gusto Posted January 26, 2020 Report Posted January 26, 2020 (edited) A 392 is a 68mm bore on a stock crank a 421 is a 68mm bore on a 4 mil (stroker) crank a stroker crank on stock cylinders are called 4 mil stroker (or stocker) and the cc will change on the bore the 392 and 421 are most commonly made by CP Industries (cubs and servals) and by Driveline (assassins). They are nicasil coated Edited January 26, 2020 by gusto 2 Quote
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