KB Performance Pistons Hypereutectic Flat Top Piston and Ring Set - 4.040 in Bore - 5/64 x 5/64 x 3/16 in Ring Grooves - Minus 7.00 cc - Small Block Chevy CNX97102-X12 063" aluminum in two styles

063" aluminum in two styles for Holley(R) 5-1/8" and 7-5/16" Dominator carburetors

Easy installation with a set screw

COMP Cams Dual Valve Springs for race applications are manufactured from Super Clean wire and subject to extensive quality control testing to deliver a valve spring assembly with superior strength

Accurate and maintenance-free magnetic pick-up never needs adjustment

* SA105 uses a 4x6 fill plate

KB Performance Pistons Hypereutectic Flat Top Piston and Ring Set - 4.040 in Bore - 5/64 x 5/64 x 3/16 in Ring Grooves - Minus 7.00 cc - Small Block Chevy CNX97102-X12 063" aluminum in two stylesProduct Description: Piston and Rings Hypereutectic Flat Top 4. 040 in Bore 1. 433 in Compression Height 5 64 x 5 64 x 3 16 in Ring Grooves Minus 7. 00 cc Small Block Chevy Keith Black pistons have several important advantages over conventional alloy pistons. KB Hypereutectic Pistons high silicon content yields superior thermal and wear characteristics, greater strength, scuff and seizure protection, and resistance to cracking. High silicon content