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The Mahle MS piston set for Ford 489ci is specified with a 4.25in–4.28in bore range, a 4.250in stroke and 6.700in rod, using a 0.990in pin and a -9cc dish to produce about a 12.1:1 compression ratio. Supplied as a set of eight, these pistons are dimensioned for the 489ci configuration noted in the product details and intended for engine builds matching those bore, stroke and rod specifications.
Mahle MS Piston Set Ford 489ci 4.25in Bore 4.250in Stroke 6.7in Rod 0.990 Pin -9cc 12.1 CR Set of 8
