KB Claimer Series Hypereutectic Piston 4.060" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 5.0 cc 1425014 They dimpled their tubes at

They dimpled their tubes at the port to make more room for the header bolts and they parallel ground their flanges to assure a tight seal

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KB Claimer Series Hypereutectic Piston 4.060" Bore 5/64 x 5/64 x 3/16" Ring Grooves - Minus 5.0 cc 1425014 They dimpled their tubes atProduct Description: Piston Claimer Series Hypereutectic 4. 060 in Bore 5 64 x 5 64 x 3 16 in Ring Grooves Minus 5. 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