crank shaft and b1

i am planning on going up to 604 ci from 511 ci. what do u guys think of an ohio crankshaft 4.750 stroke product and also would like to know what head would be better 572-13 or b1 originals what flow number differences between both heads- also was told that with the b1 heads i would be able to go with a larger 4530 bore it has better sealing fit than the 572-13 - give me your input thanks

https://board.moparts.org/ubbthreads/show...e=1#Post6917188


Chris..

B1 heads, not Indy...

I built a 612 (4.530 x 4.750) in an Indy block with B-1 original heads 3 years ago. It lasted to about the 1000' mark on the first run and the cam broke! In conversation with another Mopar racer, he thought there might be a clearance problem with the rods and cam with a 4.75" stroke. Uhh ... maybe he has something there. Oh well it only cost me about $12,000 to find out. All I'm sayin' is you better check this out.
K.B.

Ouch! That is an interesting thought with the long stroke. Even if it clears fine on the engine stand, it might not clear at 7000 rpm when the crank starts to move around.

For the OP, I wouldn't use a bargain basement crank in a big power motor. Better spend the money for the good stuff if you want it to make power and live.

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Ouch! That is an interesting thought with the long stroke. Even if it clears fine on the engine stand, it might not clear at 7000 rpm when the crank starts to move around.

For the OP, I wouldn't use a bargain basement crank in a big power motor. Better spend the money for the good stuff if you want it to make power and live.

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I cracked an Ohio 4.15 large rod bearing crank at 100 passes. No detonation, or other problems. I now have a $2300 Crower in it. I could have saved myself a bunch of $$ had I done it right the first time. If it were me, I would stay at 4 5/8 stroke or less, Biggest heads I could afford.