598 CID Big Block Chevy high performance crate engine featuring a new Dart™ Big M block. This shortblock crate engine is supplied with bearings, crank, pistons and rods. These blocks are machined and assembled to exact tolerances with the highest quality parts.
This Pro Star™ 598 Big Block Chevy shortblock is supplied with 2618 forged pistons, 4340 H-Beam rods and a Scat 4340 forged crank.
Dart™ Big M blocks have many features that make them superior to their competition including a priority main oiling system, siamese cylinder bores with extra-thick walls and a variety of other benefits (see the Block section for more details). These new Dart™ blocks are the obvious choice for serious performance and durability.