Mahle Pistons 930239925 Forged Dome BB Chevy 4.625 Bore

Domes are compatible with popular 20° BBC cylinder heads and high lift, long duration cams. Dual coated and lateral gas ported. Focused attention on drag race-specific key stress areas. Mahle pistons were designed as a completely finished drop in forged piston assembly. Other than filling the included performance piston ring set, everything is done for you. Mahle has over 80 plus years of piston manufacturing making pistons from OEM to formula 1 racing. Mahle uses only the best technology to make these pistons. Mahle pistons come standard with anti-friction skirt coating for reduced drag. Forged from 4032 or 2618 aluminum alloys to suit specific needs for strength and durability. Forced Pin Oiler is used for increased wrist pin lubrication. Pin bores are CNC precision-machined. .990' High-Quality Steel Wrist Pin (145g), and Race Proven Round Wire Locks are included. Performance .043, .043, 3.0mm file-fit performance ring set not included.

Compression Ratio with 95cc Heads 16.9:1
Compression Ratio with 97cc Heads 16.5:1.
Note: Oil rail supports included. For Brodix BP SR-20 & BRX, Dart Pro 1 20°, etc.