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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.
Casting ID Number: WOR-043C, WOR-043B 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: 320cc or 345cc, standard port location Exhaust Ports: 137cc, standard location Combustion Chamber: 119cc Spark Plug: 14mm Threads 5/8" Socket .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": 150 lbs. @ 1.910", 350 lbs. @ 1.260", coil bind @ 1.210", max lift @ .650" 1.550": 225 lbs. @ 1.910", 520 lbs. @ 1.210", coil bind @ 1.160", max lift @ .700" 1.640": 275 lbs. @ 2.000", 600 lbs. @ 1.200", coil bind @ 1.050", max lift @ .900"
Head Flow 310cc @ .700 Lift 364 intake, 262 exhaust (Super Flow 1050) 391 intake, 284 exhaust (Super Flow 600) 345cc @ .700 Lift 370 intake, 261 exhaust (Super Flow 1050) 397 intake, 283 exhaust (Super Flow 600) All heads flowed with a standard .750" intake plate, without exhaust tube, and 28" of water.
