Wiseco Pro Tru Forged Pistons, Pins, Locks and Rings. Gen 4 Big Block Chevy 427+30 over bore=433CID Make: Chevy Engine: 427 BBC/Bore 4.280 “/Stroke 3.76 “/ Rod Length 6 .135 “/Crown Volume +21cc Hollow Dome Closed Chamber head/Compression Height: 1.760″/ Compression Ratio 10.2:1 with 107cc head / Pin Diameter.990″with locks/Piston Material Forged 4032 Alloy/Ring Grooves 1/16″, 1/16”, 3/16″/ Rings package file fit /Top ductile plasma moly with barrel face/ 2nd cast iron phosphate taper face/oil flex vent standard tension/ Coated Skirt / Sold as kit for 8 Cylinder. Applications 600+hp N/A street, strip, mild nitrous and forced induction. Special order item 3-5 business days. Please e-mail with questions and availability.