COMP Cams Cam Series - COMP Cams ** Free Shipping for Engines & Transmissions* Learn More; 0; 888.284.7491 . 285/300hp, 64cc chambers, 1.94"/1.5" valves1401441580-85267/3051401441680-86305.1.84"/1.5" valves, 58cc chambers1401444080305.1.84"/1.5" valves1401982180-863501401992479-812671401992680-863501401051680-86350140205178035014020555813051402055681350140220568535014022206803501402230180-863051402260180-86267/3051.72"/1.5" or 1.84"/1.5" valves, 53cc chambers1402280180-8630514024816..350.76cc chambers, 1.94/1.5 valves, Gen.I crate motors1403480678-822671403480778-863051403480880-863501403480896-up350.76cc chambers, 1.94"/1.5" valves, Gen.I Goodwrench crate motors1403481080-86350.Truck1403481180-86350.Truck1403912181-86305.Truck1403912281-86305.Truck1407111480-863501407538180-86350.Truck14079261863501408584480-86350.Truck140859638635014088526..350.Gen.II, LT1, aluminum1408911986-883501409409386-883501409621780-96350.Crate motor, 285hp/300hp, 64cc chambers, 72' or 90' center intake manifold bolt angles1410108187-953051410108387-up350.Gen.I, also used on crate motors, 285 or 300 hp, 64cc chambers, 72' center manifold bolt angles1410112886-87350.Aluminum, 58cc, angle plug1410218787-91305.1.84"/1.5" valves1410219187-up3501410219387-up350.1.94"/1.5" valves22542525Dart/Olds/Chevy aluminum, 14'or 17' race head.2450255996-97.Bowtie, "SB2", 1st version, "mirror ports", aluminum, 196cc port, CNC version 280cc port, 38cc chamber25500141Buick/Chevy aluminum, 10' race head, 42cc chambers, symmetrical ports, 235cc intake port volumes, 2.1"/1.625" valves25534351C..04-up.Gen.I Bowtie, cast iron Vortec head, 175/65cc ports, 2.00/1.55 valves, "small port head"25534371C..04-up.Gen.I Bowtie, cast iron Vortec head, 206/77cc ports, 2.00/1.55 valves, "large port head"3341736990-up350.Gen.I Goodwrench crate motor,"Hecho en Mexico", 76cc, 0-3267114-bolt, Alum., CanAm, 4.44" bores, steel cylinder liners340220..427T68-854-bolt345014..454.70-86346236..454.75-762-bolt359070..454.70-90361959..454.73-902 or 4 bolt364776..427T68-854-bolt364779..366T68-904-bolt399204..509.70-714-bolt, Alum., CanAm, 4.5" bores, steel Cylinder liners399293..366T77-784-bolt473478..427T77-904-bolt495102..4-bolt, Alum., CanAm, 4.5" bores3782870.427T68-764-bolt3824553.366T66-674-bolt3855961.396.65-662 or 4 bolt3855961.427.662-bolt3855962.396.65-664-bolt3855977.366T66-734-bolt3869942.427.66-672 or 4 bolt3902406.396.672 or 4 bolt3904351.427.672 or 4 bolt3904354.366T66-764-bolt3916319.366T684-bolt3916321.427.682 or 4 bolt3916323.396.682 or 4 bolt3925521.427T68-854-bolt3935439.427.68-692 or 4 bolt3935440.396.68-692 or 4 bolt3937724.366T68-854-bolt3937726.427T68-844-bolt3946052.427.694-bolt, Alum. In 1998, head c/n 24575507 arrived with a heart-shaped combustion chamber against a D shape. Other examples include small block Chevys -12, big block Chevys -11, and 5.0L small block Fords -35. Only thing is the idle mixture screws have little effect (oh no timing pointer either on order) so cant really tell timing. Chevy Casting Number identification - Block casting numbers indestructableforce - 6930 is the last four digits of the cam's casting number, 3896930, which also has a horizontal diamond for the casting symbol. 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. They are the flat tappet and roller camshaft. A good understanding of these factors will assist you in making a wise decision. Show More Show Less. JavaScript is disabled. The Chevy part number for that cam is 3896929. camshaft identification | Hot Rod Forum Mon to Fri: 8am - 5pm CDT; Gandrud Chevrolet 919 Auto Plaza Dr. Green Bay, WI 54302; Sales: 888.284.7491 performance@gandrud.com; Contact Us; Connect With Us I bought a 34 Ford pickup with a 302 installed. Apr 19, 2020 Just to be clear, are those the numbers on the face of the cam behind the timing gear? 1130.327.forged..mediumjournal3.25" stroke1178.302.forged..medium journal3.00" stroke1181.305,350cast.medium journal3.48" stroke1182.350.forged..medium journal3.48" stroke2680.327.forged..small journal.3.25" stroke2690.350.forged..medium journal3.48" stroke3279.302.forged..medium journal3.00" stroke3474.283.forged..small journal.3.00" stroke, military tank use4577.327.forged..small journal.3.25" stroke4672.327.forged..medium journal3.25" stroke310514..350.cast.medium journal3.48" stroke330550..350.cast.medium journal3.48" stroke354431..262.cast.medium journal3.10" stroke3727449.283.forged..small journal.3.00" stroke3729449.265.forged..small journal.3.00" stroke3734627.327.forged..small journal.3.25" stroke3735236.265,283forged..small journal.3.00" stroke3735263.283.forged..small journal.3.00" stroke3782680.327.forged..small journal.3.25" stroke3814671.327.forged..small journal.3.25" stroke3815822..265,283,302.forged..small journal.3.00" stroke3835236.283.forged..small journal.3.00" stroke3836266.283.forged..small journal.3.00" stroke3848847.283.forged or cast..sm. I suspect you have . 1991 and later Gen.V, VI and VII production BBC motors have one-piece rear main crank seals. In 1974, it was the cam for the 350/145hp, 185hp, 195hp; and 400/150hp, 180hp. The exhaust number also comes through some time, maybe if you see digits like 266/288; the second shows the exhaust number. Gen III/IV LS Engine ID Guide - Speedway Motors This advances the intake centerline by that number of degrees. 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. It has a taper inside the lobe which ensures the lifter can spin. First Generation Camaro Info and Tech - 1967-1969. The recall affects several models of heavy duty Chevrolet Silverados and GMC Sierras with optional engine block heaters. Camshafts Melling offers a full line of OE replacement camshafts for cars, light duty, medium duty and heavy duty trucks. With over 35 years of experience in automotive machining, you will not find a more trustworthy and reliable source of parts. 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. 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. Camshafts come in a wide array of variations, and Chevrolet has a range of camshafts for different applications, engine sizes and performance specs. The numbers engraved in the body part of the camshaft are called the Stamped number or casting number. 4. Each code will be represented by the SES light flashing, pausing Step 2 Find the profile or grind number. In 1970, it was the cam for the 307/200hp; 350/250hp, 300hp; and 400/265hp. Chevy V8 BBC Block and Head Casting Numbers. 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). So why did this cam not have a lope to it in the 283, from everything I am reading long . 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 Quick View. Ford 1970 Kansas Cars for sale - SmartMotorGuide.com 4270 H11 then letters CC vertically, then CB6554 can you tell me the specs on this cam? Step 2 Locate the ID number on the camshaft. This is a COMP Cams timing card. This hydraulic flat tappet "454" is a good street high-performance and marine cam used in the Gen V 454 H.O. Technical Articles - SBC Block Casting Numbers - Bzerob.com Personally, I would trash the cam and go buy a new cam and lifter set that you know what the grind is. The Vehicle's Service Parts Identification Label Will Have The VIN Digit and Engine RPO Code (Circled) To Confirm Engine Application Gen III LS Engine Car Applications 1997 to 2004 Corvette, 1998 to 2002 Camaro & Firebird, 2004 GTO: 5.7L LS1 2001-2004 Corvette, 2004-2005 Cadillac CTS-V: 5.7L LS6 Gen III LS Engine Truck Applications: Stamped on end is Z099, also has three pink dots above that stamping. Knowing the measurement of a lobe separation angle is another special way of telling the difference between camshafts. Match the number to a Chevrolet camshaft part number listing. The 8.1L FO is 1-8-7-2-6-5-4-3 where a 454/7.4L is 1-8-4-3-6-5-7-2 as seen in Figure 1. (Yes or No), Will Hub Centric Rings Stop Vibration? The HI-PO color coded stripes on the camshaft end are green, orange and red. Can You Register a Car with a Bill of Sale and No Title? I tried searching & googling these markings with no luck. If you have ever heard that the new style 235 gets better compression numbers with an "848" Head, look for the last three numbers of that Casting Number. This sometimes is tagged stressing when you can just tell by looking at numbers, but in the absence of a degree when or dial indicator, an analog is required to make your best decision. In 1975, it was the cam for the 350/145hp, 155hp, 165hp; and 400/175hp. Grind numbers are HR 224/339. 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. p/n 12560967, .466/.457, 191/190, 114 LSA. A camshaft is a rotating object in a vehicle with pointed cams in which its rotations produce reciprocal motion. On this page you will be able to look up the original part numbers for 1958-1965 348 and 409 Chevy engine components such as Bell Housing, Carburetor, Camshaft, Crankshaft, Distributor, Generator/Alternators, Radiator Hoses and Starters. These markings will usually be in the center of the camshaft, obviously in between the valve lobes. If we didnt already know this was an LS cam, the first thing we would want to do is determine the engine family. CWC is the casting ID for CWC Textron. The duration at lash point in degrees (intake/exhaust) is 328/324; duration at .050" tappet lift (intake/exhaust) is 220/220; and . This is an involved process, requiring the removal of the engine's front end. $510.45. Reference: Chevy Engine Block Casting Numbers - Chevy Hardcore Camshafts are identified by (usually) the last 4 digits of the part number and a casting symbol. The 3709 lobe is listed as 265 degrees of advertised duration with 212 degrees at 0.050 and 0.328-inch lobe lift. Contact. The greater number of degrees means there is less overlap between the intake and exhaust lobes. Camshaft identification | Hot Rod Forum 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. CHEVY CASTING NUMBERS - enginerepairshop.com I have this small block chevy the guy says is a 418 strocker a lifter lifted off at the track but now im looking at the cam and all it has on it is a S then another set of numbers is CH2 ..its a roller set up lifter ar comp cams and so is the rockers but i have no cam spec with car when i got it so im lost . Can a Wheel Speed Sensor Cause Limp Mode? We found it under the heading of Xtreme RPM for LS1 lobes, Hi Lift. Chevy . What are your thoughts on the #5054 or anything else? No smoke, but I have not checked compression yet. side, aluminum1017439091-95350.LT5, ZR1, DOHC, 32-valve, pass. The engine also had smaller 1-1/8? How to Turn off Daytime Running Lights (Explained), How to Turn Off Headlights While Car is Running. 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. The best way to identify an unknown camshaft is by identifying it with your eye or using stamped numbers engraved on the camshaft to identify it. 52.01.07 I can't help you in regards to who actually did the final grinding. Chevy Cam Part Number Location Chevrolet Big Block Camshaft Types Chevrolet installed Three different types of Camshafts on the Big Block Engines. Camshaft Guide for Small-Block Chevys: How-To, Tips & Techniques A Solid Lifter Camshaft for 1970 1971 and 1972 Camaro Z28 or Corvette with the 350 LT1 Small Block Motor. 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. It is typically located in the center of the cam between the lobes. When referring to LSAs, the larger the number, the more degrees of separation between the intake and exhaust lobes. Any info helps, or where I can find. E.g. CWC is the foundry that cast the cam blank. Can you guys help me pick a cam and fix my combo? Example: 63402A-2 enter 63402A Cam is in used shape but with little to no wear. I did a search as well, google and on here. A DOHC is known as a dual overhead cam. Any help much appreciated. This type allows more direct airflow through the engine without having to deal with obstruction. Understanding Cam Design. Also a great fitting cam for the earlier 302 or 327 Solid lifter Hi-Po motors used by Corvette, Nova or Camaro. The Fora platform includes forum software by XenForo. It's for a 99-04 truck. Then do the same process with the lobe at 0.050 on the closing side. 366298.4Bowtie, Aluminum, billet main caps, 3.398" bore with sleeves, two piece rear main seal. On the shaft the #'s 1539 are stamped in one spot, and CWC is stamped in another spot. Ask Away! with Jeff Smith: How to Decode a COMP Cams Camshaft Thanks, Mike. Why are Volkswagen Oil Changes so Expensive? GM used a forged crankshaft, oil-spray cooled Hypereutectic pistons, and a hydraulic roller camshaft made to handle boost. The only stamped markings on the front are 951758. Thanks, Your email address will not be published. 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. Their outer look tells the difference. In the catalog, you will see the cams listed by configuration starting with flat tappet hydraulics and then hydraulic rollerswhich is what we want. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Every engine needs a timing device that can control the opening and closing of the intake and exhaust valves. i have a 383 chev engine ibought and would like to know what cam is in it. I have a cam I need to Id I need the specs and if its a solid or hydraulic its a ua9450 a4250h11 can someone help me with this I am building this junk yard over night Grease monkey maid 10/4 I need it if possible, I have a bbf429 numbers on rear of cam359356 can you tell me what cam I have. 330864: 1968 through 1991 oval port, open chamber, 2.06 in. with Jeff Smith: How to Decode a COMP Cams http://www.onallcylinders.com/Jeff Smith: First of all, the CC refers to COMP Cams. however, depending on how you want to look at it. Are you a newbie in dealing with cars and you seem not to know how useful a camshaft is and what is used for? * 54-55 all 6 cyl except PG, 58 D-D 2 nd design,59 series 3, 60-62 series 10-30,60-61 fleetmaster exc. How To Read Engine Block Numbers | Crate Engine Supplies side, aluminum1010617990350.LT5, ZR1, DOHC, 32-valve, drvs. Chevy Camshaft Identification - Club Hot Rod Forums I'll post up a pic as well. This card reveals the basic information you need to identify, properly install, and degree the camshaft in the engine. Hey. were used. Information is premium and can save you from errors and spending excessively. For as simple as this product appears, it is actually a very complicated piece of engineering if you study it closely. This an original 1966 283 camshaft casting number is 3732798, hydraulic lifters. Camshafts: GM Performance Motor On the home page, we looked for the Information tab and then clicked on Catalogs. motor could have casting number 10112391 or 10112391S that is the service replacement. A pushrod is a metal tube constructed to transfer the valve motion of a lifter riding on the camshaft directly to the value. Only show this user. journal.3.00" stroke3849847.283.forged..small journal.3.00" stroke3876764.283.forged or cast..sm. Roller: 202/206 .403"/.415" Can you tell me the specs on this cam from these numbers? View (5) $203.95 More Info. CAM 6930 1967 CAMSHAFT ID. $426.78. Small Block Factory Cams BBC Cylinder Head Casting Numbers RECTANGULAR PORT - Valve size 2.19 intake, 1.88 exhaust IP = Intake runner volume OVAL PORT - Valve size 2.06 intake, 1.72 exhaust BBC Camshaft Part Numbers Note 1: 80 deg overlap, 396 375hp L-78/L-89, 427 425/435hp L-71/L-72, 454 450hp LS-6, HP streetof engines we now know as Small Block Chevys. Do You Get a Ticket in the Mail for Passing a School Bus? This same pattern was followed throughout the 1997 production cycle. The 8th digit of the VIN. In 1971, it was the cam for the 307/200hp; 350/245hp, 270hp; and 400/255hp. The LS engine is designated 54 and this number is generally the first two numbers that define the actual cam part number. (Advanced five degrees; use spring P/N 3970627.) 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. Can omeone ID this GM cam? | The H.A.M.B. Can You Register a Car in a Different Name than on the Title? Privacy Policy. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. GEN III vs GEN IV. Do not enter the -2 on dual cams part numbers or the (I) that indicates intake or (E) for exhaust. LT1 casting numbers | LS1LT1 Forum This will help you get the full details directly from the manufacturing, which requires the model and other factors that need attention. All of these applications had the same specs as the initial 1967 application. I just rebuilt the carb as it was pretty dirty and leaked at the accel pump. 14088552 Leave a comment at the end of this post if you cannot find the information you want. For a better experience, please enable JavaScript in your browser before proceeding. This method requires you to do a few tasks like measuring some diameters and comparing them to the database. 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. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Remove the camshaft from the engine if necessary. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. exhaust valves. Deciphering The Differences In The Chevy 2.2L Engine A call to Comp at 1-800-999-0853 will probably give you some more details. To obtain specifications on a Crower cam please enter the part number (00242, 15210, etc) or custom work order number (E23456, A7890, etc) located on the end of the camshaft. COMP Cams 12-600-4 Thumpr Cam, Small Block Chevy, 2000-5800 RPM. The "2182" Casting number identifies this camshaft as GM part number 3972182. We continued down the list until we found the 3709 number, which because it is listed first on the camshaft, is the intake lobe. Using stamped numbers and. It is a mode of identification used by manufacturers. The GM tube has the ID number as 3863151 which correlates to a L79 Cam however the stamping at the end is 920883. PDF CAMSHAFT SPECIFICATIONS - Melling The first two numbers are the degrees of opening being 210 for the intake and 218 degrees for the exhaust given normally at .050 inch of lift. Specs @ 0.50 Cam Lift Opens Closes Duration SAE Specs@ (0.06/Rocker Arm Ratio) Cam Lift Opens Closes Duration Cam Lift Gross Valve Lift Center Line C/L Rocker Arm Ratio Valve Lash Clearance C-400-P INT. Hey Keith, we did some quick sleuthing and your cam MAY be for a BBC Marine (boat) motor application thats been discontinued. It means the valve is open at 255 degrees. 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.

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