Chevy Open Chamber Cylinder Heads

Chevy Open Chamber Cylinder Heads

15 to 20 more horsepower with “Undercover Ported” Open Chamber heads

We have been working with the Chevy “Open Chamber” heads for years. If your rules require the use of “open chamber” heads, the ‘441, ‘487 & ‘993 heads work the best. While these heads are not available new from Chevrolet, we have a good supply. We can also modify your open chamber heads.

Our “Undercover Porting” will improve the air flow of stock open chamber heads from 203 cfm intake and 142 cfm exhaust to 225 / 230 cfm intake and 160 cfm exhaust. This air flow improvement will result in a 15 to 25 horsepower improvement while maintaining a stock looking ports!

We have a good selection of ‘441, ‘487 & ‘993 heads. All castings have new valve guides, pressure tested and machined for screw-in studs. Note: Heads without guide plates and / or press in studs are also available.


Complete Open Chamber heads (‘441, ‘487 or ‘993) with “Undercover Porting“. Assembled with 11/32” stainless steel valves, flat tappet springs,  steel retainers, machined locks, rocker studs and guide plates. Flat surfaced to your specifications. 

‘441, ‘487 or ‘993 castings, bare, machined for screw-in studs, new guides & “Undercover Porting“.

Open Chamber Cylinder Heads Top End Package: Above listed complete set of LMS-OC-UC cylinder heads ( ‘441, ‘487 or ‘993), modified Acid Ported or Stage 1 cast iron intake manifold machined to fit heads,  intake manifold gaskets, carb adapter or spacer and a custom ground flat tappet camshaft, ready to bolt on sells for $3,190.00.


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