd like to do the top end of my old 258 incl. hyd. lifters, push rods,
> rocker arms, pivots, valves, guides, etc.
>
> Has anyone done this w/o changing cam ? I know the experts always recommend
> a cam change when doing lifters.
>

I sent my head out to a shop to have the seals replaced, while it was
there I had the valve seats ground and they ran it through the planer to
check it for trueness. It wasn't a lot of money for the work.

What I _did_ find, though, was that the lobes of the cam were flaking of
along the edges. If you're going to be that deep in the engine you might
as well pull and inspect the cam and replace the timing chain.

Re: Top end 258 rebuild
 

On Sun, 2 Dec 2007, Rod's SHAW wrote:

>
> I'd like to do the top end of my old 258 incl. hyd. lifters, push rods,
> rocker arms, pivots, valves, guides, etc.
>
> Has anyone done this w/o changing cam ? I know the experts always recommend
> a cam change when doing lifters.
>

I sent my head out to a shop to have the seals replaced, while it was
there I had the valve seats ground and they ran it through the planer to
check it for trueness. It wasn't a lot of money for the work.

What I _did_ find, though, was that the lobes of the cam were flaking of
along the edges. If you're going to be that deep in the engine you might
as well pull and inspect the cam and replace the timing chain.

Re: Top end 258 rebuild
 

"Rod's SHAW" <rod.gram@shaw.ca> wrote in message
news:nyo4j.83661$cD.49764@pd7urf2no...
> I'd like to do the top end of my old 258 incl. hyd. lifters, push
rods,
> rocker arms, pivots, valves, guides, etc.
>
> Has anyone done this w/o changing cam ? I know the experts always
> recommend a cam change when doing lifters.
>
Even I recommend replacing the cam and the lifters as a set, and I am by
no means an expert. What you are proposing is like replacing a set of
Timken tapered bearings, while leaving the old worn out races in place.

Cheers,

Earle



--
Posted via a free Usenet account from http://www.teranews.com

Re: Top end 258 rebuild
 

"Rod's SHAW" <rod.gram@shaw.ca> wrote in message
news:nyo4j.83661$cD.49764@pd7urf2no...
> I'd like to do the top end of my old 258 incl. hyd. lifters, push
rods,
> rocker arms, pivots, valves, guides, etc.
>
> Has anyone done this w/o changing cam ? I know the experts always
> recommend a cam change when doing lifters.
>
Even I recommend replacing the cam and the lifters as a set, and I am by
no means an expert. What you are proposing is like replacing a set of
Timken tapered bearings, while leaving the old worn out races in place.

Cheers,

Earle



--
Posted via a free Usenet account from http://www.teranews.com

Re: Top end 258 rebuild
 

Earle Horton wrote:
> "Rod's SHAW" <rod.gram@shaw.ca> wrote in message
> news:nyo4j.83661$cD.49764@pd7urf2no...
>> I'd like to do the top end of my old 258 incl. hyd. lifters, push
> rods,
>> rocker arms, pivots, valves, guides, etc.
>>
>> Has anyone done this w/o changing cam ? I know the experts always
>> recommend a cam change when doing lifters.
>>
> Even I recommend replacing the cam and the lifters as a set, and I am by
> no means an expert. What you are proposing is like replacing a set of
> Timken tapered bearings, while leaving the old worn out races in place.
>
> Cheers,
>
> Earle
>

Actually, it is even worse than that. Any cam run with a set of lifters
develops a wear pattern for each cam lobe and lifter. It is a very good
possibility that replacing the lifters will result in accelerated cam
wear. I know some people get away with it, but it is definitely not
recommended unless the cam in question is a roller cam.

Chris

Re: Top end 258 rebuild
 

Earle Horton wrote:
> "Rod's SHAW" <rod.gram@shaw.ca> wrote in message
> news:nyo4j.83661$cD.49764@pd7urf2no...
>> I'd like to do the top end of my old 258 incl. hyd. lifters, push
> rods,
>> rocker arms, pivots, valves, guides, etc.
>>
>> Has anyone done this w/o changing cam ? I know the experts always
>> recommend a cam change when doing lifters.
>>
> Even I recommend replacing the cam and the lifters as a set, and I am by
> no means an expert. What you are proposing is like replacing a set of
> Timken tapered bearings, while leaving the old worn out races in place.
>
> Cheers,
>
> Earle
>

Actually, it is even worse than that. Any cam run with a set of lifters
develops a wear pattern for each cam lobe and lifter. It is a very good
possibility that replacing the lifters will result in accelerated cam
wear. I know some people get away with it, but it is definitely not
recommended unless the cam in question is a roller cam.

Chris

Re: Top end 258 rebuild
 

I think you should be prepared to replace the cam, and some would insist
that you must replace the cam, but I have another worm to crawl out of the
can ...

My recommendation is that you strongly consider replacing the head with a
4.0L head. The intake track on the 4.0 head is much better than that of the
258. The track is straighter and breathes much better.




"Rod's SHAW" <rod.gram@shaw.ca> wrote in message
news:nyo4j.83661$cD.49764@pd7urf2no...
> I'd like to do the top end of my old 258 incl. hyd. lifters, push rods,
> rocker arms, pivots, valves, guides, etc.
>
> Has anyone done this w/o changing cam ? I know the experts always
> recommend a cam change when doing lifters.
>
>
>

Re: Top end 258 rebuild
 

I think you should be prepared to replace the cam, and some would insist
that you must replace the cam, but I have another worm to crawl out of the
can ...

My recommendation is that you strongly consider replacing the head with a
4.0L head. The intake track on the 4.0 head is much better than that of the
258. The track is straighter and breathes much better.




"Rod's SHAW" <rod.gram@shaw.ca> wrote in message
news:nyo4j.83661$cD.49764@pd7urf2no...
> I'd like to do the top end of my old 258 incl. hyd. lifters, push rods,
> rocker arms, pivots, valves, guides, etc.
>
> Has anyone done this w/o changing cam ? I know the experts always
> recommend a cam change when doing lifters.
>
>
>

Re: Top end 258 rebuild
 

Damn Jeff, you beat me to it.
Do a thorough search here and on the magazines websites. You will find lots
of instructions on putting the 4.0 head on in place of your original. Much
better head design. ITs about as common as dropping in a ford 8.8 into a YJ.
I think it involves plugging a couple of water jacket holes, but no big deal
other than that. Also, the cam isn't that much farther in with the heads off,
go for it, and put a nice towing grind in there and you'll be glad you did.
Just remove the radiator, timing cover and gears/w/chain, and you can pull
the cam out.

Jeff Strickland wrote:
>I think you should be prepared to replace the cam, and some would insist
>that you must replace the cam, but I have another worm to crawl out of the
>can ...
>
>My recommendation is that you strongly consider replacing the head with a
>4.0L head. The intake track on the 4.0 head is much better than that of the
>258. The track is straighter and breathes much better.
>
>> I'd like to do the top end of my old 258 incl. hyd. lifters, push rods,
>> rocker arms, pivots, valves, guides, etc.
>>
>> Has anyone done this w/o changing cam ? I know the experts always
>> recommend a cam change when doing lifters.

--
Message posted via http://www.carkb.com