390 Performance Expectations?
#16
Wow; your block must have been machined down quite a bit. The H304P pistons normally sit .030" down the hole. Even at .020" deck height; I doubt you have 10.5:1 CR with stock head gaskets.
#17
Apparently todays gas and that of the late 60's, early 70's is not quite the same as far as octane ratings go.
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