World’s S/R cylinder heads are the preferred alternative to expensive OEM castings or junkyard rebuilds. These heads are designed with extra-thick decks and walls for improved reliability as well as equipped with hardened steel exhaust seats that are compatible with today’s unleaded gasolines. They also come with screw-in rocker arm studs for extra durability. Needless to say, the S/R is substantially more durable than OEM castings.
Valve cover rails have been raised and carefully machined to eliminate oil leaks and the heads can accommodate either early style perimeter or late model center bolt valve covers.
S/R Cylinder heads are fully 50-state emissions legal and because they are an OEM replacement head, they are legal for use by many oval tracks and race Sanctioning organizations...
- NHRA
World castings #043600 and #043610 as replacements for Chevrolet 041, 186, 291, 462 and 492 cylinder heads.
- United Rebel Sprint Series
World Products S/R Cylinder Heads are the ONLY heads allowed.
- WISSOTA
Approved for use by The Amsoil Dirt Track Series.
GM REPLACEMENT PART NUMBER CONVERSIONS
World #043600 = GM 333882, 460703, 462624, 468642, 3911032,3927187, 3932141, 3946813, 3947041, 3970126, 3973414, 3973493* 3974387, 3981598*, 3986339, 3998920, 3998991, 3998993, 3998997, 14020516, 14020517, 14020556, 14071114, 14079261
World #043610 = GM 3795896, 3814482, 3827185, 3884520, 3890462, 3911032, 3917290, 3917291, 3927186, 3932441, 3946813, 3973370, 3998993
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