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(294115) 99.5%,
Location: Lincoln, Nebraska
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Item: 134129367302
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Item must be returned within:30 Days
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Speedway Motors:Speedway Motors
Type:Cylinder Heads
Material:Aluminum
Manufacturer Part Number:9103782462
California Prop 65 Warning:True
Features 180cc intake runner, 62cc exhaust runner, 2.02″ intake/1.60″ exhaust valves, 1.560″ max spring pocket diameter, Cast 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 Info 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 and 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 off the block or water pump, or 2) pair these heads with our “rams horn” . 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 and alternator 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 or , 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 (or ) for a true nostalgic ‘60s experience. Installation Tips 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 or full roller rockers. 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 style gaskets. Exhaust ports are square and work with style gaskets. 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 4.00” bore engines is the style gasket. We recommend these and . Torque the head bolts to their final value in three steps. First step is to go to 50 ft. lbs. The second step then goes to 65 ft. lbs. The third step take the upper bolts to 80 ft. lbs and the lower row to 75 ft. lbs. Use on the threads. If running domed /pop up piston you will need to check for clearance. 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 2.02 Exhaust Valve Diameter 1.6 Spring Diameter 1.46 Guideplate Pushrod Size 0.312 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 Maximum Lift 0.550 Exhaust Valve Angle 23 Intake Valve Angle 23 Notes Bare head weighs 19.6 lbs. each. MFG. Part # 9103782462 Reviews Very impressed Rated by bill3337 on December 28, 2021 Summary: Im impressed with these new heads, although I havent fired the engine yet. Yes, I recommend this product. Great looking heads Rated by Andy on March 06, 2021 Summary: Great looking heads, will require a little port work before I run them. Valve job could be finished better. Ill be using them on my tunnel ram 327 for my 55 Chevy gasser project. Yes, I recommend this product. Very nice Rated by Jake on October 24, 2020 Summary: 327 L79 engine Pros: Made to look like original, but light, modern Yes, I recommend this product. Nice set of heads Rated by Lonnie on June 26, 2020 Summary: Nice old school look with up to date modifications Yes, I recommend this product. I would definitely recommend these double hump heads . Rated by Len on April 27, 2020 Summary: These are going on my 63 Impala SS and will cost a lot less then having all that work done on the original heads with better performance. Yes, I recommend this product. Related Items / Suggested Parts Champion 71 RC12YC Spark Plugs for Edelbrock Flathead Ford Heads Corvette-Style 2-1/2 Inch Ram Horn Exhaust Manifolds, Pair Finned 1960-86 Small Block Chevrolet Valve Covers, Plain Tech Support We’re here to help before and after your purchase. If you have a question or need assistance with one of our products, please contact us through eBay Messaging and a knowledgeable Speedway Motors team member will be happy to help. 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 71 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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