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when I find them pluged with carbon and doing a home VJ on them. I run a drill bit in a 1/2" or so, then fill them with the Copper RTV or JBWeld.

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I was wondering about JBweld as opposed to tapping them and using a set screw. Any problems with the JB weld not holding up over time?

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"leak just a little"
That's a can of worms!

Sure, go ahead and lap but if after 20 or so seconds if you don't get good contact patterns on each side they need more attention.

Keep in mind that as valves heat and expand more than the heads, the lapped areas will probably not be in contact with each other any more.

The holes are for AIR injection. Mopar ran the air into a separate passage in the exhaust manifold, then into the head exhaust ports through those holes. I drilled them out, tapped for 1/4-20 threads, then screwed in some junk screws and cut off the heads. Done. Use thread locker? Hardly necessary. But when threading, use plenty of lubricant. I managed to break off a tap in one of the holes. That one I plugged from the inside with some goop I had around.

Seeing how easily they plug with carbon I am sure just filling them with JBWeld would suffice in blocking them off.

R.

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I would take that 430$ and get a used engine with a 90 day warranty.

rolling the dice you have crapped out with mag heads,looking at worn heads,waiting on old heads.

I bring a JY engines home,strip and clean them,change all gaskets exept head gaskets,3 cans of plasticoat hemi orange and they look new.

300$ for a 91 318,I just swaped in my lunati roller cam/comp 901 spring with heads on engine.

picked up another 88 roller cam 318 for 300$ used with 90 day warranty.fixin to pop a roller whiplash in this one and let it rip rollin the dice for 800$

less time & $$$ in the long run with lots more fun wearing/breaking used junk along the way for me.

even the 440 in my sig pic was a 300$ engine I built the truck around,70,000 miles on the clock and runs great.

give you local JY a call while you wait and see what they have on the cheap.

I feel your pain with all that has gone wrong on your project latly.

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Thanks scratchin' I have learned a lot from trying to do this magnum build. The heads are currently stripped in the scrap pile. Now that I know what to look for, the seats were pitted, worn to one side and possibly cracked. The machine shop didn't think it would be worth it to try to redo....and I agree.

So now I have 3 sets of LA 318 heads I can work with. The short block is fresh and ready to roll. I have all the parts except for worry free cylinder heads.

Now, if the motor runs like crap with new heads, I just may scrap the whole stupid car!

This is all part of learning though, right?

Which reminds me...scratchin, you are close to clearwater cylinder head. What do you know about the work they do? Good, bad, avoid? It was their heads I was scoping out on ebay.

eightlitermopar