Mahle PowerPak Forged Flat Top Piston and Ring Set - 4.155 in Bore - 1.245 in Compression Height - 1.0 x 1.0 x 2.0 mm Ring Groove - Minus 6.50 cc - Small Block Ford 550-1631 Duration 312 / 325 WM485MD Size:Small (55) With Steam HolesSince 1989 EAS21974
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Ships within 48 hours · Estimated delivery Oct 1 - Oct 6