Doing A Valve Job

[INSIDIOUS '86]

I wouldn't suggest mixing new with old or used with unoriginal used. You can buy a single new lifter off summit which will will solve any lifter issues. When inspecting your old lifter it shouldn't have a recessed ring or any scraping marks otherwise those are signs the cam may be on the way out. Use a flashlight to look at the top of the came lobe. It should be smooth and shiny with no scuffing.

If all that checks out you can replace the lifter and pushrod. Now here's the lowdown on new lifters on old cams. They will either mate to each other and establish a matching wear pattern orrrr they will not mate and it will accelarate the wear rate of the cam. Camshafts are only surface hardened so depending on how worn that cam love is will determine the success of a new lifter repair so if its in good condition chances are it will all work out. But there's always a chance it may wipe the lobe. So when you do this add break in oil or zinc additive to help it succeed and run a cam break in procedure.

So now that section is good. Now focus on the valve and guide. Your mechanic can fix this without pulling the head which will save you a lot. You can put the #5 cylinder up to the top and fill it with nylon rope through the plug hole which will prevent the valve from dropping into the cylinder. The valve spring and retainers can be taken off and you can inspect the head and the guide and rotate the valve to check its straightness. If it checks out replace the guide seal and put it together and it should run fine.
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[LynnJr]

For the money and labor your putting in this set of heads have you considered buying a set ready to go?
It would solve all your current problems and you can build a short-block in your spare time as money allows and have your dream engine.
I won't recommend any particular head after the last debacle on this forum but click on this link and scroll down a page or two.;
http://www.ebay.com/sch/Cylinder-Hea...+heads&_sop=15