Chevy SBC Assembled Aluminum Camel Double Hump 461 Cylinder Head

• Visually similar to GM casting #3782461, which first appeared on the 1961 Corvette “fuelie”
• No accessory bolt holes, just like the original heads
• Aluminum heads shave 40 lbs. off the nose of your car vs. original 461 iron heads
• Improved port/chamber shape for better performance and efficiency
• Standard port location for use with most intake and exhaust manifolds
• 180cc intake port volume (factory 461 casting was 160cc)
• 62cc exhaust port volume (same as factory 461)
• 64cc fast-burn combustion chambers deliver big power gains vs. 461 castings
• Combustion chamber volume number was calculated using an Autolite 3934 spark plug
• Includes Swirl polished & undercut stainless steel 2.02” intake/1.60” exhaust valves (most 461 castings were 1.94/1.50)
• 3-angle valve job promotes better flow, especially at low-to-mid lifts
• Intake flows 232 CFM @ .500” lift, exhaust flows 173 CFM @ .500” lift
• Flow numbers were measured with a SAENZ 600 bench, 4.030 bore fixture, 1205-style intake fixture, and 28 inches of water
• Exhaust port gained 20 cfm above advertised number by adding a 1-5/8 pipe (header), a larger 1-7/8 pipe flowed the same
• Accepts both perimeter and center bolt valve covers
• Single 1.46” diameter valve springs w/ inner damper
• High nickel powdered metal valve seats provide optimum heat transfer and wear characteristics
• Manganese bronze valve guides reduce friction
• Valve guides are compatible with all common valve materials and fuels
• Suitable for flat tappet camshafts up to .550” lift
• 7 degree lightweight chromoly retainers and keepers
• Hardened steel spring cups for durability
• Viton positive valve seals are a modern upgrade from stock 461 castings
• 3/8” chromoly screw-in rocker arm studs included
• 2-piece hardened steel pushrod guide plates for use with hardened pushrods
• Blocked exhaust heat riser manifold crossover port
• 3/8-inch NPT coolant temperature probe port
• Designed for 1962-1986 small block engines (302/327/350)
• Heads will fit on a .030-inch or larger bored out 283 block (2.02/1.60 valves) when 350 head gaskets are used

An Authentic Aluminum Reproduction of Chevy’s Camel Hump “Fuelie” Heads

Step back in time with our modern reproduction of the iconic Chevy 461 double hump cylinder heads, now cast in lightweight aluminum! Also known as "fuelie" heads, the 3782461 castings were used on many legendary Chevrolets from 1961-1967. Our all-new cylinder head casting is a modern take with all the old-school looks you desire out of a reproduction camel hump head. Features like fast-burn combustion chambers, high-velocity ports, large diameter valve springs, and positive stop valve seals bring the vaunted camel hump heads into the 21st Century.

Save yourself the hassles of hunting down original GM 3782461, 3782461X, or 3890462 castings, only to find out they can't be saved. By now, most original 461 heads have had multiple valve jobs and milled decks, which means buying a set is a gamble. Plus, when considering all the costs involved in machining them to accept modern valvetrain components, our all-new castings are a very cost-effective alternative that puts more money back in your engine build budget.

GM produced several versions of the Chevy camel back heads originally; however, these are visual copies of the very first double hump heads, often referred to as "fuelies" because of their use on Rochester Ram-Jet equipped Corvettes. As such, these heads will perfectly complement your nostalgic hot rod build or restomod muscle car, all the way down to the textured as-cast finish and cast parting line across the exhaust port side, just like the original heads. Plus, the raised valve cover rail means that full roller rocker arms will fit underneath original Corvette valve covers ('59-up covers). Our camel hump heads accept both perimeter bolt and center bolt valve covers. With a coat of Chevy Orange paint, you'll have everyone convinced you're running an original set of 461 double hump heads.

No Accessory Bolt Holes, Just Like the Originals, To Detract From Period Looks

Take note that these heads have no accessory bolt holes for the front drive (just like original 461s). There are a couple options to mount your alternator/generator: 1) you can rely on accessory mounts off the block or water pump, or 2) pair these heads with our "rams horn" exhaust manifolds. These 2-1/2" outlet manifolds feature built-in mounts for your generator/alternator and are correct for '62-'63 Corvettes. To utilize this method, you will also need both our alternator mounting bracket and alternator adjuster bracket to mount the generator/alternator. When going this route, you may also be able to use a lower power steering pump bracket such as our Saginaw bracket or Type 2 bracket, depending on your pump and frame/steering box clearance.

The original 3782461 castings delivered well over 1.1 hp/ci on many legendary Chevy models throughout the early ‘60s, which was a significant engineering achievement for the time. Highlights include the '61 Corvette 283/315hp and '62 Corvette 327/360hp (both with Rochester fuel injection and "Duntov" camshaft), the '63 Chevy 327/340hp, the '64 Chevy 327/365hp L76 and 327/375hp L84 (both with the "30-30" camshaft), and the '65 Chevy 327/350hp L79. With the undercover features included in these heads, you can expect even more performance out of your 283/302/327/350/383 SBC.

These fully assembled heads are ready to run and are a great match to flat tappet camshafts. They're compatible with solid (mechanical) flat tappet or hydraulic flat tappet cams with up to .550” lift. The valve springs (single with flat wire inner damper) have a seat pressure of 120 lbs. Valves are +.100" long and must be used in conjunction with aftermarket aluminum roller rocker arms to clear valve springs used which are 1.46" diameter. The valve springs have 120 lbs. @ 1.800" installed height and 290 lbs. of open pressure at 1.20” (coil bind is at 1.160”). Pair with a vintage Duntov or 30-30 grind (or aftermarket equivalent) for a true nostalgic ‘60s experience.