Aluminum GM 3782461 Chevy 327 SBC Camel Back/Double Hump Cylinder Head Assembled

Description

Features 180cc intake runner, 62cc exhaust runner, 2.02" intake/1.60" exhaust valves, 1.560" max spring pocket diameter, Forged from premium quality aluminum that shaves 40 lbs. off the nose of your car vs. heavy iron heads, Comes completely assembled with no accessory bolt holes, just like the original heads, Improved port/chamber shape for better performance with the 3-angle machined valve job that promotes better flow, especially at low-to-mid lifts, Designed for 4" bore 1962-86 small block engines (302/327/350)
Chevy SBC Assembled Aluminum Camel Double Hump 461 Cylinder Head
Sku # 9103782462
Mfr. Part # 9103782462
Condition
New
Brand
Speedway Motors
Sold
Each
Details
Notes
Stock stamped steel rocker arms will not clear 1.437” diameter valve springs on these heads. Must use aftermarket roller tip or full roller rocker arms if using large diameter springs. We recommend 57533501or 57523501. Heads feature valve cover rails that are raised 3/8” so you can use roller rockers with
original '59-up Corvette valve covers
(note - some factory A/C brackets may have interference issues). Rocker arm studs should be torqued to 45 ft.-lbs.
Intake port measures 2-1/16” x 1-1/8” which works with Fel-Pro 1205 style gaskets. Exhaust ports are square and work with Fel-Pro 1404 style gaskets.
Champion
271RC12YC
style spark plugs (14mm thread, 5/8" hex, flat gasket seat, .750" reach) are what we recommend as a starting point. This is a straight plug head (not angled plug). Ignition timing should be between 35 to 38 degrees total. Set the timing with the vacuum advance hose disconnected and rev the engine up until the mechanical advance is fully in, then set it at 35 degrees to start with. You can experiment with more timing later to see if the engine runs better at closer to 38 degrees, but we don't recommend exceeding 38 degrees on most applications.
Valve guides are machined for modern positive stop stem seals. Measures .540” OD where the seal is pressed on.
Heads are not drilled for steam holes that are required on SBC 400 engines.
Recommend head gasket for 4” bore engines is the Fel-Pro 1003 style gasket.
Head bolts such as 50542171 and washers 50542102 are recommended. Torque to 50-65-80 ft.-lbs., with 75 ft.lbs. torque on the bottom. Use Permatex 80631 style sealant on the threads.
If wanting to run power steering, you would need to utilize the Corvette-style "Ram Horn" Exhaust Manifolds 9300328, along with both 91603050 and 91067850 to mount the generator/alternator up on the driver's side. Then you might be able to use a lower power steering pump bracket such as 91332902 or 91033727, depending on your pump and frame/steering box clearance, to mount the P/S pump low on the driver's side.
Info
Visually similar to the 461 heads (GM #
3782461
) which first appeared on the 1961 Corvette “fuelie”
No accessory bolt holes
, just like the original heads
Heads are sold EACH
Aluminum heads shave 40 lbs. off the nose of your car vs. 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
64cc fast-burn combustion chambers deliver big power gains vs. 461 castings
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
Swirl polished & undercut stainless steel valves
Intake flows 232 CFM @ .500” lift
Exhaust flows 173 CFM @ .500” lift
Accepts both perimeter and center bolt valve covers
Single 1.46” diameter valve springs w/ inner damper
Suitable for flat tappet camshafts
up to .550” lift
7 degree lightweight chromoly retainers and keepers
Hardened steel spring cups for durability
High nickel valve seats provide optimum heat transfer and wear characteristics
Manganese bronze valve guides reduce friction
Viton positive valve seals are a modern upgrade from stock 461 castings
2-piece hardened steel pushrod guide plates for use with hardened pushrods
3/8” chromoly screw-in rocker arm studs included
Blocked exhaust heat riser manifold crossover port
3/8” NPT coolant temperature probe port
Designed for
1962-86 small block
engines (302/327/350)
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.
GM produced many versions of the Chevy camel back heads, 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). With a coat of Chevy Orange paint, you'll have everyone convinced you're running an original set of 461 double hump heads.
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 93000328. 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 91603050 and 91067850 to mount the generator/alternator. When going this route, you may also be able to use a lower power steering pump bracket such as 91332902 or 91033727, 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.
Application
This Part Fits
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.
WARNING: Cancer and Reproductive Harm -- p65Warnings.ca.gov
California Customers: This part has been identified as emissions sensitive and can only legally be installed on race-use only vehicles, off-road-use only vehicles, or pre-1965 vehicles in the State of California in accordance with the California Air Resource Board (CARB) requirements. Once your order is placed you will be contacted by Speedway Motors within 2 business days so that you can certify that you will only use such parts on these types of vehicles in California.
Specs
Material Type
Aluminum
Sold in Quantity
Each
Finish
Natural
Cylinder Head Style
Assembled
Spark Plug Style
Straight
Combustion Chamber Volume
64cc
Intake Port Location
Standard
Intake Port Shape
Rectangle
Exhaust Port Shape
Square
Exhaust Port Location
Standard
Number of Springs Per Valve
Single
Retainer Material
Chromoly Steel
Lock Style
7 Degree
Valve Stem Seal Type
Positive Stop
Valve Cover Mounting Style
Center and Perimeter Bolt
Valve Seat Machine Style
3-angle
Valve Seat Material
Powdered Metal
Oiling Style
Through Pushrod
Valve Guide Material
Manganese Bronze
CNC-Machined Combustion Chamber
No
Intake Valves Included
Yes
Valve Spring Included
Yes
Damper Spring Included
Yes
Retainers Included
Yes
Locks Included
Yes
Rocker Arm Nuts Included
No
Guideplates Included
Yes
Accessory Bolt Holes Drilled
No
Valve Seats Machined
Yes
Steam Holes Drilled
No
Machined for O-Ring
No
Heat Crossover
No
Valve Guides Included
Yes
Valve Stem Seals Included
Yes
Intake Valve Diameter
2.020
Exhaust Valve Diameter
1.600
Guideplate Pushrod Size
0.3125
Exhaust Valves Included
Yes
Rocker Arms Included
No
Intake Runner Volume Range
180cc - 189cc
Exhaust Runner Volume Range
60cc - 69cc
Combustion Chamber Volume Range
60cc - 69cc
Exhaust Runner Volume
62cc
Intake Runner Volume
180cc
CNC-Machined Runners
No
Rocker Arm Studs Included
Spring Diameter
1.460
Maximum Lift
0.550
Exhaust Valve Angle
23
Intake Valve Angle
23
Notes
Bare head weighs 19.6 lbs. each.
Related Items / Suggested Parts
Corvette-Style 2-1/2 Inch Ram Horn Exhaust Manifolds, Pair
Powermaster 82051 PowerGEN 1955-64 GM Alternator, 12-Volt, Plain
Finned 1960-86 Small Block Chevrolet Valve Covers, Plain
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About
Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 68 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.
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