1. Sep 14, 2012  Chevy Small Block - Engine Block Casting Numbers Notes (for below): 'High Power' is the maximum rate HP this block was used for, 'Low Power' is the lowest rated horsepower RPO engine the block was used in. 'Main Caps' is the number of bolts holding the cap. A 'two-bolt' main, or a four-bolt main. Four bolt main blocks are desirable in high performance applications because the extra strength.
  2. Dec 11, 2007  Engine Stamping Engine stampings evolved in the early years of the Chevrolet V8 engine. In 1955-56, it was simply a continuous serial number, but one that didn’t match the serial number of the Corvette. It was then followed with F for Flint, where the Corvette engine was manufactured and then the year (F55 or F56).

In 68-69 model cars, the serial (VIN) number of the car the engine was installed in is stamped next to, or under the engine code ID. Starting in 1970, the serial number is stamped either above the oil filter, somewhere on the block pad (in front of the cylinder head), or on the transmission flange somewhere. Open the hood. Locate the engine code stamped into the engine block. For 6-cylinder engines, check behind the distributor on the right hand, or passenger, side of the block. For 8-cylinders, check behind the water pump on the front of the block. Finding the block numbers on my old chevy v8 first gen.

Serial
#Engine CodeYearsCidApplicationEngine VinHpBblGm Body Comments
1C1957265MT 3 SPDcars/Vette/Omega
2C*1958283MT 3 SPD1852cars
3C**1960283MT1702cars/Omega
4C2K1977305LG3U1452FX
5C2L1977305LG3U1452F X/Omega
6C2M1977305LG3U1452FX
7C2R1982305Roch E4ME carbH LG41554B F G/Monte
8C2S1982305Roch E4ME carbH LG41554B F G
9C2T1982305Roch E4ME carbH LG41554B F G
10C2U1982305Roch E4ME carbH LG41554B F G/impala
11C2W1982305Roch E4ME carbH LG41554B F G/Monte
12C2X1982305Roch E4ME carbH LG41554B F G/Omega
13C3N1978305LG3U1452Camaro/Monte
14C3P1978305LG3U1452G/Omega
15C3T1978350LCamaro
16C4A1984305Roch E4ME carbH LG41504B F G/Impala
17C4B1984305Roch E4ME carbH LG41504B F G
18C4C1984305Roch E4ME carbH LG41504B F G/Omega
19C4D1984305Roch E4ME carbH LG41504B F G/Omega
20C4N1982267Roch E2ME carbJ L392A B/Monte
21C4P1985305Roch E4ME carbH LG41504B F/Monte
22C4R1982267Roch E2ME carbJ L392B G
23C4R*1985305Roch E4ME carbH LG41504B
24C4S1982267Roch E2ME carbJ L392B
25C4T1982267Roch E2ME carbJ L392B G/Omega
26C4U1982267Roch E2ME carbJ L392B G
27C4W1982267Roch E2ME carbJ L392B G/Impala
28C4W*1984305Roch E4ME carbH LG41504F B/Omega
29C5A1982350LM1L4police/Impala
30C5B1982350LM1L4police
31C5P1985350Tuned port inj6Parisien/Monte
32C7A1985305Roch E4ME carbH LG41504B F G/Omega
33C7B1985305Roch E4ME carbH LG41504B F G
34C7D1986305Roch E4ME carbH LG41504F
35C7H1986305Roch E4ME carbH LG41504F
36C7L1987305Roch E4ME carbH LG41504F/police/taxi/Monte
37C7M1987305Roch E4ME carbH LG41504F/Kingswd
38C8B1979305LG3G1302F X/Impala
39C8C1979350LM1L4F/Monte
40C8X1980267Roch E2ME carbJ L392F/Monte
41CAR1972350Turbo 350, Calif emis1652A B
42CAR*1985305Roch E4ME carbH LG41504F/Monte
43CAT1972400t/h trans, CalifLF62B
44CAZ1972307Powerglide NB21302A F X/Monte
45CB1958283MT1852truck/1271/Monte
46CB*1963283m/t, police, h/pcars/Monte/impala
47CBG1971350Powerglidefull size/Impala
48CCA1971307MT2002A F X
49CCC1971307Powerglide2002A F X/Monte
50CD1957265m/t, 0. D.2car/truck

  • 1
Small Block Chevy Engine Block Identification

General Small block Info Small Block Casting Numbers Block Casting Date Engine Code Stamping Casting Clock Code
VIN Code Format Camaro Specific Engine Codes Small Block Suffix Codes
283 Chevy Engine Serial Number Location

General Decoding Information
This topic can be somewhat confusing, especially with the amount of information available and the interpretation of it. The primary pieces of information you'll decode are the Engine Code and Partial VIN. You can decode the casting number. And you can check dates. The engine code and partial vin # will accurately nail down whatever the thing is rather quickly, and the other information will fall into line with that.

To QUICKLY IDENTIFY A CHEVY ENGINE CLICK HERE - for decoding engine codes.

This page has basic information on it, but it's a portion of the Small Block Chevy numbers information. The Engine Code page is where this topic is further detailed.

283 Chevy Engine Serial Number Location 2001 Honda Foreman Rubicon

'Numbers Matching'
This is my opinion, and the generally accepted norm:
When people say 'It's numbers matching' - what they mean is the engine (or other component, i.e the transmission) can be MATCHED to the vehicle it was originally used in. This match is done via the PARTIAL VIN stamp on the component. The partial VIN will match the vehicles VIN. If it does - it's 'numbers matching', otherwise - it's not. done. end of story.
Some folks use these terms loosely, or will say 'numbers correct' or something to that effect. But numbers correct is not numbers matching. Again, it either matches or it doesn't. If it doesn't match - is it correct?
Numbers matching is important when you're trying to decode a Z28 or Super Sport where the VIN won't identify the vehicle as such. You need to decode the engine and see if it matches the vehicle, and if the code signifies Z28 or SS equipment.
Lastly, in extreme cases, you'll want to verify the numbers stamped onto the component were the ones stamped into it originally and aren't restamped.
The point of this article is to help you figure out how to decode stuff.

Engine Code Stamping Numbers
All engines are stamped with an engine ID code, consisting of assembly plant code, production date and suffix code. M audio omni studio. V8 codes are stamped on a pad just forward of the right side (passenger) cylinder head. 6 cylinder engines are stamped on the passenger side of the block behind the distributor.
Click here for Chevy Engine Code Listings

The engine date must precede the car build date, otherwise something is amiss. Some engine machining operations (decking) will obliterate the engine ID.

Engine ID Code Example: V0101CLJ - (V = Plant, 01 = Month, 01 = Day, CLJ = Engine Suffix Code)
Another example: T0830CTY - (T = Tonawanda, 08 = August, 30 = 30th day, CTY = 1970 396 Camaro, 375 hp, 11.0:1, TH400)

CodeEngine PlantCodeEngine Plant
FFlint (Motor)SSaginaw Service
HHydramaticTTonawanda
KSt. Catherines, OntarioVFlint (Engine)
(McKinnon Industries Canada)
MGM of Mexico

VIN Code Format
The vin code format is stamped onto most engines. The format consists of divisional identification number, model year, assembly plant designation and vehicle serial or sequence number.
In 68-69 model cars, the serial (VIN) number of the car the engine was installed in is stamped next to, or under the engine code ID.
Starting in 1970, the serial number is stamped either above the oil filter, somewhere on the block pad (in front of the cylinder head), or on the transmission flange somewhere. Chevrolet issued technical service bulletins to indicate which engines were to recieve a vin stamp, so who knows what could have happend (or not happened).

VIN code format Example: 13N100001
(1 = Chevrolet, 3 = 1973, N = Norwood, 100001 = Production sequence of vehicle VIN)

For a list of assembly plants, click here.

Casting Clock
On some Saginaw blocks, intakes and exhausts a 'clock' was cast into the block. The clock is a circle of 10 dots, one dot for each hour of a shift (usually 10 hour shifts). An arrow points to the beginning of the shift an another dot outside the circle indicates what time of day the cast part was made. Anyways, that's what that circle thing is (if you happen to see it on something). Casting Date
Small block casting date is located on driver side rear of block on flange forward of bellhousing. Big block on the right side of engine above the oil pan rails.

Casting Date Example: E038 - (E = Month, 03 = Day, 8 = Last digit of model year (1978)).

Month: A = Jan, B = Feb, C = Mar, D = Apr, E = May, F = Jun, G = July, H = Aug, I = Sep, J = Oct, K = Nov, L = Dec

General Engine Block Specifications
While 6 different bore size blocks have been produced, the small block engine can be classified into 3 bore sizes and 3 main bearing sizes. 283 blocks (3.875' bore, 2.3' main), 302/327/350 blocks (4' bore, 2.3' or 2.45' mains), and 400 blocks (4.126', 2.65' mains). In 1968 the main bearing saddles were increased in size from 2.3' to 2.45'.
CIDYearBoreMain Cap
26219753.6712 bolt ONLY
2671979 - 813.5002 bolt ONLY
3051976 - 963.7362 bolt ONLY
3071968 - 733.8752 bolt ONLY
3271968-694.001 (2.3' main)2 bolt
3501968-884.001 (2.3' main)2 bolt
26519944.001 (2.45' main)2 bolt
3021968-694.001 (2.45' main)4 bolt
3501968-964.001 (2.45' main)4 bolt
4001970-724.126 (2.65' main)4 bolt
4001973-804.126 (2.65' main)2 bolt

Notes: 2 bolt ONLY means just that,. otherwise 2 or 4 bolt can mean either design..

Chevy Small Block - Engine Block Casting Numbers

283 Chevy Engine Serial Number Location Lookup

Notes (for below): 'High Power' is the maximum rate HP this block was used for, 'Low Power' is the lowest rated horsepower RPO engine the block was used in. 'Main Caps' is the number of bolts holding the cap. A 'two-bolt' main, or a four-bolt main. Four bolt main blocks are desirable in high performance applications because the extra strength of the additional bolts keeps the bottom end rigid and less prone to failure. However, a properly prepared 2 bolt main engine will work just fine (often times you'll lose a rod bolt before you break a crank because it's 'only' a 2 bolt main).
Years Casting CIDLow PowerHigh Power Main CapsComments

1980-85 140029 350 - - 2 car
1973-803308174001501802car, truck
19753559092621101102car, truck
1976-85 355909 305 -- 2 A
1975 360851 262 - - 2 Monza
1976-79 361979 305 -- 2 car, truck
1978-86 366245 350 -- - car
1982-86 366286 350 -- 4 Chevrolet, siamese
1982 366299 350 -- 4 Chevrolet, aluminium
1956-67 383810 283 -- 2 -
1967-68 389257 302 -- 2 Z-28
1968-73 391436 307 -- 2 -
1965-67 393288 283 -- 2 car, truck
1976-79 460776 305 -- 2 car, truck
1976-79 460777 305 -- 2 car
1978-79 460778 305 -- 2 car, truck
1979-82 471511 267 -- 2 car, truck
1976-85 581671 305 -- 2 A
1985-94 1489363 350 -- 2 -
1979-82 2135412 267 -- 2 -
1979-82 2404929 267 -- 2
1973-76 3030817 400 -- 2 car, truck
1958-61 3556519 283 -- 2 car, truck
1955 3703524 265 195 _ 2 car, no filter
1955-56 3720991 265 195 225 2 car, truck
1957 3731548 283 220 283 2 -
1956-67 3736935 283 -- 2 -
1957-59 3737739 283 220 290 2 car, truck
1958-62 3756519 283170 315 2 car, truck
1956-67 3756935 283 - - 2 -
1962-6537828703272503752car, truck
1956-67 3789187 283 - - 2 -
1962-67 3789817 327 210275 2 car, truck
1961-6237899352831703152Late 61 car & vette
1962-673790721283 1702202Chevy II
1964-6737913623272503002Replaced 3790721
1958-6337942262831701952Car & truck
1968-69 3794460 327 250 250 2 truck
1968-69 3814660 327 - - 2 F A
1968-69 3814660 302 - - 4 Camaro, Z-28
19633830944327-3002-
1956-67 3832338 283 - - 2 -
1964-6638348102831952202Car, truck & marine
1962-6338348122831701952car & truck
1958-62 3837739 283 - - 2 -
1964-6838498522831952202car & truck
1956-67 3849859 283 - - 2 -
1956-67 3849935 283 - - 2 -
1964-67 3858174 327 - - 2 car, truck
1968-76 3855961 350 - - 2 car
1964-6738581743272753502Full, A & Y
1964-6738581803272503002-
1962-67 3858190 327 - - 2 -
1965-6738621942831952202Chevy II
1962-66 3864812 283 230 - 2 car, truck
1964-673868657327 300 - 2
1962-673876132327 - - 2
19633889935283 - - 2 truck
196738926573022902902Z-28, small journal
196738926573272103502car & truck
196738926573502952952Camaro
1968-693892659327 210 - 2
196738969442831951952replaced by 307 in 68
196738969482831951952identical to 3834810
196739033523272103502cars only
1969-803911460350 - - 2A
1968-733914635307 - - 2car
196839146363072002002car & truck
1968-693914638327 - - 2
1968-733914653307 - - 2A
196839146603272103002cars
196839146783022902902/4Camaro, Z-28
196839146783272103502car & truck
196839146783502952952Camaro/ChevyII
1965-673932288283 -- 2A
1956-673932338283 -- 2
1974-753932368350 -- 2
1969-733932371307 -- 2 car,truck
1969-733932373307 -- 2 car,truck
196939323863022902904Camaro Z28
196939323863272102102Camaro
196939323863503003504
196939323883022902904Z28
196939323883503003004cars
1968-693933100327 - - 2
1968-693933180327 - - 2
19683941174307 - - 2truck
1956-673949852283- -2
1970-8039515094001502652/4car,truck
1970-7339515114002552654B & G body
1962-673953512327--2
1968-693955618327--4 A,F,Vette
196939566183022902904Z28
196939566183272352352fullsize
196939566183502503502/4cars
196939566323072002002car & truck
1969-763958618350--2 A
1962-633959512327250-2
1956-673959532283--2
19683970010327--2 A
1969-7939700103501853702 or 4car, truck, Vette
1970-7339700143502003002/4LA built Camaro
1969-7339700203071152002car,truck
1969-7239700243071302002A,F,X
1968-766259425350 ---car,truck
1980-8414010201305--2car,truck
1980-8414010202305--2car,truck
1980-8414010203305--2car, truck
1980-8214010205267--2-
1980-8514010207350--4truck
1980-8514010209350--4truck
1978-8614010231305--2 -
1979-8214010280267--2 car
198214011064 350-- 4 Chevrolet, high tin
1979-8214016375 267-- 2 -
1979-8214016376 267-- 2 car
1978-8514016379 350-- - car, truck
1980-8414016381 305-- 2 car, truck
1978-8814016383 305-- 2 -
1979-8214040205 267-- 2 -
1978-8614049047 305-- 2
1986-9414079287 350-- -
198714088526 350-- 2 Camaro
1986-9414088548 350-- - -
1986-9214088551 305-- 2 -
1988-9414093627 305-- 2 -
1986-9414093638 350-- -
1988-9414094766 305-- 2
1986-9414101148 350-- -
1987-8814102058 305-- 2
1969-8514316379 350--2

Camaro Engine Code Stamping Numbers
Dropbox contains Camaro engine suffix codes for year selected.


283 Chevy Engine Serial Number Location Number

Last updated: 9/14/2012
Author: MadMike Maciolek


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