SRP Forged 23*Pistons, Pins, Locks SBC 383 CID Make: Chevy Engine: 383 SBC/Bore 4.030″ Stroke 3.750″/ Rod Length 6.000″/Crown Volume -5.cc Flat Top (2V)/Compression Height: 1.125″/ Weight 416g/ Compression Ratio 10.5:1w64cc/ Pin Diameter.927″- 2.750″ length/ Spiro locks included /Piston Material Forged 4032 Alloy/Ring Lands 1/16″, 1/16″, 3/16″/ Pistons Rings Not Included / Sold As Kit (for 8 Cylinder). Applications 500-600 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.