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PARTS INTENDED FOR COMPETITION USE ONLY.
Click for more details.

Racing Flag

PARTS INTENDED FOR COMPETITION USE ONLY.
Click for more details.

SMALL-BLOCK BOWTIE SPORTSMAN BLOCKS

12480174

350 BOWTIE SPORTSMAN BLOCK, 1-PIECE REAR MAIN SEAL

  • CNC-machined cast-iron competition block
  • +/-0.001” machining tolerances
  • 4-bolt mains, splayed caps on center three mains
  • 3.980” finished bore
  • 4.155” max bore (siamesed cylinder bores)
  • Extra-smooth gasket surfaces
  • Tall lifter bores
  • Comes with rear seal adapter  

12480047

350 BOWTIE SPORTSMAN BLOCK, 2-PIECE REAR MAIN SEAL

  • CNC-machined cast-iron competition block
  • +/-0.001” machining tolerances
  • 4-bolt mains, splayed caps on center three mains
  • 3.980” finished bore
  • 4.155” max bore (siamesed cylinder bores)
  • Extra-smooth gasket surfaces
  • Tall lifter bores

12480175

350 MAIN, 400 BORE SIZE BOWTIE SPORTSMAN BLOCK, 1-PIECE REAR MAIN SEAL

  • CNC-machined cast-iron competition block
  • +/-0.001” machining tolerances
  • 4-bolt mains, splayed caps on center three mains
  • 4.117” finished bore
  • 4.155” max bore (siamesed cylinder bores)
  • Extra-smooth gasket surfaces
  • Tall lifter bores
  • Comes with rear seal adapter  

12480157

350 MAIN, 400 BORE SIZE BOWTIE SPORTSMAN BLOCK, 2-PIECE REAR MAIN SEAL

  • CNC-machined cast-iron competition block
  • +/-0.001” machining tolerances
  • 4-bolt mains, splayed caps on center three mains
  • 4.117” finished bore
  • 4.155” max bore (siamesed cylinder bores)
  • Extra-smooth gasket surfaces
  • Tall lifter bores  

12480049

400 MAIN, 350 BORE SIZE BOWTIE SPORTSMAN BLOCK, 2-PIECE REAR MAIN SEAL

  • CNC-machined cast-iron competition block
  • +/-0.001” machining tolerances
  • 4-bolt mains, splayed caps on center three mains
  • 3.980” finished bore
  • 4.155” max bore (siamesed cylinder bores)
  • Extra-smooth gasket surfaces

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Unless specifically noted to the contrary herein, vehicles equipped with Chevrolet Performance parts that are emissions-related may not meet U.S., Canadian, and state and provincial laws and regulations relating to motor-vehicle emissions. These parts are designed and intended for use in vehicles operated exclusively for competition: in racing or organized competition on courses separate from public streets or highways. Visit www.chevroletperformance.com/emissions for more details.