Crate Engine World Headquarters

Build your engine on a strong foundation with Dart’s new
cast-iron Big M big-block. The Big M uses standard big-block
components - and then adds features you won’t find in any
production casting.



Discover the Dart advantage - and rock the competition with a Dart
block!

• Siamesed extra-thick cylinder walls resist cracking and improve
  ring seal (minimum .300" thick with 4.625" bore).



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



• Standard 9.800" and extra-tall 10.200" deck heights available
  for stroker engines.



• Four-bolt main bearing caps in steel or ductile iron have
  splayed outer bolts for extra strength.



• rankshaft tunnel has clearance for a 4.500" stroke crank with
  steel rods without grinding.



• True "priority main" oil system lubricates the main bearings
  before the lifters.



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



• Rear four-bolt cap uses standard oil pump and two-piece seal -
  NO adapter required.



• Lifter valley head stud bosses prevent blown head gaskets
  between head bolts.



• External block machining reduces weight without sacrificing
  strength.



• 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.



• Bellhousing flange and rear main bearing are reinforced with
  ribs to resist cracks.