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The Mahle MS piston set for BBC 489ci applications is an eight‑piston kit sized at a 4.280in bore and 4.25in stroke with a .990in wrist pin. With 6.385in rods and a 43.0cc crown volume, these pistons yield about a 12.9:1 compression ratio in the extended spec. They are intended for big‑block Chevrolet builds needing specific piston crown volume and dimensional accuracy.
Mahle MS Piston Set BBC 489ci 4.280in Bore 4.25in Stroke 6.385in Rod .990 Pin 43cc 12.8 CR Set of 8
