DART BBC BIG M SPORTSMAN BLOCK9.8, 4.5 DUCTILE CAP

Description

Big M Sportsman series
blocks are engineered to be
strong, reliable, easy to
build and affordable. With
multiple deck heights and
bore sizes up to 4.600″,
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:

• 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.
• 2 bolt
  front and rear and 4 bolt
  interior ductile iron main
  caps have splayed outer bolts
  for extra strength.
• Crankshaft 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. 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 NOT
  li>