Wiseco Pro Tru Forged Pistons, Pins, Locks and Rings. Gen 1 SBC 377CID (+30 over bore) destroked 400 Make: Chevy Engine: 400 SBC/Bore 4.155 “/Stroke 3.48 “/ Rod Length 5.700 “/Crown Volume -5.0cc Flat (2V)/Compression Height: 1.560″/ Compression Ratio 10.8:1 w64cc head / Pin Diameter.927″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.