555 CID Big Block engine featuring a new Dart™ Big M block. The Complete & Dyno'd build level comes fully dressed with timing cover, oil pan, Pro Star polished aluminum valve covers, harmonic balancer, intake, carburetor, distributor, spark plugs and wires. For this build level we test each engine on our own in house dynamometer; you get the dyno sheet from the actual engine sold to you. These blocks are machined and assembled to exact tolerances with the highest quality parts.
This Pro Star™ 555 crate engine is supplied with 2618 forged pistons, 4340 H-Beam rods and a Scat 4340 forged crankshaft.
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.