SRP Professional 23 Degree FSR Forged Pistons, Pins, Locks and Rings. SBC 406 CID Make: Chevy Engine: 406 SBC/Bore 4.155″ Stroke 3.75″/ Rod Length 6.000″/Crown Volume -5.cc Flat Top (2V)/Compression Height: 1.125″/ Weight 405g/ Compression Ratio 11.6:1w64cc/ Pin Diameter.927″-2.250″/Piston Material Forged 4032 Alloy/Ring Lands 1.2, 1.5, 3.0mm non file fit Plasma moly rings standard oil tension/Anti-Friction Coated Skirt/ Sold As Kit (for 8 Cylinder). Applications 600+hp street, strip, mild nitrous and forced induction. These are a special order item 5-7 business days. Please e-mail with questions and availability.