Small-Port Vortec Bowtie Cylinder Head Assembly

Product Details

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 Large Runner Cylinder Head
• 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 89017465 for Vortec intakes or dual pattern intake gasket P/N 19301685 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.

Small-Port Vortec Bowtie Cylinder Head Assembly
• Completely assembled, ready to bolt on
• 185cc intake ports
• 65cc exhaust ports
• Use Fel-Pro® P/N 1470 exhaust gasket
• Bare head P/N 19331471, available separately

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