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.

These heads require a Shaft Type Rocker Arm set up like JESEL part #KPS325131. You’ll also 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!

They’re available bare, or in two different assemblies that are designed to match your camshaft’s valve spring requirements. A multi-angle valve job and Manley stainless steel valves make the assemblies an excellent value and a real time-saver for engine builders.

-3 Assembled Heads: Solid Roller Street Cam
1.550": 225 lbs. @ 1.910", 520 lbs. @ 1.210", coil bind @ 1.160",
MAX LIFT @ .700"

-4 Assembled Heads: Solid Roller Race Cam
1.640": 275 lbs. @ 2.000", 600 lbs. @ 1.200", coil bind @ 1.050"
MAX LIFT @ .900"