bowtie sportsman blocks

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

Subscribe to the Chevy Performance enthusiast monthly newsletter.


Check out Chevrolet Performance product releases, future car builds, and more.

Connect


Connect with Chevy Performance.

Unless specifically noted to the contrary herein, vehicles equipped with Chevrolet Performance Parts may not meet Federal Motor Vehicle Safety Standards and emissions regulations and should not be operated on public roads. Chevrolet Performance customers are responsible for ensuring their use of Chevrolet Performance complies with applicable federal, state, and local laws, regulations, and ordinances. Many parts intended for racing or other “off-highway” use are not designed or tested for crashworthiness or to meet the safety needs of the motoring public, and may adversely affect the original intended performance or handling characteristics of the vehicle. These parts are designed and intended to be used with experts supervising their installation and use, to help assure the proper and safe operation of the vehicle.

  • The Manufacturer's Suggested Retail Price excludes tax, shipping and installation. Individual retailer pricing may vary. Please see your local dealer or retailer for details.

  • The Manufacturer's Suggested Retail Price excludes destination freight charge, tax, title, license, dealer fees and optional equipment. Click here to see all Chevrolet vehicles' destination freight charges.