[6pack] Crankshaft Interchangability?

[Bruce Simms]

Are crankshafts interchangable, or, must you match crankshafts to engine
no. series?  Are the short back cross drilled crankshafts from the PIs more
desirable from a performance perspective, or, does it make any difference?
Thank you,

Bruce Simms
73 TR6
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