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Thread: Next phase - Head work

  1. #1
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    Default Next phase - Head work

    I've been out collecting parts, looking for deals, and waiting for the cold season to pass. So the next thing to do to the CJ is a head swap. The CJ still has good power, but the old intake/exhaust manifolds need lovin' that I'm not going to give. With exhaust leaks from that area, it's unexceptable from a noise/popping level, plus I get to add some (propossed) HP/TQ .

    I found a '94 ZJ head #7120 at a local pul-a-part, and it has the kwel factory header (with the accordion pipe on #1 & 6 exhaust ports). I've cleaned it up, and I'm ready to put it back to work.

    This might take a little while, so I'll start with a few teaser photos, and we'll go from there.



    Later, T.J.

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    Here's some more pics;

    The internals seem very clean for an engine with 140K (PO isn't sure if a rebuild was done earlier)


    Pondering WTF did I just get myself into....

    No cross-hone marks, but the tops of the pistons are carbon free, nice.

    Later, T.J.

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    Senior Member HillBillE's Avatar
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    Nice!! I like when the wrenching on the CJ is for good stuff, like HP/Torque, and just plain coolness of adding some newer ZJ parts under the hood!

    I don't care for the wrenching as much, when it's to fix a cracked block/blown motor with 10K miles on the rebuild.

    I envy you TJ! You are doiong the 'Fun Wrenching'!!


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    Quote Originally Posted by HillBillE View Post
    Nice!! I like when the wrenching on the CJ is for good stuff, like HP/Torque, and just plain coolness of adding some newer ZJ parts under the hood!

    I envy you TJ! You are doing the 'Fun Wrenching'!!
    Thanks for the , I'll probably need them.

    As for the fun wrenching, I'm all about it. Sometimes the wife will question me 'If I'm enjoying working on....?', this time I can say a resounding - YES!

    The head prep-work went unseen, and that isn't fun in the process, but to look back, I'm happy with the end result. All of the measurements worked out, and are within exceptable tolerances.

    Later, T.J.

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    After looking at tops of the pistons, I noticed 'TRW .040' stamped on them. So maybe that's why I have a good amount of power, PO rebuild.

    Onto the installation of the head,



    Notice that the intake ports are higher than the stock '79 ports, should be good air flow.


    Everything went like clock work. I made some guide rods from old head bolts, installed the head gasket, and slid the head over and on. The exhaust manifold/factory header is on, just need to tie up some loose ends on the intake manifold, and it'll be ready to bolt up.

    Later, T.J.

  6. #6
    Senior Member HillBillE's Avatar
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    I was going to ask what year that motor was (I see it's a '79)

    The head/valve cover design is a bit different on the plug side than the newer 258's.

    I'm hoping to find an older block like that, they are thicker/heavier than the newer ones, and not prone to cracking.

    .40 is nice! Mine is .30 over, and from what I've read (CJ rebuilders guide/CJ bible by Moses Ludel) you can go as much as .60 over.

    Although the guy who does my engine work suggested no more than .40 if possible.


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  7. #7
    Senior Member HillBillE's Avatar
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    BTW: I may go this route also. A little more top end would be nice!


    As long as the people remain armed,
    government knows that it cannot rule over the people by force.
    Those who stand in defiance of unconstitutional laws
    do so out of duty, honor, oath and love of country.


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    Did you plug the aPplicable holes in the head (water jacket)?
    http://zhvac.webs.com/

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    Quote Originally Posted by HillBillE View Post
    I'm hoping to find an older block like that, they are thicker/heavier than the newer ones, and not prone to cracking.

    Although the guy who does my engine work suggested no more than .40 if possible.
    If memory serves me correctly, (not enough java, yet - fillin' up as I type), '77 to '79 maybe '80 blocks use 1/2" head bolts, '81 to '88 or '89 use 7/16" head bolts, so if you find one of those older blocks you should be good to go.

    I'm happy that there's no more than .040. That means, if need be, I can go one more round.

    Later, T.J.

  10. #10
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    Quote Originally Posted by frankZ View Post
    Did you plug the aPplicable holes in the head (water jacket)?
    Yes, I used Quiksteel, right close to one tube. That was part of the not so fun head work, and I didn't take pics.

    Later, T.J.

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