GM Performance 19434598 LS3 CT525 533HP Crate EngineLS3 CT525 Crate Engine LS3 533HP Crate Engine 376 Cubic Inch 533 HP GM LS Series HIGH RPM PERFORMANCE WITH NEW FORGED PISTONS! Chevrolet Performances deep breathing, high revving CT525 6. 2L crate engine is upgraded with forged pistons designed to support its performance and enhance its durability. The CT525 is based on the LS engine family and is similar to the 6. 2L LS3, but weve adapted it to circle track racing with a carbureted intake manifold, 6