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World Products S/R Heads
The S/R is a street replacement cylinder head offered with either a 1.94” or 2.02” intake valve. The 1.94” version is called “S/R” and the 2.02” version “S/R Torquer”. In stock form air flow leaves a little bit to be desired for a racing engine. However, if you are interested in adding quite a bit more power to your engine, air flow can be significantly improved by Acid Porting the intake ports and performing “UnderCover Porting” to the exhaust side of the S/R head. A stock S/R head flows 195 cfm intake and 135 cfm exhaust. After our modifications the intake port will flow 225 to 235 cfm while the exhaust will flow around 160 cfm.
Intake manifolds for the S/R heads
Most of the S/R head classes are required to run a cast iron intake manifold. We have everything from acid ported to fully CNC machined intake manifolds that work terrific with the S/R style heads. Click to open Intake Manifold web section in a new window.
Free Camshaft
When you purchase a set of our complete heads with a matching intake manifold, a custom ground Reed flat tappet camshaft is included at no additional charge. Click HERE for for details
See full details about our complete head assemblies. Check out a list of options for our complete heads.
| Part # |
Description |
Price |
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| Complete S/R heads with "S/R UnderCover Porting". Assembled with Ferrea 5000 series valves, 1.250" springs, steel retainers, machined locks, rocker studs and guide plates. Flat surfaced to your specifications. See full details about our complete head assemblies. Check out a list of options for our complete heads. |
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2,195.00
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| LMS-S/R-UC |
Complete S/R heads with "S/R UnderCover Porting", 1.440" springs, spring locators, 6000 series Ferrea valves, pushrod holes opened & flat surfaced. See full details about our complete head assemblies. Check out a list of options for our complete heads. |
2,395.00 |
| S/R-UC |
S/R castings, bare, with "S/R UnderCover Porting". |
1,595.00 |
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Call us toll free at 866-236-6300 |
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