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Early Hemi Serial Numbers


The tables below detail the starting engine serial numbers used on the 1950s Mopar Hemi engines (often referred to as the "old style" hemi). These are easily differentiated from the new (426) Hemi motors in that the old motors had the distributors located to the rear of the carburetor, similar to the old small blocks.

The information presented below is probably not to be considered 100% complete, but it may help in identifying that mystery motor in grandpa's garage! For more technical information on the old-style hemis, click here.

Webmaster's note. See A-engines, Sonoramic, Polyspherical engines; 392 C300 engine; the origins of the Hemi

also see a full article on the original Hemi - its development and applications.

And be sure to read the corrections below the table.

Serial Number Year CID Horsepower Rating

Chrysler

C51-8-1001 1951 331 180 hp
C52-8-1001 1952 331 180 hp
C53-8-1001 1953 331 180 hp
C541-8-1001 1954 331 235 hp
C542-8-1001 1954 331 235 hp
NE55-1001 1955 331 250 hp
CE55-1001 1955 331 250 hp*
3NE56-1001 1956 331 300 hp (300 Letter Car)
WE56-1001 1956 331 250 hp
NE56-001 1956 354 280 hp
3NE56-1001 1956 354 340 hp (300 Letter Car)
WE57-1001 1957 354 280 hp
LE57-1001 1957 354 295 hp
NE57-1001 1957 392 325 hp
NE57-1001 1957 392 375 hp (300 Letter Car)
58W-1001 1958 392 290 hp
58S-1001 1958 392 310 hp
58-1001 1958 392 345 hp
58C-1001 1958 392 345hp
58N3-1001 1958 392 380 hp (w/2-4 bbl)
58N3-1001 1958 392 390 hp (w/Fuel Injection)

Dodge

D44-1001 1953 241 140 hp (Red Ram)
D50A-1001 1954 241 140 hp (Red Ram)
D553-1001 1955 270 183 hp
D553-1001 1955 270 193 hp (w/Power Pak)
D500-1001 1956 315 260 hp (D500)
KD500-1001 1957 325 285 hp
KD500-1001 1957 325 310 hp (w/Power Pak)

DeSoto

S17-1001 1952 276 160 hp FireDome
S16-1001 1953 276 160 hp FireDome
S19-1001 1954 276 170 hp FireDome
S21-1001 1955 291 185 hp FireDome
S22-1001 1955 291 200 hp FireFlite w/4b
S23-1001 1956 330 230 hp FireDome
S24-1001 1956 330 255 hp FireFlite w/4bbl
S24A-1001 1956 341 320 hp Adventurer
S25-100 1957 341 270 hp FireDome
S26- 1001 1957 341 292 hp FireFlite w/4bbl
S26A-1001 1957 345 345 hp Adventurer

* Robert Hovland wrote: “There was a 300 HP 331 engine built for the 1955 Chrysler C300, the first model year for the 300. In addition, two different displacement engines are listed for 300s for 1956 and 1957. To the best of my knowledge, there was only one displacement hemi engine for each model year of Chrysler passenger gars for each and every year from 1051 through 1958.

1951 Hemi Firepower

The polysphere engine which came out as a 301 cubic inch engine in the 1955 Windsor was used in the non-hemi Chryslers in the 1955-1958 model years. This Polysphere engine, called the Spitfire, became a 331 in the 1956 Windsor(225 HP in the Windsor, 2 barrel carb, 250 HP optional and with a WCFB four barrel carb), and became a 354 in the 1957 and 1958 Windsor and Saratoga models (285 HP in the 57 Windsor with a 2 barrel carb, 295 HP in the 57 Saratoga with an AFB four barrel, 290HP in the 58 Windsor with a 2 barrel carb, 310 HP in the 58 Saratoga with an AFB four barrel. So, you better look at your data once more; you should find that the Hemi for US Chrysler passenger cars was 331 from 1951-55, only 354 in 1956, and only 392 in 1957 and 1958.

The 1956 300 had an optional engine rated at 355 HP and it was not recommended for normal street driving. There may have also been an optional engine (different cam) for the 57 300--I'm not sure. On the 58 300s there was also a very limited production option of Bendix fuel injection available on the 300D engine; I'm not sure what the horsepower rating was on this engine.


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