World Products has taken the Chevrolet’s Vortec-style cylinder head design to the next level with these superior-performing 23° MOTOWN 220cc intake runner heads. Combine these high-flow ports with generous 2.080” diameter Manley stainless steel intake valves and you can see where the extra power comes from.
They’re available bare, or in three different assemblies that are designed to match your camshaft’s valve spring requirements. A multi-angle valve job and Manley stainless steel valves make the assemblies an excellent value and a real time-saver for engine builders.
TECHNICAL SPECS
Casting ID Number: WOR-077B
Material: 355-T6 alloy high density aluminum
Valve Seats: Intake (hardened), exhaust (hardened)
Valve Guides: Manganese bronze
Spring Seats: Machined for 1.560"
Valves: Manley stainless steel valves in assemblies
Valve Diameter: 2.080" intake, 1.600" exhaust (11/32" stem)
Guide Plates: Stock
Rocker Arm Studs: Screw-in style
Rocker Arms: 1.5 ratio (use of 1.6 ratio may require elongation of pushrod holes), 1.5 offset on 235cc
Intake Runner: 215cc, standard port location
Exhaust Ports: 70cc, standard location
Combustion Chamber: 64cc, straight plug orientation
Spark Plug: 14mm .750" reach gasket style
Valve Job: Multi-angle intake and radiused exhaust
Valve Cover Rail: Raised w/ perimeter and center bolt pattern
Valve Angle: Stock 23°
Accessory Bolt Holes: Stock
Spring Specs
1.250": 100 lbs. @ 1.810", 300 lbs. @ 1.250", coil bind @ 1.200", max lift @ .570"
1.437": 125 lbs. @ 1.810", 340 lbs. @ 1.210", coil bind @ 1.160", max lift @ .600"
1.550": 200 lbs. @ 1.900", 480 lbs. @ 1.200", coil bind @ 1.150", max lift @ .700"
Head Flow @ .600 Lift
265 intake, 177 exhaust (Super Flow 1050)
283 intake, 189 exhaust (Super Flow 600)
All heads flowed with a standard .750" intake plate, without exhaust tube, and 28" of water.
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