Quote:

Mind your Ps and Qs. If I can remember correctly a block bore size can be 70th over stock in Super Stock. Can not remember the crank but it is something like 3.85. Wish I had an old NHRA book to study again. Going only by my memory and it is getting older and older, and I will type this like a question. Did Chrysler not put different letters on the side of the blocks to signify what piston went into each bore when assembling a Hemi at the factory. I thought I remember BCDEF piston sizes. So the Ps and Qs would be for another type of Chrysler description of a bore size of a Hemi Block.




NHRA allows OEM stroke plus .015, or 3.75 + .015 = 3.765.

The extra .015 gives about 1.75 cu in. Every bit helps in SS.