Chevy Open Chamber Cylinder Heads

Chevy Open Chamber Cylinder Heads

“Undercover Ported” ‘993 Head

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.

Part#
Description
Price

LMS-OC-UC
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. 
$2,495.00

OC-UC
‘441, ‘487 or ‘993 castings, bare, machined for screw-in studs, new guides & “Undercover Porting“.
$1,495.00

Free Custom Camshaft: With your purchase of a complete set of modified heads and a matching, modified intake, we will supply a custom ground flat tappet camshaft designed specifically for your application.

Cylinder Head Design Form: Fill out our online form for a recommendation and pricing on a set of heads built specifically for your application. Also, here is a link to more detailed information on our Complete Cylinder Head Assemblies. Cylinder Head FAQs

Sending your cylinder heads to us for modifications? Check out our head shipping tips.

 

 

 

Intake Manifold FAQ’s

Free Custom Camshaft: Now, with your purchase of a complete set of modified heads and a matching, modified intake, we will supply a custom ground flat tappet camshaft designed specifically for your application. The custom flat tappet camshaft, which normally would cost $185.00, will cost you nothing!

Cylinder Head Design Form: Fill out our online form for a recommendation and pricing on a set of heads built specifically for your application. Also, here is a link to more detailed information on our Complete Cylinder Head Assemblies. Cylinder Head FAQs

Sending your cylinder heads to us for modifications? Check out our head shipping tips.