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!

Casting ID Number: WOR-070B, WOR-070C
Material: 355-T6 alloy high density aluminum
Valve Seats: Intake (hardened), exhaust (hardened)
Valve Guides: Manganese bronze
Spring Seats: Machined for 1.640" springs
Valves: Manley stainless steel valves in assemblies
Valve Diameter: Up to 2.350" intake, 1.880" exhaust (11/32" stem)
Rocker Arms: JESEL part #KPS325131
Intake Runner: 345cc, standard port location
Exhaust Ports: 132cc, standard location
Combustion Chamber: 80cc
Spark Plug: 14mm .750" reach gasket style
Valve Job: Multi-angle intake and radiused exhaust
Valve Cover Rail: Raised
Valve Angle: 16°
Accessory Bolt Holes: Stock
Chamber Design: Open