Mahle Pistons 930261690 Forged Flat Top BB Ford 4.390 Bore

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 low expansion aluminum alloy for high strength and reduced piston to wall clearance. Forced Pin Oiler is used for increased wrist pin lubrication. Pin bores are CNC precision-machined. .990" High-Quality Steel Wrist Pin (145g), Performance 1.5, 1.5, 3.0mm file-fit performance ring set, and Race Proven Round Wire Locks are included.

Compression Ratio with 72cc Heads 13.5:1.
Compression Ratio with 80cc Heads 12.4:1.
***Replaces part number BBF350390F03***