Thread: chevy 400 what could cause this?

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Thanks 1stgencamaro! I am having my block prepped right now and I think it will be money well spent to have the block decked and then use a regular gasket. If the gasket is compressed to about 0.039"-0.040" I will talk over a deck height of 9.005" with my machinest/builder to get the quench with still a slight safery factor. As it shapes up now I will end up with about 9.9:1 with flat top eybrow pistons, but it looks like I will still have to use 91-92 octane. For streets, our power was out for a day here due to some wind storms in this area, but I did want to compliment you on the earlier documentation you submitted on adjusting hydraulic valves, thats the kind of info I need and hoped for on the head sequence. I still have no answer on reliability of thin head gaskets and I wonder what thickness was used in the 400 engine discussed above. Until I learn more I am going to assume that ultrathin head gaskets may be more likely to leak than the usual one which compresses to about 0.040"?

P.S. in edit thanks for several comments on gaskets used.

Don Shillady
Retired Scientist/teen rooder