Dart Big M Sportsman Block 9.800

Dart Big M 9.800 deck height. The Big M Sportsman 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:

• 9.800 Deck height.
  
• 4.250-4.600" Available 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 ductile iron 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.
  
• Small bore 396 version available
  
• Coated cam bearings, freeze plugs and dowels are NOT included.