Hello all, I'm new on here, and I know the 239 isn't the best version of the Y blocks to be modifying. But I am building a 239 stroker utilizing a 312 crank that I got at a local auction for what would be considered a steal as it was just reground and came with bearings. Although the main bearings will be of no use.

I have figured out that with the 312 crank and stock length 239 rods that the 144 6 cylinder pistons are the correct compression height for the combo. It will end up being about 270cid depending on the overbore.

This is a 1954 239 truck engine, and the cam has the 14 teeth if I'm remembering correctly.