Subaru FA20 Turbo, Bore 86.0mm, Stroke 86.0mm, Rod Length 129.3mm, Dish -8cc, 320 Grams Advertised Weight, Set of 4 Pistons and Rings Included.

The Mahle PowerPak Plus pistons were designed as a completely finished drop-in 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 2618 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. 22mm High-Quality Steel Wrist Pin (123g), Performance 1.2, 1.2, 2.8mm performance ring set, steel nitrided top ring, and Race Proven Round Wire Locks are included.

Compression Ratio with 40cc Heads 10.5:1.