Re: 4.0 Head on a 258

["Brien Tourville" <hh7x@xxxxxxxxxxx>]

You might look at the Harland Sharp roller rocker
arms that were designed just for the 258 / 4.0
and are reletively inexpensive.

Development was undertaken by an AMC fan 
/ racer / engineer and Harland Sharp.

Less wear on valve guides & less heat generated.


Brien.
NEW YORK
eagle registry #501
eagle kammback registry




From: Todd Tomason <jayscore@xxxxxxxxxxxxx>
Subject: Re: 4.0 Head on a 258


Fran,

Did you mean www.amcforums.com?  I went over there and signed up 
to
see what you said, and apparently Branden accidentally wiped all the
messages about an hour ago when an upgrade failed.  Would you mind
reposting it here?

I recently purchased a 4.0 cylinder head from Clearwater Cylinder
Heads that's supposed to have had the appropriate holes already welded
up.  This a  rebuilt head with the appropriate valve work, etc.
already done on it. 


I guess my biggest question is where do I still use 258 parts, and
where do I use 4.0 parts?  For example, I assume I can use stock 4.0
rockers. My 258 is an 83 that is in a Spirit.  

I'm also thinking that this is a good time to replace the timing
chain.  I heard somewhere that you can use a 4.0 timing cover on the
258.  True? It's supposed to have a cam button.  

Keep in mind that this is all pretty new to me.  I only did my first
intake a couple of months ago.  I've never head a head off of an
engine before.  

Todd

On Friday 06 May 2005 13:00, farna@xxxxxxx wrote:
> Did you post over at www.amcforums.net? If so I left an answer. I'll
> post a short version here.
>
> Tim's site is great! The only physical concern is the wash-out holes
> on the right edge of the head. They need to be plugged. Easiest DIY
> way is to pack the holes with water soluble packing peanuts and
> epoxy (need 1/16" epoxy, minimum) then let it cure for 24 hours.
> Next best is to drill the holes out to 3/4" and pop in 3/4" welch
> plugs (freeze plugs) with a little sealer on the edges. You could
> thread for flush pipe plugs, but that's goin overboard! Lastly the
> holes can be welded, but not recommended unless you're a good
> welder.
>
> The 4.0L head (and block) is slightly wider than the older
> counterparts. The 4.0L head gasket blocks these holes, they are to
> close to the edge ofthe block when the head's on the older block.
>
> On May 5, 2005 Todd Tomason wrote:
> > Anyone have any good information on adapting a 4.0 cylinder 
head
> > to a 258?  I found an article by Tim Weaver on the web.  Are there
> > other sites I'm not finding?
> >
> > Thanks,
> >
> >
> > Todd