I believe what you're seeing are the freeze plugs.  One isn't actually
held by a screw ... those screws are there to allow draining the heads
of coolant.

Mike

David Kao wrote:
> I have a pair of used AMC heads pulled from a parts vanagon.
> I am about to begin to rebuild my 84's 1.9 WBXer with these two
> heads. I have a few questions about these heads before I put
> them on.
>
> The heads have two metal caps at the bottom side of them. If you
> look at the heads at their installed position the upper side has
> the intake and spark plug holes. The bottom side has the two metal
> caps, one is held in position by a screw and the other is in there
> by itself.
>
> Well, one the two AMC heads has one cap that is plugged up by
> some kind of epoxy that looked like aluminum. My guess is that the
> original cap leaked and it was repaired. Whoever did the repair
> used the epoxy to plug it up. I can not see if the original cap
> is still in there or not. It seems that it did the job before I
> pulled them off from the parts van. But I am really concerned if
> it will eventually develop a coolant leak that will require
> a tear down of the engine again.
>
> Any suggestions as to how to fix it correctly once for all? Is
> there such metal caps available from anywhere? How is it installed?
> This is the cap that is not held in position by a screw. Should
> I send it to a machine shop to get it re-capped?
>
> BTW, the pair of AMC heads look in very good shape. There is no
> crack, warpage or any visible sign of problems (except the cap).
> I have lapped all the valves and they seem all seal pretty well.
>
> Any help is appreciated.
>
> David
>
>
>
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