Originally Posted by southernculture
the gap from the top of the piston is .024 to the top of the block. I am the engine assembler. I have not changed the rear gear yet but was planning on a 3.07. The trans I have now is a saginaw 3 speed. I plan on getting a m21. but that is much later. I would rather have rough idle and more power than perfect drive ability it is a rat rod. I am fine with running it higher in rpms, I will be running roller rockers and upgraded pushrods. I dont have a head gasket yet so that gap is still open to arguement, when I did the calculation on the cr it was with a .40 head gasket. I will run pump gas!
DO NOT USE A .040" GASKET! The .015" spec'ed will be the best match for your combo.