Dart Big M Sportsman Block 9.8 Deck 4.500 Bore PN 31273444

Description

Dart Big M Sportsman Big Block Chevy 9.8 Deck 4.500 Bore Ductile Caps PN
31273444
Dart engineered the Big M to be the strongest, most reliable and easiest to build big block on the market today. The sportsman block is fitted with ductile iron 4 bolt main caps and is also available in 10.200 deck and bores ranging from 4.250 to 4.600. We also carry the Big M line with steel billet main caps, check out our ebay store or send us a message.
Specs
• Standard 9.800 deck.
•
4.500” 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.
• 4-bolt main bearing caps in steel or Ductile Iron 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.
• Lifter valley head stud bosses prevent blown head gaskets.
• Dual oil pan bolt patterns fit standard and notched oil pans.
• Big M Sportsman: Parts kit sold separately (PN 32000002).
We also have many other blocks, heads, cranks, rods, pistons in stock. Call or message us with your needs.
Albert
Cobra Power
305-893-5018
Freight
All blocks are shipped via ground freight truck. We recommend having your block shipped to a commercial location with a loading dock and or forklift truck on site. All residential shipments and lift gates will cost extra. Please leave a message with your shipping address for a quote on freight.