ProTru by Wiseco Dome Piston and Ring - Forged - 4.280" Bore - 1/16 x 1/16 x 3/16" Ring Grooves - Plus 21.0 cc - Big Block Chevy Torsion Clip Valve Opens Fully at 1

Valve Opens Fully at 1 PSI (Note: blowing through it will only partially release the hinge)

All of the circuits receive a heavy duty coating of Humi-Seal for protection against vibration and moisture

gasoline and most other chemicals associated with boats

0:1 AFR (Requires Wiring) 0-5V Output Ethanol values from 5

ProTru by Wiseco Dome Piston and Ring - Forged - 4.280" Bore - 1/16 x 1/16 x 3/16" Ring Grooves - Plus 21.0 cc - Big Block Chevy Torsion Clip Valve Opens Fully at 1Chevrolet Big BlockWiseco Pro Tru is a division of Wiseco specializing pistons and piston rings for price conscious engine builders. They offer complete kits to fit a wide range of engines. Manufactured by Wiseco Performance Products, ProTru Forged Pistons are affordable with features usually found only in more expensive pistons. Product Description: Piston and Ring Dome Forged 4. 280 in Bore 1 16 x 1 16 x 3 16 in Ring Grooves Plus 21. 00 cc Big Block