Chevrolet "Double Hump" / "Fuelie" Cast Iron Small Block Chevy Cylinder Heads

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 castings 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.

  '492 "double hump" head with "UnderCover Porting" and angle milled. Note the spark plug cooling holes were plugged before the angle milling
                                                    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. Masters of Disguise 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.

Stage 1 Intake. Over 20 horsepower gain @ 6,000 verse a stock intake Fully Modified 4 barrel Q-Jet Intake. Over 40 horsepower gain verse a stock intake


We have a good selection of "double hump" castings available. All castings have new valve guides, pressure tested and machined for screw-in studs. We can also rework your "Double Hump" Chevrolet heads.            
Part #



Complete "Double Hump" heads with "UnderCoverPorting". Assembled with 11/32" stainless valves, flat tappet springs, steel retainers, machined locks, rocker studs and guide plates. Flat surfaced to your specifications.


"Double Hump" castings, bare, machined for screw-in studs, new guides & "UnderCover Porting".


"Double Hump" castings, bare, machined for screw-in studs, new guides & SST Ported.


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. 

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 Assemlies.

Cylinder Head FAQ'S

Sending your cylinder heads to us for modifications?

Brzezinski Racing Products, Inc. The #1 Name in Cast Iron. Call us toll free at 866-236-6300


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