Originally posted by Dave Severson
At 20 lbs of boost, I would be looking for a 4 bolt block.
Ya know Hopper, the older you get, the more cautious you'll become. I'm pretty sure that ...ALL... the old guys on here would start with a 4-bolt block, steel crank and forged pistons if they were going to hang a huffer on a motor, no matter what boost they had in mind presently. Once you get the taste of a blower, you'll want to add more boost and more boost and if you start with the correct components, you won't have to unscrew the motor and do it over.