As Toby has stated I made an executive decision to switch this to a 572 from a 604. Toby wanted Steel rods(Oliver's)so I elected to use the shorter stroke. Adding a bunch of stroke takes away from the efficiency of the engine and with the heavier bob weight(steel rods)I figured the engine would be "happier" with the shorter stroke.

If you use the available formulas the Original B1 heads doesn't need or want a lot of cubic inches.

Heads are B1MC's 2.400/1.80, Comp Roller, Isky EZ roll lifters, Jesel Rockers/Belt drive, ATI dampner, wet sump and a Morosso vacuum pump making 12+". We used our standard wedge dyno headers: 2"x 32" w/3" collector so I'm sure there are a few HP with a bigger, shorter tube header. And YES, Q16 makes power! Especially on a combination like this that is somewhat airflow limited.