Vortec Bowtie Cylinder Heads

Vortec Bowtie Cylinder Heads
Vortec Bowtie cylinder heads are the most powerful cast-iron heads offered
by Chevrolet Performance. These upgraded production cylinder heads are
ideal for 400-450 horsepower street and racing (great for circle track applications)
engines. Vortec Bowtie cylinder heads come with bigger valves,
a thicker deck surface and 66cc combustion chambers. The heads provide
outstanding low-lift flow numbers (the more air you flow, the more potential
power) and Fast Burn performance all in an affordable, cast-iron head.

Vortec Bowtie Cylinder Head Technical Notes:
• Cast-iron small runner or large runner cylinder heads*
• 66cc combustion chambers
• 0.450" deck thickness
• Hardened exhaust valve seats
• Machined for 2.000"/1.550" valves
• Maximum 0.530" valve lift (without modifications)
• Straight spark plug design
• No heat risers
• Drilled and tapped for 7/16"-14 screw-in studs
• Dual bolt patterns for Vortec and early style intake manifolds (early
model P/N 10051103; Vortec intakes P/N 12366573,12496820,
12496821, 12496822 or 12489371)
• Use intake gasket P/N 12529094 for Vortec intakes or dual pattern
intake gasket P/N 12497760 for early model intakes or Vortec design
intake manifolds
• Dual bolt patterns for perimeter-style and center-bolt valve covers
• Vortec intake manifold three-step torque specs: 2 lb.-ft.; 9 lb.-ft.; 11 lb.-ft.