Chevy “Double Hump” Cylinder Heads

Chevy Double Hump Fuelie Heads

492 “double hump” head with “Undercover Porting” and angle milled. Note the spark plug cooling holes were plugged before the angle milling

The “double hump” or “fuelie” heads have been around since the 1960’s. They are still used in a variety of applications. We have a good supply of used ‘492 & ‘186 available with everything from “Undercover Porting” to SST Ported.

Stock “double hump” heads flow 202 cfm intake and 141 cfm on the exhaust. If you must maintain a stock looking port, consider our “Undercover Porting”. With our “Undercover Ported” they will flow 220-230 cfm intake and 165 cfm exhaust. This flow improvement will add 15 to 25 horsepower to your engine.

Ported ‘492 Cylinder Head

We have CNC programs for the “double hump” heads. An option to consider is to use the aftermarket Dart heads with a disguise package to resemble the original “double humps”. The Dart heads offer superior air flow to the early “double hump” heads. We are Masters of Disguised Heads.

Intake Manifolds

Most of the classes that run “double hump” cylinder heads run a cast iron intake manifold. We have everything from acid ported to fully ported cast iron intake manifolds that work terrific with “double hump” heads.


 

Part#
Description
Price

LMS-DH-UC
Complete “Double Hump” heads with “Under­cover Porting“.  Assembled with 11/32″ stainless steel valves, flat tappet springs, spring locators, steel retainers, machined locks, rocker studs and guide plates. Flat surfaced to your specifications. 
$2,595.00

DH-UC
“Double Hump” castings, bare, machined for screw-in studs, new guides & “Undercover Porting“.
$1,595.00

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.