It got the name fuelie from the fact that it was used on optional high performance fuel injected SBC engines, mainly installed in the Corvette. Check out the details, modifications, and tests we run on various types of heads… They were used from '68 through '72 on 302 CI Z-28 engines as well as '70 through '72 in LT-1 350 CI Corvette/Z-28 engines. The most common heads sought by engine builders are ones identified variously as the "Camel Back," "Double Hump" or "Humper" heads used on a range of passenger cars and performance vehicles. Not all casting symbols are equal and many have minimal visual differences. Although there are some variations, they generally have small chambers for the high-octane unleaded fuel readily available at the time, smaller intake ports and valves that measured either 1.94 for the intake and 1.50 for the exhaust or 2.02 and 1.60 respectively. When there are no mounting holes, you need to use a short water pump with the factory brackets. The “double hump” or “fuelie” heads have been around since the 1960’s. The result of testing at higher valve lift levels could only skew the results away from a racer's real-world needs. Casting number "462" fuelie heads These heads will also interchange with other camel hump heads with casting numbers 461, 461X, 462, 291, 292, 186, 041, & 492. $739.00. Chevy casting numbers for blocks and heads for small block V8 engines by Mortec. UNCC. Call show contact info. The University also offers a very well-stocked motorsports laboratory that supports student-led racing teams (including a Legends car, a drag racer, a Formula SAE open-wheel racer, and others) with the intention of helping them get real-world racing experience. An aftermarket cylinder head is almost a necessity—1966-69 Corvette “camel hump” cylinder heads being the rare exception. We aren't sure exactly why this happens, but it does prove that it's always better to look at entire engine systems as a whole versus several small components individually. Search titles only; Posted by Member: Separate names with a comma. They are supposed to be for an untouched 461 head with 1.94/1.50 valves. There are other part numbers within the double-hump family, but these two (called 462 and 291 for the last three digits in their part numbers from here on out) are generally considered the best of the bunch. Administrator. The first shot is with the valve at 0.150 lift, the second shot is at 0.300 lift and the final shot is as 0.450 lift. I started mocking up my 283 with a set of the 461 double hump heads and found a bunch of issues pretty quickly. Refurbished. Small block chevy head castings; Casting # Combustion Chamber size CCs Intake valve Exhaust valve Production Years Misc Engine; 10033867: 62cc: 2.02: 1.60: over the counter 23 degree, angle plug, 196 cc intake runner, Aluminum Make an offer: Refurbished. Some with valves some bare. Answer Save. $739.00. Double-hump heads were popular performance upgrades for engines that were not equipped with them and are in high demand today in racing applications where factory heads are required. The reason this is important is when we start plugging numbers into a compression ratio program—the short stroke makes adding compression difficult without going to domed pistons. Circle Track's University Partnership Finding out how much different part numbers can vary within the double-hump family was actually a project undertaken by the Motorsports and Automotive Research Center at the University of North Carolina at Charlotte (UNCC). When Trick Flow introduced their DHS heads in a 175 version they were aiming squarely at the guy … Re: Runner volume chart for vintage SBC heads? About this product. In general terms, yes. chevy double hump heads with cast # 461 , 462 , 291 what are the horsepower or where can i find info? Newer Than: Search this thread only; Search this forum only. Some of these are also nicknamed "Fuelie" heads because a version appeared on fuel-injected 327-powered Chevy Corvettes. The bigger heads to follow were the “double-hump” heads championed by the mid-’60s 327 engines. I'd like to compare them to the -291 heads I have. These heads were used during the '60s and '70s on various performance engines. 327 chevy double hump heads 60cc 1966. Pre-Owned. Most need a lot of work just to bring them back to stock rebuild specs. All, I am getting two different opinions on which heads I should use on my 350. Along with a 1.94/1.6 intake/exhaust valve job, they were at least as effective as the expensive and illegal double hump heads. So no real reason to run massive lift. Step back in time with our modern reproduction of the iconic Chevy 461 double hump cylinder heads, now cast in lightweight aluminum! But while discussing the possibilities with Steve Johnson and Luke Woroniecki, who lead the student's activities in the Motorsports Lab, the two showed us the work being done by engineering student Dallas Dallman to compare different cylinder heads within the double-hump family. 45cc chambers, 2.20/1.60-inch valves, angle plugs, low port 18-degree head, 223cc intake ports, aluminum. For performance applications, there are other GM castings that are similar in specs. Today, many aftermarket choices are available that are cost-effective and better-performing substitutes. Pre-1969 heads do not have accessory mounting holes. Also known as "fuelie" heads, the 3782461 castings were used on many legendary Chevrolets from 1961-1967. Vortec heads have a 7/16" round pushrod hole in the head; earlier non self aligning rocker arm equipped heads have a 7/16" x 11/32" oval hole in them. Tests were also only performed to a maximum of 0.500-inch of valve lift because in the real world these heads are only raced in Street-Stock level classes, and the rules almost always limit maximum valve lift to half an inch or less. Common casting numbers are #461, #462 and #291. Ignore measurements here that are usually allowed within the rulebook to be changed during the course of a valve job-things like seat angle, valve diameter, and even valve stem diameter-instead, look at the height of the ports, the average port width, and even the port length. Their measurement did not end up as big as mine, I think they got 159cc, but I´m not sure. These heads appeared on 327 and 350 cubic inch engines across most of the 1960s (beginning in 1962). Chevy cylinder head Identification - Small block casting numbers, Big block cylinder head, camel back heads, double hump heads Chevy small-block engine head casting numbers identify the model year, horsepower range, valve and chamber size and the size of the intake and exhaust ports. Your information will be collected and used in accordance with our Privacy Policy, Chevrolet Double-Hump Cylinder Heads - The Same, But Not Equal. Most dated late 1964 thru 1968. Dallman tested both heads alone, and with a dual-plane intake, a two-barrel carburetor, and an air cleaner in place. On the Flow Bench Dallman ran several different tests with both heads on the flow bench. However, when the carburetor and intake are added to complete the intake tract, the straight-stem valves perform better. Chevy Heads Dauble Camel Hump 64cc 3991492. Of course, camel humps have been popular heads since they were new. There should be a "camel double hump" casting design on each end of the head. The double hump heads were factory installed on all High Performance Fuel Injected and carbureted Chevrolet vehicles including Corvette, Camaro RS SS & Z-28, Chevelle Malibu, Chevy II Nova, Bel Air, & Impala. Log in; Register; NastyZ28.com. They were manufactured with larger intake and exhaust port volumes and valves for the period, and engines equipped with them had output ratings of more than 350 horsepower. Those double-hump heads generally have 64cc chambers. If you tested only the cylinder head and the undercut valves on a flow bench without looking at how adding the carburetor and intake manifold affected the intake tract, you would mistakenly be led to believe that the undercut valves are the better option. This time Dallman placed a pitot tube in different areas of the port and measured the amount of flow. After all, they reduce the volume of the valve stem in the port, which should mean more room for the air/fuel charge to get by. Port mapping is also done on the flow bench. Keeping with the real-world aspects of these tests, Dallman used a Holley 500 cfm two-barrel carburetor and an Edelbrock 2101 dual-plane intake with a two-barrel adapter plate. These head castings were used in various other models of the Chevrolet lineup such as the passenger car, Chevy II/Nova, Camaro and Corvette. Single 4 bbl cars has smaller 1.94" intake valves. "Double-bosse" têtes ont été trouvés sur la plupart de ses moteurs à haute performance dans les années 1960 et au début des a
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