gm camshaft identification numbers gm camshaft identification numbers

Don't forget to follow us on Facebook, and if you run a website or write for a blog, please link to our site! Because the camshaft orchestrates the entire valve system, your Chevy won't run properly without it. I was given a can that has the #s If we didnt already know this was an LS cam, the first thing we would want to do is determine the engine family. GM used a forged crankshaft, oil-spray cooled Hypereutectic pistons, and a hydraulic roller camshaft made to handle boost. 2. 52.01.07 Chevrolet "Stock" LS Camshaft. I only put the numbers here that I can prove, so this is a short list. That gives us our first clue where to look for the rest of the numbers. ZL-1, 2nd version, Mark IV3955270.427.692 or 4 bolt3955272.396.692 or 4 bolt3955274.366T68-854-bolt3955276.427T68-734-bolt3963512.427.692 or 4 bolt3963512.454.70-762 or 4 bolt3969852.366T68-844-bolt3969854.396.692 or 4 bolt3969854.402.70-722 or 4 bolt3969858.427T68-844-bolt3999289.454.71-792 or 4 bolt, some "CE" replacement blocks had four bolt main caps3999290.396.68-692 or 4 bolt, Truck3999290.402.70-722 or 4 bolt, Truck3999290.402.722 or 4 bolt, Passenger3999293.366T68-904-bolt3999294.427T68-844-bolt100511074544-bolt, Bowtie, MkIV, 9.8" deck, siamesed bores, 4.25" semi-finished bores, can be bored to 4.50"10069282366T90-914-bolt, Mark IV, Tall deck10069284427T..4-bolt, Mark IV, Tall deck10069286454.90-914-bolt, Mark IV, Short deck10114182454.91-up4-bolt, Gen.V10114183366T91-up4-bolt, Gen.V10114184427T91-up4-bolt, Gen.V10134366454T..4-bolt, Bowtie, Gen.V, Tall deck101850504544-bolt, Bowtie, Gen.V, Short deck10237297454.96-up4-bolt, Vortec 7400", "L-29" Gen.VI10237299427T96-up4-bolt, Gen.VI, 7.0L, truck10237300502.96-up4-bolt, Gen.VI, 4.466" bore12550312427T96-up4-bolt, Gen.VI, 4.250" bore, fuel pump boss, clutch linkage pivot boss12550313454.91-up4-bolt, Gen.V crate motor, Gen. VI 4.25" bare block, fuel pump boss12556110496.01-up4-bolt, Gen.VII 8.1L, "Vortec 8100", Truck12561357454.96-up4-bolt, Gen.VI125613585024-bolt, Gen. VI14015443454.87-902 or 4-bolt, Mark IV, Truck, Motorhome14015445454.78-902 or 4 bolt14044807454T..4-bolt, Bowtie, MkIV, CNC prep, Tall deck, 4.25" bore or 4.495" bores, 191659554541996-2001 L29140968595024-bolt, Gen.V, HO245025044544-bolt, Bowtie, Gen.V, Race prep, 9.8 "short" deck height24502506454T..4-bolt, Bowtie, Gen.V, Race prep, 10.2 "tall" deck height245025724-bolt, 4.5" bore Olds DRCE 2, 9.5" deck height255344024-bolt, 4.590" bore Olds DRCE 3, 9.25" deck height. Any time you are making this kind of important decision about your engine, it's . The 3709 lobe is listed as 265 degrees of advertised duration with 212 degrees at 0.050 and .328-inch lobe lift. I have a new cam was told it was a comp cam # 1136 230780 any ideas on cam specks. With this intake lobe: 0.328 x 1.7 = 0.5576-inch, which COMProunds off to 0.558-inch. back of cam has 660 371079 front of cam has s42008L, i have a 572 hemi and i am in the process of pulling the cam but the harmonic damper is being a pain . The GM tube has the ID number as 3863151 which correlates to a L79 Cam however the stamping at the end is 920883. Communication Number: ServiceManual Trucks Group36 VehicleElectronicControlUnit(MID144)DiagnosticTrouble Code(DTC),Guide Frombuilddate1.2007 PV776-88948891that a fault has occurred by illumination a malfunction indicator lamp and a message in the driver information display, if equipped. The chevy part number for that cam is 3896929. 14088552 Leave a comment at the end of this post if you cannot find the information you want. by Greenlight Mon Nov 10, 2014 6:56 pm. Canadian made ERTEL brand. That gives us our first clue where to look for the rest of the numbers. Now he serves as a regular contributor to OnAllCylinders. Indestructableforce - 6930 is the last four digits of the cam's casting number, 3896930, which also has a horizontal diamond for the casting symbol. Stock GM LS engine cams feature LSA anywhere from 116 to 121 degrees because GM is concerned with creating a very smooth idle. In this case, we dont know what the opening and closing points are although you could compare the intake lobe points to an off-the-shelf XFI RPM Hi-Lift cam and probably be pretty close. I have this in a recent purchase5.3 cast-iron ls engine numbers are256373-18and 32340135Im at a loss..can you please help Jeff?.cheers dave. side, aluminum10185040Bowtie, aluminum, 45cc chambers, 1st version, symmetrical ports, 263cc intake ports, splayed valves10185040Bowtie, aluminum, 45cc chambers, 2nd version, symmetrical ports, 240cc intake ports, splayed valves1020524593350.Gen.II LT1, aluminum, reverse flow cooling, 175/68cc port volumes1020764394-96350.Gen.II LT1, aluminum, reverse flow cooling, 175/68cc port volumes1020889094-96265.Gen.II, L99, 4.3 Liter V-8, cast iron, reverse flow1021533997350.Gen.III, LS1, aluminum, 68cc1022512194-95350.LT5, ZR1, DOHC, 32-valve, drvs. Installing a Timing Belt on Ford Ranger chevrolet image by Eduard Shelesnjak from, Copyright 2023 Leaf Group Ltd. / Leaf Group Media. In 1972, it was the cam for the 307/130hp; and an optional cam for the 350/165hp, 175hp, 200hp; and 400/170hp. They appear to be a rock arms with a small diameter. The HR refers to this as a hydraulic roller camshaft while the 114 refers to the lobe separation angle (LSA). SMALL-BLOCK CAMSHAFTS AND COMPONENTS 3896962 Hydraulic flat tappet Duration @ .050" Lift (deg): I: 222 / E: 222 Maximum Lift (in) w/1.5 rocker*: I: .450 / E: .460 Lobe Centerline (deg): 114 Used in 350-/290-HP crate engine 24502476 Hydraulic flat tappet Duration @ .050" Lift (deg): I: 212 / E: 222 Maximum Lift (in) w/1.5 rocker*: I: .435 / E: .460 Show More Show Less. *54-55 passenger W/PG, 56-58 passenger. Crane makes Blueprint camshafts for almost, if not, every GM, Ford, Mopar engine from the sixties and seventies. Only show this user. I have no idea whats on the inside. Below is some reference data for cylinder head casting numbers with valve sizes, years used, etc. My buddy says its a mild cam thats bigger than a stock LS6 version, but he didnt have any more information. It models the airflow for the computer to calculate fuel. . It's a used cam and it has this barcode on it. Re: camshaft identification. How does this compare to the 69 dz 30/30/ cam? exhaust valves. Can you tell me the specs on this cam from these numbers? I can't help you in regards to who actually did the final grinding. The last 3 digits of the number of the CASTING is frequently very close but not the same as the PART number of the camshaft assembly. If you are looking for the actual Chevy engine codes that are stamped into the block during assembly, Nasty Z-28.com has an excellent block stamping number decoder. There following are ways you can tell a difference: As the name implies, these sets of numbers reveal the model of the camshaft. Used on RPO: L86 (1980-1991). . CAMSHAFT SPECIFICATIONS Part No. From the distribute drive gear down are the folloing markings: CWC, 06, C14, EP1. It would take some digging and some research, but you could look through a parts catalog of some of the more popular cam manufacturers and see if you can match up part numbers with something. A roller camshaft has the valve opened faster and remains at a higher lift for a certain time; it allows more airflow and more power, which reduces wear. The HI-PO color coded stripes on the camshaft end are green, orange and red. On the home page, we looked for the Information tab and then clicked on Catalogs. A camshaft is a rotating object in a vehicle with pointed cams in which its rotations produce reciprocal motion. The next information engraved on the cam was HR 114. In 1967, it was the cam for the 283/195hp; 327/210hp, 275hp, 300hp; and 350/295hp. First Generation Camaro Info and Tech - 1967-1969. All of these applications had the same specs as the initial 1967 application. engine P/N 10185058. There are many numbers and terms used to describe the design of the camshaft and it's important to know how these numbers will affect the performance of your engine. Does OnStar Keep Location History? $510.45. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. (Yes or No). The LEA is an engine produced by General Motors for a wide variety of compact and midsize vehicles. The exhaust number also comes through some time, maybe if you see digits like 266/288; the second shows the exhaust number. Also a great fitting cam for the earlier 302 or 327 Solid lifter Hi-Po motors used by Corvette, Nova or Camaro. They are the flat tappet and roller camshaft. Thanks for any info I Think its a crane cam but I cant match the stamped numbers anywhere. Speed isnt a problem with a dual camshaft and it increases the engines power. This will help you get the full details directly from the manufacturing, which requires the model and other factors that need attention. In 1971 he installed a 1965 Corvette fuel injection system. They include: The essence of knowing how to identify your camshaft makes it easy to avoid errors, unnecessary bills, and frustrations that come along with having the wrong camshaft. I have gone though the list of things to look for on the CC cam that came with a motor I picked up, but have not had much luck, so Im asking Jeff to have a look. And there is a CR inscribed as well off the lower left 1 BTC 42 ABC 223 30 BTC 80 ABC 290 .298 .447 114 1.5 HYD EXH. Indestructableforce - 6930 is the last four digits of the cam's casting number, 3896930, which also has a horizontal diamond for the casting symbol. This type allows more direct airflow through the engine without having to deal with obstruction. Visit www.jamsionline.com to shop today. Discussion in 'The Hokey Ass Message Board' started by indestructableforce, Nov 13, 2012. Rear cam bearing journal is etched/engraved Fessler Killer Cams #38 Any info is appreciated. They provide average torque to the valves. Many camshaft number reference sites exist online for V8 engines, but determining the camshaft specs for six- and four-cylinder engines may require contacting a Chevrolet parts department. 1954-1955 235 Engine 3835913; 1956-1962 235 Engine 3836848; 1956-1962 261 Engine 3836850 This method requires you to do a few tasks like measuring some diameters and comparing them to the database. The Fora platform includes forum software by XenForo. Chevy V8 SBC Block and Head Casting Numbers. A native of New Haven, Conn., Floyd Drake III began writing in 1984. GM is recalling seven. The cam is in very good used condition and will likely be reused. I can quote you the numbers from the 1964 "Parts and Accessories Catalog" but, be aware that earlier numbers may exist and be superseded by the ones listed in this catalog. I have a 1969 z28 I bought a few years back from a friend who was orig owner. COMPCams uses two-number designations for all its engine families. The LS . . Smith began writing for Car Craft magazine in 1979 and became editor in 1984. In 1969, it was the cam for the 307/200hp; 327/210hp, 235hp; and 350/250hp, 255hp, 300hp. i have removed camshaft welsh plug to see numberbut cant identify numbers help would be appricated.i nee to see what size converter i would need. I purchased a used hydraulic roller camshaft from a friend that was originally used in an LS1 engine. The GM Generation I and Generation II (LT) engine families are both derived from the longstanding Chevrolet small block V8.The Generation III small-block V8 was a "clean sheet" design, which replaced the Gen I and Gen II engine families in 2002 and 1995 respectively.. Like the previous two generations, the Buick and Oldsmobile small blocks, the Gen III/IV can be found in many different brands. [] Ask Away! In this case: 108 + 116 = 224 degrees / 2 = 112 degrees. item 7 1957-1963 Corvette Camshaft GM 3736098 Solid Lifter 283 Sp Hi Perf 327/340 360hp 1957-1963 Corvette Camshaft GM 3736098 Solid Lifter 283 Sp Hi Perf 327/340 360hp. It helps you know the compatibility of the camshaft to the supposed vehicle you want to use it for. 4485B 4391B HR112+4 R (with a line under the R ) then CC and at the bottom G1979-14. Now zero the indicator and turn the engine backward until the dial indicator reads roughly 0.100-inch. I have a cam trying to set startup timeing hr112 intake hyd .555 ext .576 duration .006 valve tapping lift 287 in 293 ex valve timing .050 open int 10 close btdc46 abdc exh :57 BBdc 5 ATC. You can make a sure bet by just selecting randomly but your engine life will be in big problem. In 1998, head c/n 24575507 arrived with a heart-shaped combustion chamber against a D shape. For the intake centerline method, once the cam is installed and TDC is established on the degree wheel, then roll the cam around until the dial indicator signals maximum lift. Each number has a meaning and an interpretation. 210/218 at 0.551/0.556 at 113 degrees . I know that Chevy Casting Numbers are on several sites on the World Wide Web but I thought it would be a good idea to list them here too. A Guide To Ford V8 Engine Block Casting Numbers, 1952-1996. The markings on end of cam is 300C6 and X6733. While these engines were based on the GM Family II engine, the architecture was substantially re-engineered for the new Ecotec application produced since 2000. We continued down the list until we found the 3709 number, which because it is listed first on the camshaft, is the intake lobe. For a better experience, please enable JavaScript in your browser before proceeding. We continued down the list until we found the 3709 number, which because it is listed first on the camshaft, is the intake lobe. Sept. 2019 Drag-Week Winner - N.Y. Legal Streeter - 1956 Chevy Bel-Air, http://www.msnusers.com/Chrisjunque/shoebox.msnw?action=ShowPhoto&PhotoID=2. Inc. Lee's Summit MO. There are two types of cams that you can tell the difference without using a lens or going the extra mile to tell the difference. The Chevy orange will appear as new for decades.Gear shifting is accomplished with a rebuilt 1960's HURST Competition Plus shifter specific to the C2 Corvette w/Borg Warner which is extremely rare.Ignition is handled by a computerized multiple spark discharge controller providing instantaneous throttle response by way of multiple sparking at . If I rotate the camshaft the other side has markings of AO, D14. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. The Chevy part number for that cam is 3896929. With over 35 years of experience in automotive machining, you will not find a more trustworthy and reliable source of parts. There are 3 different ways to select your camshaft tightly. In 1974, it was the cam for the 350/145hp, 185hp, 195hp; and 400/150hp, 180hp. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Terms of Service. The specs you have listed above for that 115835 part number is correct, the L/S is 109* instead of 110*. How to Turn off Daytime Running Lights (Explained), How to Turn Off Headlights While Car is Running. For instance, the Duntov cam has a GM part number 3736097 but cast into the camshaft is the number 3736098. The recall affects several models of heavy duty Chevrolet Silverados and GMC Sierras with optional engine block heaters. I tried searching & googling these markings with no luck. Their outer look tells the difference. i have removed camshaft welsh plug to see numberbut cant identify numbers help would be appricated.i nee to see what size converter i would need.numbers on cam end are z102 and also 14p. In 1973, it was the cam for the 307/115hp; 350/145hp, 175hp, 190hp; and 400/150hp. On this cam card, you will see the LSA is 112 degrees. Remove the camshaft from the engine if necessary. intake and 1.72 in. Any advice? In 1973, it was the cam for the 307/115hp; 350/145hp, 175hp, 190hp; and 400/150hp. no idea) and only pulls about 10psi vac at idle. $426.78. Do You Get a Ticket in the Mail for Passing a School Bus? To Develop Good Eye Habits While Driving You Should? My 1968 Camaro Site. $850.12. Chevy Intake Manifolds Manufacturer Part Number. Required fields are marked *. The EP1 (not EPI) indicates that it was cast for Engine Power Components. Anyone know whos cam this is. The specs you have listed above for that 115835 part number is correct, the L/S is 109* instead of 110*. 25-12. Any info helps, or where I can find. A forum community dedicated to 1st generation Chevy Camaros owners and enthusiasts. Cam is in used shape but with little to no wear. Under that heading toward the bottom we found a tab for the Cam Lobe Master Catalog. The Chevrolet small-block engine is a series of gasoline-powered, V-8 automobile engines, produced by the Chevrolet division of General Motors between 1954 and 2003, using the same basic engine block.Referred to as a "small-block" for its size relative to the physically much larger Chevrolet big-block engines, the small block family spanned from 262 cu in (4.3 L) to 400 cu in (6.6 L) in . The duration at lash point in degrees (intake/exhaust) is 328/324; duration at .050" tappet lift (intake/exhaust) is 220/220; and . A 'VE Table' is one of two methods used to control fuel delivery, typically the secondary method with the primary being a MAF (Mass Airflow Sensor). (Yes or No). Vortec truck, Gen.I crate motors and ZZ4, roller cam, one piece rear seal: 12550592 : 97-up : 350 : crossbolted block, Gen.III, LS1, aluminum: 586 FM13 216 00L 1991 Z28 Engine: '94 355 LT1, GM hot cam, 1.6 RR's, Ported Heads, Dyno Don's headers, #30 SVO injectors, stock internals with skirted pistons. p/n 12560967, .466/.457, 191/190, 114 LSA. Getting a camshaft can be a burden on many car owners; it works well when you have the right one. The pushrods cam stays above the cylinder, which is always above the combustion chamber. Also there is a Blue dot just under the distributor drive gear. Anyone have any idea what make and specs are of this cam? Thanks, Mike. It means the valve is open at 255 degrees. 330864: 1968 through 1991 oval port, open chamber, 2.06 in. This requires a little more time but COMP does not charge extra, which is a great service if you are into tweaking the cam a bit to do something special. CAST3736098. motor could have casting number 10112391 or 10112391S that is the service replacement. A stamp is not a functioning part of a camshaft. This was one of the best selling/most popular cams through the years past! 0967 is the last four digits of the GM part number. PERFORMANCE PARTS | My great WordPress blog. In 1975, it was the cam for the 350/145hp, 155hp, 165hp; and 400/175hp. The 3709/3711 numbers are references to lobe designs. If the number was 110 degrees, this would increase the amount of overlap. We found it under the heading of Xtreme RPM for LS1 lobes, Hi Lift. No smoke, but I have not checked compression yet. When referring to LSAs, the larger the number, the more degrees of separation between the intake and exhaust lobes. This an original 1966 283 camshaft casting number is 3732798, hydraulic lifters. Hey. Thanks, Gary in N.Y. P.S. The numbers are just figures a manufacturer uses to identify their products and to track them sometimes. Each family of cam lobes has its own numerical designation with the same basic configuration, usually encompassing multiple individual durations that also might include changes in lobe lift. Thank you ,This has been very helpful. They are not flat, and they are recognized with a slight crown on the face. The next two numbers are the valve lift of . Camshafts come in a wide array of variations, and Chevrolet has a range of camshafts for different applications, engine sizes and performance specs. Good Day: In 1974, it was the cam for the 350/145hp, 185hp, 195hp; and 400/150hp, 180hp. Using stamped numbers and. Quick View. This is what is on the cam, it would not let me past a picture here. COMP Cams 12-600-4 Thumpr Cam, Small Block Chevy, 2000-5800 RPM. Looking for 4311-4314-r106 Q 7388-04 CAN ANYONE TELL ME WHERE I CAN LOOK THE SPECS UP! Then do the same process with the lobe at 0.050 on the closing side. It is 8 figured random numbers and sometimes 9 figures with the last 4 numbers identifying the specific function of the Cam Shaft. Looks to have stock cast iron heads and exhaust. 14010280 Small Block V8 1979-1982 267, 2 bolt 14011064 Small Block V8 1983 350, 4 bolt 14011148 Small Block V8 1987-1989 350, roller cam, 1-piece rear seal 14016376 Small Block V8 1979-1982 267, 2 bolt 14016379 Small Block V8 1977-1979 350, 2 bolt or 4 bolt 14016381 Small Block V8 1980-1984 305, 2 bolt 14016382 Small Block V8 1979-1984 305, 2 bolt The easiest way to tell the difference is to check the 8th digit of the Vehicle Identification Number (VIN) on the original vehicle. .390 .410 310 320 1.50 In 1968, it was the cam for the 307/200hp; 327/210hp, 250hp, 275hp, 300hp; and 350/295hp. However, remember what to do after replacing your camshaft sensor in your car to avoid another frustration. side, aluminum1010617990350.LT5, ZR1, DOHC, 32-valve, drvs. How to Catch Someone Putting Nails in Your Tires (5 Best Ways), Method 2: You can Identify with Stamp Numbers, what to do after replacing your camshaft sensor in your car. Why are Volkswagen Oil Changes so Expensive? Hope weve helped you with a little more camshaft knowledge. Chevy LSX454 Camshaft. I have a Street Performance comp cam that was purchased in 2007. Stamped on end is Z099, also has three pink dots above that stamping. 4226 what kind of camshaft is it. The 4 digit ID on the camshaft core is 1529, which if correct I believe is for a 327 engine. (See below.) These spec are for cam install @108 intake ctr line duration @.050 intake 236 ext 242 lobe lift .3470in .3600 ext lobe selection 112.0 where do I set my timeing for first start ? Also can i safely run the Xtreme Energy, XR294HR on my 383 Vortec 906 heads and screw studs ? Step 1 Find the model prefix. side, aluminum1022512295350.LT5, ZR1, DOHC, 32-valve, pass. Add the two numbers together and divide by 2. Compare Related Articles. The Fora platform includes forum software by XenForo. JavaScript is disabled. Thank, Ray. I actually went through several lists and made some corrections before making this list. Can Jumpstarting a Car Damage the Alternator? It is a mode of identification used by manufacturers. Less overlap generally produces a more stable idle while more overlap makes the idle lumpier. They are widely used and they perform well, which is more affordable than a roller cam. Thank you, if you can help, send me an e mail and I will send you a picture. CAM 6930 1967 CAMSHAFT ID. diameter In 1967, it was the cam for the 283/195hp; 327/210hp, 275hp, 300hp; and 350/295hp. For instance, if you have numbers like 266H04, the last two digits are the numbers used to show the measurement of the lobes. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Camshafts Melling offers a full line of OE replacement camshafts for cars, light duty, medium duty and heavy duty trucks. What Happens When the Turbo Goes on a Diesel? Run-out on. The only thing we dont know from these number is the cams intake centerline. It doesn't indicate a different cam or an earlier or later version. Despite the differences, however, an 8.1L camshaft will drop right into a 454 like it belongs there - but it will only run four cylinders. The block casting number on smallblock and big block Chevy V-8 motors is located on a ledge found at the rear of the block, most often on the driver's side. In 1971, it was the cam for the 307/200hp; 350/245hp, 270hp; and 400/255hp. It is typically located in the center of the cam between the lobes. The lobes are also listed with various theoretical valve liftsthe one were interested in would be the LS1s 1.7:1 rocker ratio that delivers 0.558-inch of lift. A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. After working as a reporter in Oregon, he is now based back home in New Haven. 330864..68-84ovalOPEN396, 402, 366T, 427T, 454 Truck330865..68-84ovalOPEN396, 402, 366T, 427T, 454 Truck330866..68-78ovalOPEN366T, 427T330867..68-73ovalOPEN427T336765..68-78ovalOPEN427T336768..73-76ovalOPEN427T336781..73-85ovalOPEN454, 118cc chamber, 256/114cc ports343771..68-86ovalOPEN366T, 427T, 454343772..68-86ovalOPEN366T, 427T, 454343783..70-76ovalOPEN454 Truck346236..75-87ovalOPEN454, 120cc chamber, 225/116cc ports352625..70-76ovalOPEN454 Truck353049..73-84ovalOPEN454, 122cc chamber, 255/119cc ports366765..74-78ovalOPEN427T473328..68-69ovalOPEN366T3856206.65-66oval..CLOSED..396, 97cc chamber3856208.65rect..CLOSED..396/425hp, 109cc chamber 396/375hp "Z-16" Chevelle3856213.66-82oval..CLOSED..366T, 427T3856260.68oval..CLOSED..396 Truck3872702.65-66oval..CLOSED..396, 427, 98cc chamber3873858.65-67rect..CLOSED..396, 427, 109cc chamber3876875.77-85ovalOPEN427T3904390.67oval..CLOSED..396, 427, 98cc chamber3904391.67rect..CLOSED..396, 427, 107cc chamber3904392.67rect..CLOSED..427, Aluminum, L88, L89, 107cc chamber3904393.68-76ovalOPEN366T3908952.67ovalOPEN427, "M.Truck", Marine3909802.67oval..CLOSED..396, 427, 101cc chamber3917215.67-68oval..CLOSED..396, 427, 101cc chamber3917219.68-85ovalOPEN366T, 427T3919840.67-69rect..CLOSED..396, 427,107cc chamber3919842.68-69rect..CLOSED..396, 427, Aluminum L88, L89, 107cc chamber3931063.68-69oval..CLOSED..396, 402, 427, 101cc chamber3933148.69-84ovalOPEN'69 396/265hp, 366T, 427T, 112cc chamber3933149.68-76ovalOPEN427T, 122cc chamber3935401.68-76ovalOPEN427T3946074.69&71rectOPEN'69 427 L88, ZL1, Aluminum, 118cc chamber '71 454 LS6, "round exhaust port"3964290.69-70oval..CLOSED..396, 402, 427, 454, 101cc chamber Large or small hex spark plugs used3964291.69-72rect..CLOSED..396, 402, 427, 454, 109cc chamber, Large or small hex spark plugs used, crate motor usage in years after 1970.3965198.68-69oval..CLOSED..396 Truck3975950.68-70ovalOPEN396, 402 Truck, 366T, 427T3986133.68-85ovalOPEN366T, 427T, 454 Truck3986135.69-73ovalOPEN366T, 427T3986136.68-84ovalOPEN366T, 427T, 454 Truck3993820.71ovalOPEN402, 113cc chamber, 255/114 ports3993820.71-84ovalOPEN454 Passenger and Trucks, 113cc chamber, 255/114 ports3994026.71rectOPEN454 LS6, 118cc chamber3999241.72ovalOPEN402, 454, 113cc chamber, 6272292.70-78ovalOPEN402, 4546272990.70-uprectOPEN454 service replacement, used on some MKIV crate engines, 118cc chamber10045427..rect.Pontiac/Chevy Aluminum, 91cc chamber Large Port, race10049875..rect.Pontiac/Chevy Aluminum Small port, race10051128..rect.Bowtie, Aluminum 72cc chambers Symmetrical ports10051129..rect.Bowtie, Aluminum "raw" casting, Symmetrical ports10052902..ovalOPENMkIV, 427T1010114091-upoval..CLOSED..Gen.V 366T, 427T1011415691-upovalOPENGen.V & VI 454, 118cc chamber1014127996-upoval..CLOSED.."Vortec 7400", 100cc chambers1048705277-90ovalOPEN366T1236339196-upovalOPENBowtie, Aluminum, Signature Series, fits MKIV, Gen.V, Gen.VI, 110cc chamber1236340196-uprectOPENBowtie, Aluminum, Signature Series, fits MKIV, Gen.V, Gen.VI, 118cc chamber1255816201-upoval..CLOSED..Gen.VII,"Vortec 8100", 8.1L, 496, truck1256024198-upoval..CLOSED.."Vortec 7400", 100cc chambers1256293291-95ovalOPENGen.V, truck crate motor, 118cc chambers1256293391-95ovalOPENGen.V, 118cc chambers1256293400-uprectOPENGen.VI 502 Marine1401107769-uprectOPENAluminum, fits MKIV, "C-port" 118cc chamber, also sold as a "solid" head1404486184-96rect.Bowtie, Aluminum, MkIV, "raised runners", 1st design, 105cc chamber1404486196-uprect.Bowtie, Aluminum, Signature Series, fits MKIV, Gen.V, Gen.VI "raised runners", 2nd design, 115cc chamber1404486184-96rect.Bowtie, Aluminum, MkIV "raw" casting of "861" MKIV 1st design1408104578-87ovalOPEN4541408105285-87ovalOPEN366T, 427T, 454 Truck, Marked "HiPerf"1409235986-90ovalOPEN366T, 427T, Marked "HiPerf"1409236086-90ovalOPEN454 Truck, "peanut" round ports1409618870-71rectOPEN454 service replacement, also used on later Mark IV LS-6, LS-7 and 454 HO crate motors, 116cc chamber1409708891-uprectOPENGen.V 454/502 HO, 118cc chamber2450258597rect.Olds/Chevy, DRCE 2, Pro Stock aluminum, for blocks w/4.900" bore spacing2553440404rect.Olds/Chevy, DRCE 3, Pro Stock, aluminum, for blocks with 4.900" bore spacing, Oval includes both "peanut" (also called "round") ports and large oval ports, Copyright EngineRepairShop.com 2011-2023 Privacy Policy Disclaimer.