Mahle Forged Powerpak Pistons, Pins, Locks and Rings. GM LS Series 1/2/6 engines with cathedral port heads. Make: Chevy Engine: 408 GM LS/Bore 4.030″ Stroke 4.000″/ Rod Length 6.125″/Crown Volume -12.0cc Dish (2V)/Compression Height: 1.105″/ Weight 421g/ Compression Ratio 10.8:1w65cc/ Pin Diameter.927″Pin/Piston Material Forged 4032 Alloy/Ring Lands 1.0, 1.0, 2.0mm file fit rings/Skirt Type Grafal/Phosphate-Coated Skirt Quantity/ Sold As Kit (for 8 Cylinder). Applications 600hp street, strip, mild nitrous and forced induction. These are a special order item. Please e-mail with questions and availability.