GM Performance Parts SB-Chevy Bowtie Vortec Cylinder Heads


GM Performance
GM Performance Parts SB-Chevy Bowtie Vortec Cylinder Heads

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Bowtie Vortec Cylinder Heads are GM Performance Parts' most powerful cast iron cylinder heads designed for street or racing applications in the 400-450 horsepower range. As an upgraded production head, they come with bigger valves, a thicker deck surface, and a 66cc combustion chamber, which offer tremendous low-lift flow numbers. Bowtie Vortec Cylinder Heads offer you Fast Burn performance in an affordable cast iron head that is often used for short-track racing applications.

809-25534421
Small Port Vortec Bowtie Head Assembly
  • Completely assembled, ready to bolt-on
  • 185cc intake port
  • 65cc exhaust port
  • Uses Fel-Pro #375-1470 exhaust gasket
  • Sold individually
    View this item

    Fits Applications
    		• $504.99
    Ships
    02/17/12
      809-25534351
    		Small Port Vortec Bowtie Bare Head
  • 185cc intake port
  • 65cc exhaust port
  • Uses Fel-Pro #375-1470 exhaust gasket
  • Sold individually
    View this item

    Fits Applications
    		• $381.99
    Ships
    02/21/12


  • Cast iron small runner or large runner heads
  • 66cc combustion chamber, .450" deck thickness
  • No heat risers
  • Machined for 2.00"/1.55" valves
  • Hardened exhaust valve seats
  • 0.530" max valve lift (without modifications)
  • Drilled and tapped for screw-in studs (7/16-14)
  • Dual bolt patterns for perimeter bolt and center bolt valve covers
  • Dual bolt patterns for both Vortec and early model intake manifolds (use early model P/N 10051103 or Vortec design P/N 12366573, P/N 12496820, P/N 12496821, P/N 12496822, or P/N 12499371
  • Use production intake gasket P/N 12529094 for Vortec intakes or dual bolt pattern intake gasket P/N 12497760 for either early model or Vortec design manifolds
  • Vortec logo (intake port roof), GM logo (intake port floors) & Bowtie logo (exhaust side) are cast-in