Designed for hard core racing, the Dart Iron Eagle Ford block addresses all the weakness of factory castings. Dart blocks are cast from premium, high strength iron with extra thick cylinder walls and decks. The main webs are beefed up and fitted with steel 4 bolt main caps for superior durability.

Every Dart block is individually qualified to ensure maximum thickness where you need it most, every time. Dart blocks are fully CNC machined and virtually ready to assemble with off the shelf components.

Features:
- Siamesed cylinders: Standard 4.000" or 4.125" cylinders can be safely bored to 4.185" diameter. Ductile iron sleeves and extra thick walls prevent cracking and produce excellent ring seal.

- Multiple deck heights allow for increased displacements of up to 468 cubic inches.

- Scalloped outer water jacket walls improve coolant flow around the cylinder barrels to prevent detonation, extend engine life and produce consistent cylinder temperatures.

- 4 bolt billet steel main caps. Three center caps have splayed outer bolts for extra strength; rear cap uses standard one piece seal.

- Two main bearing diameters 302 (2.249") or 351C (2.749") allow choice of small or large journal camshaft.

- Stock components make Dart blocks a direct replacement for most production small blocks. Provisions for stock motor mounts, accessory drives, smog pumps, starter brackets, oil pans and pumps.

- Upgraded oiling system has a complete stock type system plus a low restriction priority main oiling system with front and rear external oil pump feeds.

- Dual crossovers allow oil flow to be metered with restrictors for roller lifter cams and/or rocker roller arms to reduce oil flow and windage.

- Reinforced head bolt bosses are blind tapped to prevent leaks and produce accurate torque readings. Extra thick decks prevent head gasket leaks.

- Standard camshaft and camshaft drive can be used.

Block Prep Options
Dart blocks are optionally available fully finish prepped. If you choose to order your block this way you can specify a final lifter spec and a final hone spec. Your block will be finish machined to your specs, final prepped and washed, pipe plugs and freeze plugs will be installed, then it will be bagged and boxed. Your block will arrive finished and ready to use!

Block Prep Options
Dart blocks are optionally available fully finish prepped. If you choose to order your block this way you can specify a final lifter spec and a final hone spec. Your block will be finish machined to your specs, final prepped and washed, pipe plugs and freeze plugs will be installed, then it will be bagged and boxed. Your block will arrive finished and ready to use!