All small blocks share same crank ?

pearljam724 said

Thanks guys. I’ve been chasing a driveline vibration at 70mph. Addressed many things to no avail. Only thing I haven’t addressed yet. Is driveshaft balance and tranny mount. Which I ll do both soon. If that’s not it. The crank may be bent or out of balance. That’s the only other option left I see. But, nothing vibrates when car is in motion under 70. Does anyone sell a 360 crank new for a 72 engine ?

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I doubt the crank is "bent." You need to detail THE REST of your combo. What are you running for transmission? If this is a stick IT MUST use a weighted flywheel to "balance" the 360 crank, needs external weighting. Likewise you must have a 360 weighted balancer

If you have a conventional torqueflite (and not the newer OD trans) the converter MUST have weighting welded to the front face same purpose as a stick flywheel.

Have you been able to determine if it vibrates in park or neutral at the same RPM range as you feel at speed? That will quickly tell you if it's an engine/ balance/ transmission problem, or something else in the drive train.

And don't discount wheels/ tires out of true/ out of balance, BOTH FRONT AND REAR