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Dart Machinery, LTD. stands behind each product we manufacture 100%. Each component undergoes a detailed manufacturing process that involves the hundreds of calculated and precision steps to ensure the finest quality possible.
BigM Sportsman

Big M Sportsman

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Description

Dart engineered the Big M to be the strongest, most reliable, and easiest to build big block on the market.

With deck heights of 9.800” and 10.200” and bore sizes up to 4.600”, the Big M gives you the versatility to build a wide variety of engine combinations.

The Big M is fitted with Billet Steel 4-bolt main caps for ultimate bottom end strength. The Sportsman block is fitted with Ductile Iron 4-bolt main caps.

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• Standard 9.800” and tall 10.200” deck heights.

Standard 4.250”, 4.500”, 4.560” 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.

• 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).

• Big M: Parts kit included.


CGI  Blocks – Turbocharged, Supercharged and Nitrous Applications! Dart Cast Iron blocks are available with Compacted Graphite Iron by special order. Double the strength without added weight.

Dart blocks can be special ordered with a wide array of special machining options to suit your specific requirements.

Big M Sportsman – Iron

31273344 – Ductile Std. Std.   9.800 4.250

31273354 – Ductile Std. Std. 10.200 4.250

31273444 – Ductile Std. Std.   9.800 4.500

31273454 – Ductile Std. Std. 10.200 4.500

31273544 – Ductile Std. Std.   9.800 4.560

31273554 – Ductile Std. Std. 10.200 4.560

31273644 – Ductile Std. Std.   9.800 4.600

31273654 – Ductile Std. Std. 10.200 4.600


Big M – Iron

31263344 – Steel Std. Std.   9.800 4.250

31263354 – Steel Std. Std. 10.200 4.250

31263444 – Steel Std. Std.   9.800 4.500

31263454 – Steel Std. Std. 10.200 4.500

31263544 – Steel Std. Std.   9.800 4.560

31263554 – Steel Std. Std. 10.200 4.560

31263644 – Steel Std. Std.   9.800 4.600

31263654 – Steel Std. Std. 10.200 4.600

BBC Mark 4 Block Information Packet – B17

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