These will accept V-8 rods, although vibrations induced by the odd-fire cranks' uneven firing impulses create considerable vibration on street-driven vehicles (that's not a concern on a race car). However, most aftermarket forged or billet race cranks use odd-fire cranks with common-pin (nonoffset) crankshaft rod journals. V-8 rods and bearings won't work on a production V6-90 even-fire crank. Due to the journal offset, V6-90 rods as viewed from the side are narrower than V-8 rods, as are the rod-bearing inserts. Achieving even firing pulses in a V-6 engine with a 90-degree cylinder-bank angle required GM to offset the connecting-rod throws 30 degrees to produce 120 degrees of crankshaft rotation between cylinder firings. A production 4.3L V6-90 is a true even-fire engine.
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