Engineered for applications where water between the bores is a requirement. Siamese bore versions are also available for larger bore applications.

MRK IV blocks use the 2-piece rear seal design, and Gen V and Gen VI blocks use a 1-piece rear seal as well as a different timing cover pattern.

These blocks are based on Dart’s Big M design, and include features like priority main oiling and 4-bolt main caps.

• 10.200” deck height.

• 4.500 Bore.

• Uses +.300” tall Gen VI style lifters.

• 4-bolt main bearing caps in steel billet have splayed outer bolts for extra strength.

• Lifter valley bosses for OE style roller lifters and retainer.

• Mechanical fuel pump boss, clutch linkage mounts, and side and front motor mounts simplify installation in any chassis.

• Parts kit sold separately (PN 32000002)

We also carry most other Dart Blocks in different sizes and configurations as well as new & used cylinder heads, cranks, rods, pistons, intakes, carbs, oil pans and much more. Call or message us with your needs.

Freight: 

All blocks are shipped via freight truck service.