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The Mahle MS piston set for BBC 489ci engines includes eight pistons sized to a 4.280in bore and 4.25in stroke with a .990in wrist pin. Paired with 6.385in rods and a small negative crown volume near -3.4cc, these pistons yield about an 8.7:1 compression ratio per the extended spec. This kit is intended for accurate big‑block Chevy rebuilds requiring matched piston geometry.
Mahle MS Piston Set BBC 489ci 4.280in Bore 4.25in Stroke 6.385in Rod 0.990 Pin -3cc 8.6 CR Set of 8
