With multiple deck heights and bore sizes up to 4.600", the Big M block gives you the versatility to build a wide variety of engine combinations. A true priority main oiling system oils the main bearings before the lifters for extra reliability.

Features:
- Standard 9.800" and tall 10.200" deck heights available for stroker engines.

- Standard 4.250" , 4.500" or 4.600" bore sizes with siamesed extra thick cylinder walls to resist cracking and improve ring seal (minimum .300" thick with 4.625" bore).

- Uses +.300" tall Gen VI style lifters. Modification for Gen IV style available.

- Scalloped outer water jacket walls improve coolant flow around the cylinder barrels to equalize temperatures.

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

- True priority main oil system lubricates the main bearings before the lifters. Our stepped main oil gallery (9/16" to 1/2" to 7/16") increases the flow of oil to the crank at high rpm, and our front oil crossover eliminates internal oil leaks around the distributor shaft.

- Oil filter pad is drilled and tapped for an external oil pump.

- Lifter valley head stud bosses prevent blown head gaskets.

- Rear main cap uses standard oil pump and two piece seal - no adapter required!

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

- Dual oil pan bolt patterns fit standard and notched oil pans.

- Coated cam bearings, freeze plugs and dowels are included.

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!