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Dart Big "M" Sportsman Engine Block - Chevy 502
Dart Big "M" Sportsman Engine Block - Chevy 502

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Dart engineered the Big M to be the strongest, most reliable, and easiest to build big-block on the market. With available deck heights of 9.800" and 10.200" and bore sizes of 4.250", 4.500" and 4.600", the Big M gives you the versatility to build a wide variety of engine combinations. Dart redesigned the lubrication system to create a true priority main system that oils all of the main bearings before the lifters for extra reliability. Their 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 their oil crossover eliminates internal oil leaks around the distributor shaft. The result: more oil at the bearings and pushrods where it═s needed, and less power-robbing crankcase windage. Dart added two slotted head stud bosses on both sides of the lifter valley so you can use studs instead of hard-to-install bolts to take the place of the ˝missingţ head bolts. The Big M is fitted with billet steel 4-bolt main caps for ultimate bottom end strength. Dart machines Big M blocks in-house on precision CNC equipment to ensure quality and to eliminate the need for expensive ˝blueprinting.ţ

  • Siamesed extra-thick cylinder walls resist cracking and improve ring seal (minimum .300ţ thick with 4.625ţ bore)
  • Scalloped outer water jacket walls improve coolant flow around the cylinder barrels to equalize temperatures
  • Standard 9.800ţ and extra-tall 10.200ţ deck heights available for stroker engines
  • Four-bolt main bearing caps in steel or ductile iron have splayed outer bolts for extra strength
  • Crankshaft tunnel has clearance for a 4.500ţ stroke crank with steel rods without grinding
  • True ˝priority mainţ 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+H128
  • Sportsman blocks have nodular iron 4-bolt main caps. Cam bearings, freeze plugs and dowels are not included.



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    Make > Chevy
    Blocks > Aftermarket Blocks > Chevrolet - 454/502 Big Block V8
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