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Small Block Chevy V-8 Casting Numbers Information Blocks

Hopefully the Information here will help you Engine builders.  You can Find Spec's on Blocks, Torque.

Warning:  This Information is Posted as 
                 a Guide Only.
                  Be Sure to Check with Cheverolet Engine
                  Manuals to be sure about your engine
                  spec's.
                  The J.S.B.R.C. is not responsible 
                  for your engine building mistakes...

                  Small Block Chevy Engine Block Identification


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".

CID   Year   Bore   Main Cap
262   1975           3.671   2 bolt ONLY
267   1979 - 81   3.500   2 bolt ONLY
305   1976 - 96   3.736   2 bolt ONLY
307   1968 - 73   3.875   2 bolt ONLY 
327   1968-69     4.001  (2.3" main)   2 bolt
350   1968-88     4.001  (2.3" main)   2 bolt
265   1994          4.001  (2.45" main)   2 bolt
302   1968-69    4.001  (2.45" main)   4 bolt
350   1968-96    4.001  (2.45" main)   4 bolt
400   1970-72    4.126  (2.65" main)   4 bolt
400   1973-80    4.126  (2.65" main)   2 bolt

Notes: 2 bolt ONLY means what it says. You will NOT find a 4 bolt 305 block (made by the factory). Period. Otherwise 2 or 4 bolt can mean either design...

Engine Code Stamping Numbers
All engines are stamped with an engine ID code, consisting of assembly plant code, production date and suffix code. 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.
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)

Engine Plant Code
Flint (Motor/6-cyl)  F
Hydramatic  H
St. Catherines, Ontario K
(McKinnon Industries Canada)
GM of Mexico  M
Saginaw Service S
Tonawanda  T
Flint (Engine/V8) V


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

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)

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 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  CID   Main Caps   Comments
1980-85      140029  350 - - 2 car
1973-80       330817  400 - - 2 car, truck
1975            355909  262 - -  2 car, 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  283 230  315  2 car, truck
1956-67      3756935  283  -  -  2 -
1962-65      3782870  327 250  375  2 car, truck
1956-67      3789187  283  -  -  2 -
1962-67      3789817  327  210 275  2 car, truck
1961-64      3789935  283 230  315  2 car, truck, Vette
1966-67      3790721  283  -  -  2 Chevy II
1964-67      3791362  327  300  300 2 Chevy II
1958-62      3794226  283 220  220 2 truck
1968-69      3794460  327  250  250 2 truck
1968-69     3814660  327 -  -  2 F A
1968-69      3814660  302  -  -  4 Camaro, Z-28, Vette
1956-67      3832338  283  -  -  2 -
1956-67     3834812  283 -  -  2 -
1958-62     3837739  283 -  -  2 -
1957-66      3849852  283 220  -  2 car, truck
1956-67      3849859  283  -  -  2 -
1956-67      3849935  283 -  -  2 -
1964-67      3852174  327  -  -  2 car, truck
1968-76       3855961  350  -  -  2 car
1964-67      3858174  327 300  -  2 A
1964-67      3858180  327 250  -  2 -
1962-67     3858190  327 -  -  2 -
1966-67      3862194  283 -  -  2 Chevy II
1962-66      3864812  283 230  -  2 car, truck
1964-67       3868657 327  300  -  2 
1962-67       3876132 327  -  -  2 
1963             3889935 283  -  -  2  truck
1962-67       3892657 327  -  -  2 car, truck
1967             3892657 302  290  -   Z-28, small journal
1968-69       3892659 327  210  -  2
1962-66       3896944 283  230  -  2
1965-67      3896948 283  -  -  2
1964-67      3903352 327  250  -  2
1969-80      3911460 350  -  -  2 A
1968-73     3914635 307  -  -  2 car
1968-73      3914636 307  -  -  2 car, truck
1968-69      3914638 327  -  -  2
1968-73      3914653 307  -  -  2 A
1968-69      3914660 327  250  -  2 truck
1968-69      3914678 302  290  -  2/4 Camaro, Z-28
1968-69       3914678 327  210  295 4 car, truck
1968            3914678 350  210  295 4 cars
1965-67      3932288 283  - -  2 A
1956-67      3932338 283  - -  2
1974-75      3932368 350  - -  2
1969-73      3932371 307  - -  2  car,truck
1969-73      3932373 307  - -  2  car,truck
1968-69       3932386 350  300 350  4 LT1,4
1968            3932386 327  - -  2 A
1969            3932386 302  290  -  4 Camaro,Z28
1969-76     3932388 350  165 300  2 car,truck 
1968-69     3933100 327  -  -  2
1968-69       3933180 327  -  -  2
1968             3941174 307  -  -  2 truck
1956-67       3949852 283  -  - 2
1973-80       3951509 400 -  - 2 car,truck
1970-73      3951511 400 -  - 4 truck
1962-67       3953512 327 -  - 2 
1968-69       3955618 327 -  - 4 A,F,Vette
1969            3956618 302 290  - 4 Z28
1969-79       3956618 350 165 350 4 car, truck, vette
1969-76       3958618 350 - - 2  A
1962-63      3959512 327 250 - 2
1956-67      3959532 283 - - 2 
1968            3970010 327 - - 2  A
1969-79      3970010 350 185 370 2 or 4 car, truck, Vette
1968-76      3970014 350 - - 2 car,truck
1969-73      3970020 307 - - 2 car,truck
1968-76       6259425 350  - - - car,truck
1980-84    14010201 305 - - 2 car,truck
1980-84    14010202 305 - - 2 car,truck
1980-84    14010203 305 - - 2 car, truck
1980-82    14010205 267 - - 2 -
1980-85    14010207 350 - - 4 truck
1980-85    14010209 350 - - 4 truck
1978-86    14010231 305 - - 2 -
1979-82    14010280 267 - - 2 car
1982          14011064 350 - - 4 Chevrolet, high tin
1979-82    14016375 267 - - 2 -
1979-82    14016376 267 - - 2 car
1978-85    14016379 350 - - - car, truck
1980-84    14016381 305 - - 2 car, truck
1978-88    14016383 305 - - 2 -
1979-82    14040205 267 - - 2 -
1978-86    14049047 305 - - 2
1986-94    14079287 350 - - -
1987         14088526 350 - - 2 Camaro
1986-94   14088548 350 - - - -
1986-92   14088551 305 - - 2 -
1988-94   14093627 305 - - 2 -
1986-94   14093638 350 - - -
1988-94   14094766 305 - - 2
1986-94   14101148 350 - - -
1987-88   14102058 305 - - 2
1969-85   14316379 350 - - 2

Small Chevy Bolt Torque Information
7/16 in. outer main cap bolt  65 ft.-lbs.
7/16 in. inner main cap bolt  70 ft.-lbs.
3/8 in. outer main cap bolt  40 ft.-lbs.
11/32 in. connecting rod bolt  38-44 ft.-lbs.
3/8 in. connecting rod bolt  40-45 ft.-lbs.
Cylinder head bolts  65 ft.-lbs.
Screw-in rocker arm studs  50 ft.-lbs.
Intake manifold bolts (cast iron heads)  30 ft.-lbs.
Oil pump bolt  60-70 ft.-lbs.
Cam sprocket bolts  18-20 ft.-lbs.
Harmonic damper bolt  60 ft.-lbs.
Flywheel/flexplate bolts  65 ft.-lbs.
Pressure plate bolts  35 ft.-lbs.
Bellhousing bolts  25 ft.-lbs.
Exhaust manifold bolts  25 ft.-lbs.