1972 350 Chevrolet Pickup Engine - Tech - Build Your First Engine
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Even though we'd be replacing the pistons, we could learn more about the condition of the block by examining the existing piston-to-wall clearance. With its cast-aluminum pistons inverted and inserted (minus rings), we measured 0.0015 inch skirt clearance. This is well within spec and helped us determine that the bores were round and the engine hadn't experienced massive detonation, which can collapse the outwardly tapered skirts and increase the measured clearance. Keep in mind that cast, hypereutectic, and forged pistons all have different clearance settings, from 0.0015 to 0.015 inch. This was still the inspection stage, and our main concern was to see consistent readings from cylinder to cylinder. View Related Article
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