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Post by 401amx1969 on Nov 10, 2016 15:01:53 GMT -8
The problem on high boost is the gasket. With Cometic MLS head gasket, the embossment is very close to the water holes. Doesn't matter the bore size is, the embossment is alway at the same location. So if your deck and head surface is not perfectly straight, you will leak boost on the water valley and guest what! On one of my previous engine the deck was not bad, but at 25 psi, I burned couple pistons! Yes I don't run a 360, but my bore is only 4.125''.
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Post by ghinmi on Nov 10, 2016 19:36:50 GMT -8
I had very good luck with Fel Pro blues with the extra head stud on a 4.195 bore and iron heads. But I only went to 20 psi on that motor.
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