Big Inch Smallblock

I remember the old rule of thumb for most was 3,500 fpm for stock type cast crank and rods which is 5850 rpm with 3.58", 6350 rpm with 3.31" and 4500 fpm with good aftermarket parts. Which seems a little outdated/conservative.




Nascar does 5100 rpm and Pro Stock is hitting 6300 fpm.

Fpm x 6 / stroke = rpm.