KB Hypereutectic Piston 4.000" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 7.0 cc 21300XR-O Knowing the exact air/fuel mixture

Knowing the exact air/fuel mixture running through your engine is the most important factor to extracting the highest levels of performance and durability

Fits rear 5 feet of cargo area

This allows a tighter lap belt and it will load more quickly in the event of an impact

Cross Flags

KB Hypereutectic Piston 4.000" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 7.0 cc 21300XR-O Knowing the exact air/fuel mixtureProduct Description: Piston KB Series Hypereutectic 4. 000 in Bore 5 64 x 5 64 x 3 16 in Ring Grooves Minus 7. 00 cc Small Block Chevy Set of 8 Created from a high silicon aluminum alloy, KB Performance pistons are lightweight to improve throttle response and RPM changes while still being strong enough to withstand high compression and high temperatures. Each piston is engineered with race ready features like high upper compression ring locations, gas