327 Double Hump Heads HorsepowerCam --> I used this cam in my 327 --> CompCams XE256H-10. Description Price LMS-DH-UC Complete “Double Hump” heads with “ Under­cover Porting “. 66cc chambers and they rocked!!! pdq67 Ps. " Short Double-Hump Casting Marks Heads with short double-hump casting marks were used in later high-performance SBCs. Fuelie Cylinder Heads Launched SBC Performance. In 1968 GM claimed that the 327 produced that year was putting out 250 hp. 025" piston deck height, a Fel-Pro 1094 head gasket and heads milled for 65cc chambers. The top head is the 'lower horsepower' version (300hp and under) used on 67-68 327 applications with 1. As already mentioned by others, there are better heads available now. To answer your question, yes, a '66 327/275 will have the smaller "Fuelie Heads" with 1. 0% Total voters 4 how much horsepower from a 327 24406 Views 13 Replies 8 Participants Last post by TurboS10 , Feb 8, 2005 L Levis 57. Take into account parasitic loss of about 70 hp from the flywheel through the transmission, driveshaft, rearend and finally the tires, and it’s a safe estimation that approximately 180 ponies were actually punching the pavement. Matt,A few thoughts on heads,the stock 283 64cc heads on a 283 were listed as 9. It also has a rv cam, headers, and performer intake with a 600 cfm carb. And that prior to '64, the double hump heads were just medium valve jobbers b/c I have a virgin chambered pair of 2. This is the cam recommended to me by Comp Cams and my engine builder. By far, the most iconic Chevy 327 engines were the L76, L79, and L84 versions, the latter of which had primitive fuel injection. 4 L) variant followed, turning out as much as 375 hp (280 kW) (SAE gross power, not SAE net power or the current SAE certified power values) and raising horsepower per cubic inch to 1. Instead of headers, look into 2½" ram horn exhaust manifolds. Rated at 375 hp, the fuel-injected 327. This article will cover everything you need to know about the Chevrolet 327 engine that. 50" -461x double hump heads that were used on the 315hp/283 FI engine. Today, these engine-breathing regulators are usually referred to as “Fuelie” heads, because they were released on Corvettes with Rochester’s fuel injection. I did a full re-build on it port, polished, new pistons, roller cam, double hump original. Though it’s using SAE Gross measurements, these engines produced upwards of 325–375 horsepower and 345–355 lb-ft of torque. How Fuelie Cylinder Heads Launched SBC Performance. 5, which remained through 63 on the "fuleie" heads. If you must maintain a stock looking port, consider our " Undercover Porting ". Check out these Chevrolet double-hump cylinder heads and you'll find out why most are the same but NOT equal! Check out the details, modifications, and tests we run on various types of heads, all. In 1967 the only 327 that was available was the 275 hp version. We've got the two and a half inch outlet exhaust manifolds, the Corvette style ones. Summit Racing™ Cast Iron Cylinder Heads for Small Chevy SUM ">Summit Racing™ Cast Iron Cylinder Heads for Small Chevy SUM. Both versions were the exact same. 030” over 327, flat top pistons, “462” double hump heads with 1. By far, the most iconic Chevy 327 engines were the L76, L79, and L84 versions, the latter of which had primitive fuel injection. This flow improvement will add 15 to 25 horsepower to your engine. It also has a rv cam, headers, and performer intake with a 600 cfm carb. In 1966/67 the 327 became a 275 hp engine with double humps and then from there it all got too. Chevy 461 Double Hump Cylinder Head Comparison. 50 valve sizes in 1967 full size applications. 327 V8 Engine : Engine Facts. Double hump heads, no accessory holes 160 cc runners Corvette 350HP double hump: 327/350: 3917293: 75cc: 1. Check out these Chevrolet double-hump cylinder heads and you'll find out why most are the same but NOT equal! Check out the details, modifications, and tests we run on various types of heads, all. There should be a date code back behind the distributor, near where the bellhousing bolts up. 327 which was ">Spence ☕️ on Twitter: "@MissRobbie76 Original 327 which was. " Short Double-Hump Casting Marks Heads. Shift point will be about 6300. The 375hp/327 fuelie Vette engines ran stock big valve double hump heads w/ about 160+ cc intake ports and approx. 50: 1968-69: 307/327: good HP head used in. In 1962, the 327ci engine in the Corvette was the first small block to offer a 4-inch bore. Chevy 327 V8 Engine : Engine Facts. 5 valves (the 250hp base engine got the pyramid heads with 1. Visually similar to GM casting #3782461, which first appeared on the 1961 Corvette “fuelie” No accessory bolt holes, just like the original heads. 60 valves Standard crank, Weiand Dual plane aluminum intake. A 280 ish cam will be good, I ran the. There were a couple of different cylinder heads, but the most sought out were the “double-hump” heads. The Chevy 327 V8 was first introduced in 1962 and was available with four different horsepower options depending on what type of fuel delivery and performance setup was available. 6 mm) valve diameter high-performance 327 double-hump '186 and 461 heads, pushrod guide plates, hardened. But the newer Vortecs ,,1996 & newer flow better than double humps ,441's,041,etc. Certainly Chevy's later performance heads are better, but the BEST performance SB heads are aftermarket versions. Double Hump Cylinder Head Comparison. " Some of these are also nicknamed "Fuelie" heads because a version appeared. Though it’s using SAE Gross measurements, these engines produced upwards of 325–375 horsepower and 345–355 lb-ft of torque. 50 exhaust while the bottom head is the performance version (325hp and higher) used on 67-68 327 applications with 2. The REALLY sought after heads for 57 283s are the heads for the 2x4 carb engines. sbc heads pair 1 set double hump and 1 set power pack heads 327 needs valve job. Do you have experience with the Chevrolet 327 V8 engine? Let us know in the comments below! Previous Pontiac 400 Engine Guide. Those heads combined with. Chevy SBC Assembled Aluminum Camel …. Intake port volume was 172cc, with the same exhaust at 62cc. 6 valves and the 300hp/327s retained the 1. Casting symbol on exterior face of head is single centered pyramid on square block. Aluminum heads question for my 327. These heads were found on Chevy high-horsepower 302, 327 and 350 CID engines, including the fuel-injected 327s, from which they got the nickname "fuelie heads. 327 Turbo Fire HP questions. , Except for the lack of hardened seats, the early 1. biggest cam for 327 and double hump heads, flat top pistons. I drove it from Michigan all the way to Santa Fe on”. The REALLY sought after heads for 57 283s are the heads for the 2x4 carb engines. 030” over 327, flat top pistons, “462” double hump heads with 1. 73 gears --> If you do highway driving, know your engine will tach high. The bigger heads to follow were the “double-hump” heads championed by the mid-’60s 327 engines. The easiest way to reference any production head is with the last three digits of its casting number. In 1966/67 the 327 became a 275 hp engine with double humps and then from there it all got too crazy. 64CC 461 Double hump heads with 2. First square-port Mark IV head. It was a Corvette ONLY engine, 315hp/283 with FI. Basically, there were two versions of the 461 and 462 double hump heads. 50 valves, Comp Cams XE262 with 218/224 duration @. This cylinder head has the "double hump" casting symbol on the end and are sometimes referred to as "fulie heads" that Dave described. According to MotorTrend, these versions are so called because of the visible ID mark on the sides that have a design with two humps. The 327 two barrel heads aren't good for performance, if you have a factory 4 barrel engine you may have some 'double hump' heads which will be a good bit better. Stock "double hump" heads flow 202 cfm intake and 141 cfm on the exhaust. The top head is the 'lower horsepower' version (300hp and under) used on 67-68 327 applications with 1. Plenty for a lightweight Model A thats not going to be used in competition. original 461 iron heads Improved port/chamber shape for better performance and efficiency Standard port location for. Casting symbol on exterior face of head is the infamous double-hump design. 0% Total voters 4 how much horsepower from a 327 24406 Views 13 Replies 8 Participants Last post by TurboS10 , Feb 8, 2005 L Levis 57 Discussion Starter · Feb 6, 2005 I have a 1966 chevy 327 with double hump heads (1. Spence ☕️ on Twitter: "@MissRobbie76 Original 327 which was. The Chevy 327 V8 was first introduced in 1962 and was available with four different horsepower options depending on what type of fuel delivery and. The "X" casting had the same port configuration; yet, larger intake port volume. In 1968 GM claimed that the 327 produced that year was putting out 250 hp. There was also a fuel injected model that produced 360 horsepower. They had small combustion chambers which keep the compression up, with the leaded fuels then available even average engines ran compression into the 10s like the 300 horse, 327 which used a pretty mild cam and a lot of compression. In 63 a 300hp version was available with double humps but the 250 hp engine was still available until 1965. I just got screwed up on the intake systems on the early 327's is all. For '65 the 327/250 got the 300 horsepower "double hump" heads with no factory increase in rated horsepower. 60" valved -461's in my garage now. I did a full re-build on it port, polished, new pistons, roller cam, double hump original heads rebuild ground up new valves and roller rockers. how to increase horsepower with 327. Rated at 375 hp, the fuel-injected 327. Sep 20, 2004. The VERY FIRST "fuelie" heads with the double hump symbols on the ends of the head, was 1961. com">Chevy 327 V8 Engine : Engine Facts. The double hump heads with the big valves (2. new cam lifters, push rods, valve springs, chrome molly retainers. The Chevy 327 V8 was first introduced in 1962 and was available with four different horsepower options depending on what type of fuel delivery and performance setup was available. Used in 1964 and 1965. The Chevy 327 V8 was first introduced in 1962 and was available with four different horsepower options depending on what type of fuel delivery and performance setup was available. In 1962, the 327ci engine in the Corvette was the first small block to offer a 4-inch bore. Runner volume chart for vintage SBC heads? Old Chevy High ">Runner volume chart for vintage SBC heads? Old Chevy High. The Chevy 327 V8 was first introduced in 1962 and was available with four different horsepower options depending on what type of fuel delivery and performance setup was available. A set of 283 power pack heads,64cc,millions out there,will work great and should give you 9:1 or a little better. I drove it from Michigan all the way to Santa Fe on…". stock Chevrolet steel crankshaft, rotating assemble balanced. Summit Racing™ Cast Iron Cylinder Heads for Small Chevy SUM-152123. Double hump casting also. Period. 194 intake 327ci double hump heads, on a 283? any thoughts. According to MotorTrend, these versions are so called. These heads were found on Chevy high-horsepower 302, 327 and 350 CID engines, including the fuel-injected 327s, from which they got the nickname "fuelie heads. If my memory serves me correctly when the 327 first made it,s appearance in 1962 as a 250 hp engine the markings were a single hump. The bigger heads to follow were the “double-hump” heads championed by the mid-’60s 327 engines. The bigger heads to follow were the “double-hump” heads championed by the mid-’60s 327 engines. "@MissRobbie76 Original 327 which was rare in the Bel Air for a four door. I did a full re-build on it port, polished, new pistons, roller cam, double hump original heads rebuild ground up new valves and roller rockers. 30 over and i was wondering if anyone would know about how much horsepower it will have. The double hump heads with the big valves (2. How to make a stock 1968 327 very fast high performance. From the factory, the Chevy 327 V8 engine had. In 63 a 300hp version was available with double humps but the 250 hp engine was still available until 1965. In 1964, when the solid lifter 327s were increased to 365hp (Holley) and 375hp (FI), the double hump heads got the 2. 43:1 static compression ratio when used with a 0. Avoid 305 heads like the plague, though. Production ended approximately June of 1966 and replaced with #3890462. ( 118 ) Part Number: SUM-152123. We got nearly 400 horsepower and comparable torque from this. These heads were found on Chevy high-horsepower 302, 327 and 350 CID engines, including the fuel-injected 327s, from which they got the nickname "fuelie heads. " Short Double-Hump Casting Marks Heads with short double-hump casting marks were used in later high-performance SBCs. In 1967 the only 327 that was available was the 275 hp version. It seems anyone selling a 327 found it in a Corvette! At least yours is a 327. News that Trick Flow will re-engineer the classic small-block Chevy. Although not all double-hump heads were on fuel-injected engines, many bench racers categorize all camel-back heads as Fuelies. Summit Racing™ Cast Iron Cylinder Heads for Small Chevy SUM-152123. Best cast iron replacement head in my opinion would be a set of 1996 - 2000 Vortec L31 truck heads. Chevy 327 Performance and Upgrades Credit: MotorTrend. What kind of average HP gains can one expect to see by doing some minor pocket porting and de-burring of the casting burrs in the intake and exhaust ports on stock 327/210hp heads. Chevy "Double Hump" Cylinder Heads. Pull one of our dyno session begins with a flat tappet 327 Chevrolet with a period Edelbrock Streetmaster intake and 0-1850 Holley. A high-performance 327 cu in (5. “@MissRobbie76 Original 327 which was rare in the Bel Air for a four door. Double hump casting marks. Also the dual exhaust system was no longer. The better flowing heads of the older units are the 441 castings. These first "fuelie" heads were 3782461 castings and some 461s got an X added. A high-performance 327 cu in (5. 60) were only used on the higher performance 327s (more than 300HP starting 1964). Bill, 350 heads will work on your 327. After doing a little research it looks like in '68 they did reduce back to a 250 HP engine, as well as having the 275. Visually similar to GM casting #3782461, which first appeared on the 1961 Corvette "fuelie" No accessory bolt holes, just like the original heads Heads are sold EACH and come bare (no springs, retainers, rocker studs) Aluminum heads shave 40 lbs. In 1964, when the solid lifter 327s were increased to 365hp (Holley) and 375hp (FI), the double hump heads got the 2. Either of these static compression ratios should work well with the cam I'm suggesting here. The heads you have (462) came along in 66. 1966 is late March introduction. I have a 1966 chevy 327 with double hump heads (1. 327 Block/forged 11. Do you have experience with the Chevrolet 327 V8 engine? Let us know in the comments below! Previous. We've got the finned Corvette style valve covers that will work great on these heads. It's two half-ovals connected by a straight bar-most easily described as "two humps. 1967 327 with Double Hump Heads. The valve size in those heads was 1. net">Building 327 with 325hp. Despite being down on inches to the 350, the 327 Chevy still lays claim to the most powerful production conventional small-block ever produced, the L84. hi i picked up a set a double hump heads the casting number is 3890462 for free but need to be reconditioned. Differences in 250hp and 300hp 327 engine?. Your double hump heads Are most likely a 1. Used on '67-'68 302/327/350cid. Some of those heads actually have the Double Humps, but part of one Hump may be ground down. 469 lift, 670 Holley on a Performer RPM intake, stock exhaust manifolds with a transverse muffler, 4 speed and an 8. MBHD Chevy 250 turbo EFI C Camaros-n-Chevelles Gold Lifetime Member. biggest cam for 327 and double hump heads, flat top …. are these any good and could i get somke help with info like what they were on and sizes also are they worth anything? thanks for any help, chad_48. Chevy Double Hump Heads Specs. With our " Undercover Ported " they will flow 220-230 cfm intake and 165 cfm exhaust. They are also supposed to have the "Camel Back" or "Double Hump" markings, but The markings can be somewhat of a strange thing. Both versions were the exact same casting with the differences only being in machining and valve sizes. Despite being down on inches to the 350, the 327 Chevy still lays claim to the most powerful production conventional small-block ever produced, the L84. I drove it from Michigan all the way to Santa Fe on…”. how much horsepower from a 327. The Standard 327 HP rating in Full Size cars '65 and back is 250 (altho in '65, many if not all, had the smaller Double Hump heads). This engine came from the factory with the 3890462 heads. Unless you are running hard lifters and a low rear end,4:56/4:88 your engine will never use the port size in the 194 heads. 50 inch valves found in the power pack head commpn to the 327 and introduced in 1957 on the 283. Need help Identifying 327 & Double Hump Heads & Holly. The 275 horsepower 327 didn't come out until '66 however there were a couple changes with the '65 250 horsepower 327 which you probably have if it is the original engine. As noted in an earlier article, the double-hump fuelie heads were introduced on the 1962 Corvette 327ci engine that featured the mechanical Rochester fuel-injection system —hence the “Fuelie” reference. The 327 two barrel heads aren't good for performance, if you have a factory 4 barrel engine you may have some 'double hump' heads which will be a good bit better. Maybe you're building a L76 a 365 horse 327 or maybe you're building a 350 horsepower L79 327, we've got all the accessories to fully dress those engines. In 1964, when the solid lifter 327s were increased to 365hp (Holley) and 375hp (FI), the double hump heads got the 2. Rated at 375 hp, the fuel-injected 327. 1967 Small Block Chevy SBC 327 2. 485 232/232 280 isky mega cam in a 327 w/ a 4 speed and 3. Basically, there were two versions of the 461 and 462 double hump heads. “@MissRobbie76 Original 327 which was rare in the Bel Air for a four door. These heads were found on Chevy high-horsepower 302, 327 and 350 CID engines, including the fuel-injected 327s, from which they got the nickname "fuelie heads. The other half of the equation was the cylinder heads. A good site for casting research is Mortec. The 375hp/327 fuelie Vette engines ran stock big valve double hump heads w/ about 160+ cc intake ports and approx. Spence ☕️ on Twitter: "@MissRobbie76 Original 327 which was rare in the. Member. At one time, the heads with the double hump symbol on each end were the ultimate performance head for the small block. They are larger chamber,better ports,& having the larger chambers,, it unshrouds the valves better promoting better airflow. Assembled with 11/32” stainless steel valves, flat tappet springs, spring locators, steel. News that Trick Flow will re-engineer the classic small-block Chevy "double-hump" or "camel-back" cylinder heads in cast aluminum is reviving interest in the original Gen I platform, and is stirring up memories of great engines that were built with those. The most famous heads are the 461 and 462 heads that offer 160-cc intake ports, 64-cc chambers, and 2. The heads you have (462) came along in 66. The 327 two barrel heads aren't good for performance, if you have a factory 4 barrel engine you may have some 'double hump' heads which will be a good bit. Maybe you're building a L76 a 365 horse 327 or maybe you're building a 350 horsepower L79 327, we've got all the accessories to fully dress those engines. 60 Hi Performance Hump Head 3890462 462. It's two half-ovals connected by a straight bar-most easily described as "two humps. As noted in an earlier article, the double-hump fuelie heads were introduced on the 1962 Corvette 327ci engine that featured the mechanical Rochester fuel-injection system —hence the “Fuelie” reference. 4 L) variant followed, turning out as much as 375 hp (280 kW) (SAE gross power, not SAE net power or the current SAE certified power values). There was also a fuel injected model that produced 360 horsepower. valve seals, double roller timing chain, cam lock. The three initial carbureted models produced from 250 up to 340 horsepower. Pull one of our dyno session begins with a flat tappet 327 Chevrolet with a period Edelbrock Streetmaster intake and 0-1850 Holley. 025" piston deck height, a Fel-Pro 1094 head gasket and heads milled for 65cc. 73s, and it had very strong mid range. Runner volume chart for vintage SBC heads? Old Chevy High. Today, 327 fuel injected L84 Corvettes routinely go for more than $100,000 in clean condition. The Standard 327 HP rating in '66 to '67 was 275 (These engines have a Q-J carb). " Some of these are also nicknamed "Fuelie" heads because a version appeared on fuel-injected 327-powered Chevy. You will want to find some with similar size combustion chamber and valve size/port size in order to keep at least the same power output your 327 had when new. Despite being down on inches to the 350, the 327 Chevy still lays claim to the most powerful production conventional small-block ever produced, the L84. Frank Click to expand What he said. You should look into roller rocker arms. How Fuelie Cylinder Heads Launched SBC Performance. The better flowing heads of the older units are the 441 castings. 50" valve double hump heads will run real good on your low compression 327 engine if you want to clean the bowls up some. com">cylinder heads 3890462. Corvette 6 quart oil pan with oil windage tray. Chevy SBC Assembled Aluminum Camel Double Hump 461 Cylinder Head. Spence ☕️ on Twitter: "@MissRobbie76 Original 327 …. An upgrade to a 350 hp 327 cam ( (or equivalent) and a 5-600 Carter or Holley along with some headers and your in the 325+ hp range. Cylinder Head portingAverage HP Gains. Double hump heads, no accessory holes 160 cc runners Corvette 350HP double hump: 327/350: 3917293: 75cc: 1. The "291" head was cast as 3912291 and 3917291. KB155 pistons will give you an 11. I have a 1966 chevy 327 with double hump heads (1. Double hump casting marks. Dyno'd the 327 Last Night. The three initial carbureted models produced from 250 up to 340 horsepower. 194 intake 327ci double hump heads, on a 283? any thoughts ">194 intake 327ci double hump heads, on a 283? any thoughts. In order to maintain the look of a stock 327, Moore elected to retain the 64cc, 461 iron double-hump heads. There were a couple of different cylinder heads, but the most sought out were the "double-hump" heads. 461 heads w/port matching and 9. Though it’s using SAE Gross measurements, these engines produced upwards of 325–375 horsepower and 345–355 lb-ft of torque. Those headers are way big, a 1 5/8 on a 327 is going to be totally fine on a street car. “@MissRobbie76 Original 327 which was rare in the Bel Air for a four door. I know it's impossible to give an exact number, but could I reasonably expect a 10-15HP gain by doing the above?. At one time, the heads with the double hump symbol on each end were the ultimate performance head for the small block. The cylinder heads on top of that engine were the now-famous double-hump heads. Although not all double-hump heads were on fuel-injected engines, many bench racers categorize all camel-back heads as Fuelies. Summit Racing™ Cast Iron Cylinder Heads for Small Chevy SUM. The other half of the equation was the cylinder heads. Depending on the vehicle, the Chevy 327 could make anywhere from 210-375 horsepower and 320-360 lb-ft of torque (SAE Gross). Maybe you're building a L76 a 365 horse 327 or maybe you're building a 350 horsepower L79 327, we've got all the accessories to fully dress those engines. Specs on the engine are 1967 Small journal 327 bored. We got nearly 400 horsepower and comparable torque from this. These heads also featured a double squish/quench chamber. Today, 327 fuel injected L84 Corvettes routinely go for more than $100,000 in clean condition.