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. This highly evolved, race-proven cylinder head is capable of supporting in excess of 800 horsepower in “as cast” form. World’s MERLIN III aluminum heads are available with 310cc or 350cc intake runners. The exhaust ports are 132cc. This all-new design from World’s engineering team combines flow characteristics common to expensive race-only heads with exotic splayed valve setups designed to accept up to 2.350" and 1.880" valves, as well as “standard” Mark IV intake systems. This has been accomplished through “rolling” the head to a 16° valve angle, designing highly efficient intake and exhaust ports and using a special 90cc combustion chamber. You’ll probably need to get a set of pistons that take advantage of the chamber design, but other than that you can use most of everything from a standard big block Chevy, so when you add up the performance potential versus total cash outlay, it’s clearly the HOT setup for Sportsman racers! NO RETURNS AND NO REFUNDS ON GARAGE SALE or CLEARANCE ITEMS!!!!