A Guide To Mopar V8 Cylinder Head And Block Casting Numbers

This article will cover the majority of Dodge, Chrysler, and Plymouth V8 engines from 1958 through 1993. We have compiled a list of the casting numbers for both the cylinder heads and engine blocks, to be used as a reference when searching the junkyard. It will cover the following five engine families:

A-Series: The A-series engine was a small-block Mopar (SBM) engine produced from 1956 through 1967. The A-series cylinder heads featured polyspheric (not hemispheric as found in the FirePower engines) combustion chambers, which led to them being referred to as Poly engines. It came in 277 cubic-inch, 301 cubic-inch, 303 cubic-inch, 313 cubic-inch and 318 cubic-inch displacements, along with a Dodge-specific variant measuring 325 cubic inches, but called a 326.

LA-Series: The A-series’ successor, the LA-series engines are small-block Mopars which came on scene in 1964 and lasted until 1992. A modernized version of the LA-series, dubbed “Magnum” carried the design all the way into the new millennium, finally coming to an end in 2003. The LA engines featured a “wedge” style combustion chamber as opposed to the A-series’ polyspheric chambers. The V8 versions of the LA-series started off with a 273 cubic-inch variant, followed by 318 cubic-inch, 340 cubic-inch, and 360 cubic-inch variants.

B-Series: The B-series engine is Chrysler’s first official big-block engine. Released in 1958, they existed until 1978. Available in 350 cubic-inch and 361 cubic-inch variants at first, there were also 383 cubic-inch and 400 cubic-inch B-series engines. They shared most of their architecture with the RB-series, but with a shorter 3.375-inch stroke. Both the B and RB-series engines featured wedge-style combustion chambers.

RB-Series:  The RB-series engines came about a year after the B-series, and featured a longer 3.75-inch stroke for increased displacements of 383 cubic inches, 413 cubic inches, 426 cubic inches and 440 cubic inches. The 426 Wedge was Chrysler’s main performance engine until the 426 Hemi came on scene.

426 Hemi: The 426 Hemi was actually the second generation of hemispherical-headed engines, but were the first ones to actually be given the name of “Hemi.” It was released in 1964 and lasted until 1971. The iconic Mopar performance engine only existed in a 426 cubic-inch displacement in production vehicles, and is probably the rarest of any on this list.

CYLINDER HEADS

The casting numbers for small-block Mopar and big-block Mopar are a seven-digit number, which is raised, and usually found in one of two locations. The first would be on the top of the intake runner, under the valve cover. The second location is on the underside of the intake runner on the cylinder head.

The two locations in which you can find the casting numbers on Mopar cylinder heads.

LA Small-Block Mopar Cylinder Head Casting Numbers

2268341 – 1962-1967, 318 LA-series small-block, 1.84/1.56 valves

2465315 – 1964-1965, 273 LA-series small-block, 1.78/1.50 valves

2532080 – 1964-1965, 273 LA-series small-block, 1.78/1.50 valves

2536178 – 1966, 273 LA-series small-block,1.78/1.50 valves, early

2658234 – 1966, 273 LA-series small-block,1.78/1.50 valves, late

2658920 – 1967, 273 LA-series small-block, 1.88/1.50 valves

2658920 – 1967, 318 LA-series small-block, 1.78/1.50 valves

2658234 – 1967, 318 LA-series small-block, 1.78/1.50 valves

2843675 – 1967, 318 LA-series small-block, 1.78/1.50 valves

2843675 – 1968-1969, 273 LA-series small-block, 1.78/1.50 valves

2531894 – 1968-1970, 340 LA-series small-block, 2.02/1.60 valves

3418915 – 1970, 340 LA-series small-block, 2.02/1.60 valves, 63cc-73.5cc, T/A

3418915 – 1970-1972, 360 LA-series small-block, 1.88/1.60 valves, 65cc-73cc

3418915 – 1971-1972, 340 LA-series small-block, 1.88/1.60 valves

3462598 – 340 LA-series small-block, Trans-Am, 63cc-73.5cc

3671587 – 1973, 340 LA-series small-block, 1.88/1.60 valves, 65cc-73cc

3671587 – 1973-1974, 360 LA-series small-block, 1.88/1.60 valves, 65cc-73cc

3769950 – 1975-1978, 318 LA-series small-block, 1.78/1.50 valves, w/ air pump

3769974 – 1975-1976, 360 LA-series small-block, 1.88/1.60 valves

3769973 – 1975-1983, 318 LA-series small-block, 1.78/1.50 valves

4006335 – 1975-1978, 318 LA-series small-block, w/o air pump

4027591 – 1975-1978,  318 LA-series small-block, 1.78/1.50, w/ air pump

4006337 – 1976-1976, 360 LA-series small-block, 1.88/1.60 valves, 2bbl w/o air pump

3671587 – 1976, 360 LA-series small-block, 1.88/1.60 valves, 65cc-73cc

4027569 – 1977-1986, 360 LA-series small-block, 1.88/1.60 valves

4027163 – 1977-1986, 318 LA-series small-block, 1.78/1.50 valves

4027593 – 1977-1984, 318 LA-series small-block, 1.78/1.50 valves

4027594 – 1977-1978 360 LA-series small-block, 1.88/1.60 valves, 4bbl w/ air pump

4027163 – 1980, 318 LA-series small-block, 1.78/1.50 valves

4027596 – 360 LA-series small-block, 1.88/160 valves, 66cc-72.5cc

4027596 – 318 LA-series small-block, 1.88/160 valves, 66cc-72.5cc, High Performance

4041001 – 318 LA-series small-block, 1.78/1.50 valves, w/o air-pump

4041003 – 1976-1981, 360 LA-series small-block, 1.88/1.60 valves, 2bbl van and truck, w/o air pump

4071047 – 1977-1978, 360 LA-series small-block, 1.88/1.60 valves, 4bbl w/ air pump

4071051 – 1977-1980, 360 LA small-block, 1.88/1.60 valves

4071051 – 1981-1983, 318 LA-series small-block, High Performance

4100405 – 1979-1981, 318 LA-series small-block 1.78/1.50 valves, w/ air pump

4100408 – 1979-1980, 360 LA-series small-block 1.88/1.60 valves, 4bbl w/ air pump

4100409 – 1979 360, LA-series small-block 1.88/1.60 valves, 4bbl w/o air pump

4100409 – 1979-1980, 360 LA-series small-block 1.88/1.60 valves, 4bbl w/ air pump

4323302 – 1985-1986, 318 LA-series small-block, 1.78/1.50 valves, Fast Burn, 56cc -65cc

4323345 – 1983-1986, 318 LA-series small-block, 1.78/1.50 valves, Police, roller, 69cc – 77cc

4323475 – 1985-1987 318 LA-series small-block,  1.88/1.60 valves, 69cc -77cc, 4bbl

B/RB Big-Block Mopar Cylinder Head Casting Numbers

1406740 – 1958-1959, 361 B/RB-series big-block, 1.94/1.60 valves, HD, Truck

1737622 – 1958-1960, 350/361/383 B/RB-series big-block, 1.94/1.60 valves, 73.5cc

1737635 – 1958, 350/36, B/RB-series big-block, 1.94/1.60 valves, 73.5cc

1737637 – 1958-1959, 361 B/RB-series big-block, 1.94/1.60 valves

1844705 – 1958-1959, 350/361/383, B/RB-series big-block, 1.94/1.60 valves, 73.5cc

1851524 – 1958-1971, 350-413 B/RB-series big-block, Truck

2202594 – 1958-1971, 350-413 B/RB-series big-block, Truck

1944705 – 1958-1959, 361 B/RB-series big-block, 1.94/1.60 valves

1851509 – 1959, 361/383/413 B/RB-series big-block, 2.08/1.60 valves, HP

1737637 – 1960, 383 B/RB-series big-block, 1.94/1.60 valves

2264547 – 1960-1971, 361/413 B/RB-series big-block, Truck

2128521 – 1960-1961, 361/383/413 B/RB-series big-block, 2.08/1.60 valves, 73.5cc, 300F

2128522 – 1960-1961, 361/383, B/RB-series big-block, 1.94/1.60 valves, 73.5cc

2899913 – 1960-1971, 413 B/RB-series big-block, Truck

2206324 – 1961-1962, 361/383/413 B/RB-series big-block, 2.08/1.60 valves

2206924 – 1961-1962, 361/383/413 B/RB-series big-block, 2.08/1.60 valves, 73.5cc, 300H

2402286 – 1962, 413 B/RB-series big-block, 2.08/1.88 valves, Max Wedge, 81cc

2402557 – 1963, 413 B/RB-series big-block, 2.08/1.74 valves, 73.5cc, 300J/early K

2406209 – 1963, 413 B/RB-series big-block, 2.08/1.88 valves, Max Wedge, 81cc

2406740 – 1963-1968, 361, 413 B/RB-series big-block, Truck and  Marine

2463209 – 1963, 426 B/RB-series big-block, 2.08/1.88 valves, Max Wedge

2463200 – 1963, 361/383/413 B/RB-series big-block, 2.08/1.60 valves, 73.5cc

2406516 – 1964-1967, 361/383 B/RB-series big-block, 2.08/1.60 valves, 73.5cc, 300L

2406518 – 1964, 426 B/RB-series big-block, 2.08/1.88 valves, Max Wedge, 86cc

2408520 – 1964, 413 B/RB-series big-block, 2.08/1.60 valves, 73.5cc, 300K w/ Ram intake

2268341 – 1965, 426 B/RB-series big-block

2406780 – 1965-67 383 B/RB-series big-block, Truck

2406158 – 1967, 440 B/RB-series big-block, 2.08/1.60 valves, 73.5cc

2708915 –  1967 440 B/RB-series big-block, 2.08/1.74 valves, 73.5cc, HP

2780915 – 1967, 440 B/RB-series big-block, 2.08/1.74 valves, HP

2843906 – 1968-1970, 383/440 B/RB-series big-block, 2.08/1.74 valves

2951250 – 1968, 440 B/RB-series big-block, 2.08/1.74 valves, 79.5cc

3462346 – 1971-1972, 383/400/440 B/RB-series big-block, 2.08/1.74 valves, 79.5cc

2466676 – 1971-1977, 361/413 B/RB-series big-block, Truck and Marine

2899943 – 1971-1977, 361/413 B/RB-series big-block, Truck

3462345 – 1972-1973, 400/440, B/RB-series big-block, 2.08/1.74 valves, Emissions

3462346 – 1973, 400/440 B/RB-series big-block, 2.08/1.74 valves. 81.5cc

3751213 – 1973, 400/440 B/RB-series big-block, 2.08/1.74 valves, Motor Home

3769902 – 1974, 400/440 B/RB-series big-block, 2.08/1.74 valves

3769975 – 1975, 400/440 B/RB-series big-block, 2.08/1.74 valves, 83.1cc

4006452 – 1976-1978, 400/440 B/RB-series big-block, 2.08/1.74 valves, 81.5cc

4021051 – 1977-1986, 360 B/RB-series big-block, 1.88/1.60 valves

2806887 – 426 B/RB-series big-block, Marine and Industrial

3614476 – MOPAR Stage IV, B/RB-series big-block, 2.08/1.74 valves

4286526 – MOPAR Stage V, B/RB-series big-block, 2.08/1.74 valves

 

426 Hemi Cylinder Head Casting Numbers

2468016 – 1964 426 Hemi, 2.25/1.94 valves

2488596 – 1964 426 Hemi, early production/prototype race head

2531110 – 1965 426 Hemi, 2.25/1.94 valves, (SS) – Aluminum (Alcoa)

2531695 – 1965 426 Hemi, 2.25/1.94 valves, (SS) – Aluminum (Alcoa) Rev B

2531718 – 426 Hemi, A-148

2780559 – 1966-1971, 426 Hemi, 2.25/1.94 valves

2945270 – 426 Hemi, Cast Iron, D3

3512015X – 426 Hemi, D4

3614433 – 426 Hemi, Aluminum

ENGINE BLOCKS

Casting numbers for the small-block Mopar and big-block Mopar engine blocks can be found on the left (driver’s) side of the block, and will consist of seven numerals. These numbers are different than the stamped eight-digit number found on the right side of the engine. That number is the last eight digits of the Vehicle Identification Number. When identifying the block, you want the raised seven-digit number, not the stamped eight-digit number.

An example of an engine block casting number. In this case, 3698330 – an RB-series 440 cubic-inch block, cast June 28, 1973.

Small-Block Mopar Engine Block Casting Numbers

2264230 – 1960-1967, 318 A-series small-block

2463252 – 273 LA-series small-block

2465330 – 1964-1966, 273 LA-series small-block

2466090 – 318 LA-series small-block

2468230 – 318 A-series small-block

2532630 – 318 A-series small-block

2536030 – 1967-75, 318 LA-series small-block

2536130 – 1965, 273 LA-series small-block

2566080 – 318 LA-series small-block

2780930 – 1968-1973, 340 LA-series small-block, Not T/A or AAR

2806030 – 1966-1969, 273 LA-series small-block

2806030 – 1961-1974, 318 LA-series small-block

2806130 – 1965-1969, 273 LA-series small-block

3418496 – 1971-1974, 360 LA-series small-block

3577130TA – 1970-1971, 340 LA-series small-block, T/A and AAR

3810230 – 1975-1978, 360 LA-series small-block

4104230 – 318 LA -series small-block,  Race Engine

4179930 – 1975 – 1993, 360 LA-series small-block

 

Big-Block Mopar Engine Block Casting Numbers

1944929 – 1958, 350 B-series big-block

1737629 – 1961-1964, 361 B-series big-block

1851629 – 1961, 413 RB-series big-block

1851729 – 1959-1964, 383 B-series big-block

1852029 – 1962, 413 RB-series big-block

1852029 – 1962-1963, 413 RB-series big-block

1852029 – 1962-1965, 426 RB-series big-block

1945429 – 1965, 361 B-series big-block

2120229 – 361 B-series big-block

2120329 – 1959-1960, 383, RB-series big-block

2120429 – 361, B-series big-block

2120529 – 1959-1965, 413, RB-series big-block

2128854 – 1964, 361/383, B-series big-block

2205697 – 1959-1965, 413/426 RB-series big-block

2205712 – 1958-1966, 361B-series big-block

2406730 – 1963-1965, 426 RB-series big-block , Wedge/Max Performance Wedge

2432230 – 1964-1966, 426 RB-series big-block, Wedge/Max Performance Wedge

2440873 – 426 RB-series big-block

2468030 – 413/426 RB-series big-block

2468130 – 1959-1971, 383 B-series big-block

2468330 – 1964-1965, 426 RB-series big-block

2468330 – 1966-1971, 426 RB-series big-block, HEMI

2532130 – 1965, 383 B-series big-block

2532230 – 1964-1966, 426 RB-series big-block, Wedge

2536430 – 1966-1972, 440 RB-series big-block

2568130 – 1959-1971, 383 B-series big-block

2658836 – 426,  RB-series big-block, Commercial

2658930 – 1965, 361 B-series big-block

2899830 – 1970, 383 B-series big-block

3614230 – 1971-1972, 400 B-series big-block

3698330 – 1973-1978, 440 RB-series big-block

3698630 – 1973-1978, 400 B-series big-block

3698830 – 1972-1978, 440 RB-series big-block

4006530 – 1976-1978, 400 B-series big-block

4006630 – 1975-1978, 440 RB-series big-block

 

426 Hemi Engine Block Casting Numbers

2468330 – 1964-1971, 426 Hemi

About the author

Greg Acosta

Greg has spent over a decade in automotive publishing as Senior Editor of Race Pages magazine. In his free time, he is a firearms instructor and volunteer in the police armory.
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