World’s MERLIN series has earned a reputation as the performance industry standard for Big Block Chevy power.
The cast iron MERLINS are available in both oval and rectangular port designs, with intake ports offered in 269cc, 320 and 350cc configurations. Choose the port size that will provide the optimum balance of flow and velocity for your engine combination.
They are available bare or in complete assemblies that feature multi-angle valve jobs, Manley stainless steel valves and valve springs matched to camshaft requirements.
World Products Merlin cylinder heads for big Chevys combine large intake runners with open combustion chambers to produce good torque and low-end power. Assemblies include valves, springs, retainers, keepers, chromemoly screw-in studs, and hardened steel guideplates.
These heads are also available in Marine trim, equipped with ultra high temperature Inconel exhaust valves and other special components.
TECHNICAL SPECS
Casting ID Number: WOR-043D
Material: High density cast iron
Valve Seats: Intake (integral), exhaust (hardened)
Valve Guides: Integral cast iron
Spring Seats: Machined for 1.560" (can machine to 1.625")
Valves: Manley stainless steel valves in assemblies (inconel exhaust valves on marine applications)
Valve Diameter: 2.300" intake, 1.880" exhaust (11/32" stem)
Guide Plates: Stock (for best fit use World #830465-8)
Rocker Arm Studs: Screw-in style
Rocker Arms: Standard
Intake Runner: 269cc, standard port location
Exhaust Ports: 137cc, standard location
Combustion Chamber: 119cc
Spark Plug: 14mm 5/8" .460" reach tapered style
Valve Job: Multi-angle intake and radiused exhaust
Valve Cover Rail: Raised
Valve Angle: Stock 24°
Accessory Bolt Holes: Stock
Chamber Design: Open
Spring Specs
1.550": 125 lbs. @ 1.980", 300 lbs. @ 1.380", coil bind @ 1.160", max lift @ .750" (oval port only)
1.550": 150 lbs. @ 1.910", 350 lbs. @ 1.260", coil bind @ 1.210", max lift @ .650"
Head Flow @ .800 Lift
293 intake, 268 exhaust (Super Flow 1050)
316 intake, 290 exhaust (Super Flow 600)
All heads flowed with a standard .750" intake plate, without exhaust tube, and 28" of water.
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