Details
Dart engineered the Big M to be the strongest, most reliable, and easiest to build big-block on the market. The 4 bolt splayed caps available, in ductile iron and steel, and the thick main webs make the bottom end the Strongest in the Industry. We redesigned the lubrication system to create a true priority main system that oils all of the main bearings before the lifters for extra reliability. Our stepped main oil gallery (9/16in to 1/2in to 7/16in) increases the flow of oil to the crank at high rpm, and our front oil crossover eliminates internal oil leaks around the distributor shaft. The result: more oil at the bearings and pushrods where its needed, and less power-robbing crankcase windage.
We added two slotted head stud bosses on both sides of the lifter valley so you can use studs instead of hard-to-install bolts to take the place of the missing head bolts. SEE BELOW to order Inner Head Stud Kit
Dart machines Big M blocks in-house on precision CNC equipment to ensure quality and to eliminate the need for expensive blueprinting.
- 9.800 deck
- 4.600 bore (4.592 unfinished to allow honing)
- Billet Steel main caps
- For 2pc rear seal
- Mains are finish honed
- Decks are +/- .002
- Cam bore is finish honed
- Lifter bores are honed (always check clearance)
- 4 bolt main caps - center 3 are splayed
- Mechanical Fuel Pump provision
- Uses +.300 tall lifters (GEN VI style)
- Oil filter pad is drilled & tapped for an external oil pump
- Blind head bolt holes do not go through to water
For BLOCK with ROTATING ASSEMBLY click here
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Additional Information
| Manufacturer | Dart |
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