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Discussion Starter #41
If you want the head gasket to seal, use the OEM gasket and don't worry about the increase in CR from the head milling. The head gasket joint is highly-engineered. Anyway the sight increase in CR will yield a slight increase in performance. Also, make sure the machine shop has experience with the Toyota head because the 1zz does not have valve seat inserts. The seats are laser-clad and I seriously recommend not allowing them to machine the head for inserts. Anyway, the seat material is really tough and probably will be fine with just lapping. I also would not change guides if they are not worn. Make sure you follow the head bolt tightening procedure in the shop manual very carefully when reinstalling.
about 50% of the valve guides show leaking oil. I've talked about the valve seats to them. If the guides weren't bad I would have just lapped them myself.
 

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about 50% of the valve guides show leaking oil. I've talked about the valve seats to them. If the guides weren't bad I would have just lapped them myself.
Leaking oil could just mean worn-out valve guide seals. Guides might still be just fine. There are guide inspection specs in the shop manual.
 
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