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Blown head gasket 200 1981

In order to determine whether the head needs to be machined (likely) or if the deck needs to be machined (unlikely), you need a straight edge and a 'feeler guage'. I have forgotten the tolerance allowable across four cylinders, but it is only a few thousandths of an inch.

A head gasket that goes between an iron block and an iron head will likely last the life of the engine and it won't matter whether you use sealant. A gasket that goes between an iron block and an aluminum head has much tougher duty, and will only last few thousand cycles (expect 10-15 years). Follow the instructions that come with the gasket with regard to sealants. When I used a sealant, I used spray-on Copper-Coat (or was it Kopper-Kote?) it has been many years since I did a head gasket.






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