1972 350 Chevrolet Pickup Engine - Tech - Build Your First Engine
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The Powerhouse-supplied Hastings moly-faced piston rings (PN 2M 139 030) come pregapped at 0.016 inch. Just to confirm, we used an inverted piston as a squaring tool and installed each ring into the block so we could check the installed endgap with a feeler gauge, and it was spot-on. For naturally aspirated street/strip engines like this, you want 0.004 inch of ring endgap for every inch of cylinder bore (0.004 x 4.030 = 0.016). Nitrous and forced-induction applications require more endgap, as much as 0.006 inch per inch of cylinder bore, to ensure survival. View Related Article
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