When it comes to high performance replacements for factory cast iron heads, World’s WINDSOR JR. has the market covered with 180cc intake runners, plus the 64cc exhausts ports are substantially larger than OEM Ford heads. Add a highly efficient combustion chamber design and larger valves and you have big bolt-on power. These heads are also 50-State emissions legal factory replacements. Marine applications are also available, equipped with high temperature inconel exhaust valves.

Casting ID Number: I-058
Material: High density cast iron
Valve Seats: Intake (integral), exhaust (hardened)
Valve Guides: Integral cast iron
Spring Seats: Machined for 1.560" and 1.250"
Valves: Manley stainless steel valves in assemblies (inconel exhaust valves on marine applications)
Valve Diameter: 1.940" intake, 1.600" exhaust (11/32" stem)
Guide Plates: Special World part #830460-8
Rocker Arm Studs: Screw-in style
Rocker Arms: Adjustable rockers recommended. 1.6 ratio (use of 1.73 ratio will require elongation of pushrod holes)
Intake Runner: 180cc, standard port location
Exhaust Ports: 64cc, standard location (dual exhaust bolt pattern to accommodate large custom headers)
Combustion Chamber: 58cc
Spark Plug: 14mm 5/8" .460" reach tapered style
Valve Job: Multi-angle intake and radiused exhaust
Valve Cover Rail: Raised
Valve Angle: Stock 20°
Accessory Bolt Holes: Stock
50-State Emissions legal

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
236 intake, 169 exhaust (Super Flow 1050)
254 intake, 176 exhaust (Super Flow 600)

All heads flowed with a standard .750" intake plate, without exhaust tube, and 28" of water.