An Economical Stock Replacement Head.

There are many compelling reasons why it's smart to use S/R cylinder heads instead of worn out junkyard parts or new OEM castings. These heads come with hardened steel exhaust seats compatible with unleaded gasoline. The extra thick decks and walls improve reliability. All heads include screw-in rocker studs. The machined valve cover rails help to eliminate leaks.

Technical Specifications

Material: High density cast iron
Valve Seats: Integral intake,hardened steel exhaust
Valve Size: 1.940'' x 1.500''
Rocker Arm Studs: 3/8'' shank, screw-in style with hex shoulder furnished
Accessory Flange: Stock locations, 7-bolt universal pattern

Included In Assembly: Manley Street Flo stainless steel valves (1-piece forged, with undercut stems and swirl-polished heads), ring and band valve seals, valve springs, Manley 7° chrome moly retainers, keepers.

Recommended Installation Items:
Head Gaskets: Fel-Pro #1003 (265-350) or equivalent.
Pushrods: OEM can be used. Hardened not required
Spark Plugs: Accepts 14mm-5/8'' .460'' reach tapered seat (Accel 274 or 276, AC-Delco 43TS or 44TS, Champion #670 or #802) or equivalent
Intake Gasket: Fel-Pro #1204 or #1256 or equivalent
Exhaust Gasket: Fel-Pro #1404 or #1405 or equivalent

Here are the OEM casting numbers that World's S/R small block heads replace:

World #043600 = GM 333882, 460703, 462624, 468642, 3911032, 3927186, 3927187, 3932141, 3946813, 3947041, 3970126, 3973414, 3973493*, 3974387, 3981598*, 3986339, 3998920, 3998991, 3998993, 3998997, 14020516, 14020517, 14020556, 14071114, and 14079261.

World #043610 = GM3795896, 3814482, 3827185, 3884520, 3890462, 3911032, 3917290, 3917291, 3927186, 3932441, 3946813, 3973370 and3998993 *=Requires drilling for steam holes