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Hemi Engine

Presented here is a chart for all of the Early Hemi engines produced by the Chrysler Corporation. Intermixed with the Hemi head engines is details of the Poly head engines.

What in the world is a Poly head?

The Graphics are of a Chrysler 331 cubic inch Model.

  • Click on the images for a larger picture.

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    Image of left side of a early Chrysler Hemi engine Left sideImage of right side a early Chrysler Hemi engine Right Side

    Image of front cross section of a early Chrysler Hemi engine Front Cross section.Image of right side cross section of a early Chrysler Hemi engine Right Side Cross section.

    Image of top open block of a early Chrysler Hemi engine Top Open Block.Image of bottom open block of a early Chrysler Hemi engine Bottom Open Block.

    Image of bottom side a early Chrysler Hemi engine head.Cylinder Head - Bottom Image of top side a early Chrysler Hemi engine head.Cylinder Head - Top

    Image of bottom side a early Chrysler Hemi engine head.Rockers Image of top side a early Chrysler Hemi engine head.Cylinder Head - Installation
     

    A note about Early and Late Block castings.

    In the following graphic there are two styles of castings. It is believed that the early casting was changed to the late casting style for the model year of 1954.

    The service manual for 1953 shows only the Early casting. The preliminary service manual for 1954 shows both castings.

    In the graphic the castings are depicted from the distributor C/L rearward.
    The Later Casting is the preferable one because of lack of the extended bell housing. The Later casting is more easily converted to other transmissions.
    Block casting sectionsCastings-Click on the image for a larger picture.

    IMAGE OF SERIAL NUMBER LOCATION Chrysler Hemi engine

    Note: The serial number is on the top of the block, between the valley cover and the edge of
    the block, near the water pump. It is generally centered between the two heads

    Chrysler Chrysler 300 DeSoto Dodge Dodge Truck Industrial Imperial Marine Plymouth Top of page
    Chrysler Early Hemi and/or Poly Engines
    Model Year Car Line Chamber Type Displacement Fuel Delivery Comp. Ratio Horsepower
    PP = PowerPack
    C51-8  1951 Chrysler Hemi 331 2 Barrel 7.5:1 180
    C52-8  1952 Chrysler Hemi 331 2 Barrel 7.5:1 180
    C53-8  1953 Chrysler Hemi 331 2 Barrel 7.5:1 180
    C541-8  1954 Chrysler Hemi 331 2 Barrel 7.5:1 195
    C542-8  1954 Chrysler Hemi 331 4 Barrel 7.5:1 235
    NE55  1955 Chrysler Hemi 331 N.A. 8.5:1 250
    WE55 1955 Chrysler Poly 301 N.A. 8:1 188
    WE56 1956 Chrysler Poly 331 N.A. 8.5:1/ 9:1 225/350
    WE56 1956 NA NA 331 N.A. NA 188
    NE56  1956 Chrysler Hemi 354 N.A. 9:1 280
    LE57  1957 Chrysler Poly 354 N.A. 9.25:1 295
    NE57  1957 Chrysler Hemi 392 N.A. 9.25:1 325/375(PP)
    WE57 1957 Chrysler Poly 354 N.A. 9.25:1 285/295
    WE57 1957 NA NA 354 N.A. NA 280
    58N 1958 Chrysler  Hemi 392 N.A. 10:1 345

    Chrysler Chrysler 300 DeSoto Dodge Dodge Truck Industrial Imperial Marine Plymouth Top of page
    Model Year Car Line Chamber Type Displacement Fuel Delivery Comp. Ratio Horsepower
    PP = PowerPack
    FI = Fuel Injection
    58S 1958 Unknown - Probably Chrysler Poly 354 N.A. 10:1 310
    58W 1958 Unknown - Probably Chrysler Poly 354 N.A. 10:1 290
    Chrysler 300 Early Hemi and/or Poly Engines
    Model Year Car Line Chamber Type Displacement Fuel Delivery Comp. Ratio Horsepower
    PP = PowerPack
    FI = Fuel Injection
    3NE55 1955 Chrysler 300 Hemi 331 N.A. 8.5:1 300
    3NE56 1956 Chrysler 300 Hemi 354 N.A. 9:1/10:1 340/355
    3NE57 1957 Chrysler 300 Hemi 392 N.A. 9.25:1 375
    3NE57 1957 Chrysler 300
    Limited Production-*    		 Hemi 392 N.A. 10:1 390
    58N3 1958 Chrysler 300 Hemi 392 2 4bbls
    FI    		 10:1 380 
    390 

    Chrysler Chrysler 300 DeSoto Dodge Dodge Truck Industrial Imperial Marine Plymouth Top of page
    DeSoto Early Hemi Engines
    Model Year Car Line Chamber Type Displacement Fuel Delivery Comp. Ratio Horsepower
    PP = PowerPack
    S16  1952 Desoto Hemi 276 2 bbl. 7.1:1 160
    S17  1953 Desoto Hemi 276 2 bbl. 7:1 160
    S19  1954 Desoto Hemi 276 2 bbl. 7.5:1 170
    S21  1955 Desoto Hemi 291 4 bbl. 7.5:1 200
    S22  1955 Desoto Hemi 291 2 bbl. 7.5:1 185
    S23  1956 Desoto Hemi 330 2 bbl. 8.5:1 230
    S24 1956 Desoto Hemi 330 4 bbl. 8.5:1 255
    S24A  1956 Desoto Hemi 341 N.A. 9.5:1 320
    S25  1957 Desoto Hemi 341 2 bbl. 9.25:1 270
    S26  1957 Desoto Hemi 341 4 bbl. 9.25:1 295
    S26A  1957 Desoto Hemi 345 N.A. 9.5:1 345

    Chrysler Chrysler 300 DeSoto Dodge Dodge Truck Industrial Imperial Marine Plymouth Top of page
    Dodge Early Hemi and/or Poly Engines
    Model Year Car Line Chamber Type Displacement Fuel Delivery Comp. Ratio Horsepower
    PP = PowerPack
    D44  1953 Dodge Red Ram Hemi 241 N.A. 7:1 140
    D50-1,2,3  1954 Dodge Hemi 241 N.A. 7.1:1/7.5:1 140/150
    D50A  1954 Dodge Red Ram Hemi 241 N.A. N.A. 140
    D55  1955 Dodge Poly 270 N.A. 7.6:1 240
    D553  1955 Dodge Super Red Ram Hemi 270 N.A. 7.6:1 183/193(PP)
    D500  1956 Dodge D500 Hemi 315 N.A. 9.25:1 260/295
    D63-1  1956 Dodge Poly 270 N.A. 8:1 266
    D63-2,3  1956 Dodge Poly 315 N.A. 8:1 309/316
    KD500  1957 Dodge Hemi 325 N.A. 9.25:1 285/310(PP)
    KDS 1957 Dodge Poly 325 N.A. 8.5:1 320/335
    L325/LD2 1958 Dodge Poly 325 N.A. 9:1 252/265

    Chrysler Chrysler 300 DeSoto Dodge Dodge Truck Industrial Imperial Marine Plymouth Top of page
    Dodge Truck Early Hemi and/or Poly Engines
    Model Year Car Line Chamber Type Displacement Fuel Delivery Comp. Ratio Horsepower
    PP = PowerPack
    VT-334,-336,-338 1954 Dodge Truck Poly 241 N.A. N.A. N.A.
    VT-342,-344,-346 1954 Dodge Truck Hemi 270 N.A. N.A. N.A.
    B8,C8,D8,F8,G8 1955/56 Dodge Truck Hemi 259 N.A. N.A. N.A.
    FS8,GH8,HS8 1955/56 Dodge Truck Hemi 259 N.A. N.A. N.A.
    J8,JS8,KA8,KS8 1955/56 Dodge Truck Hemi 270 N.A. N.A. N.A.
    RS,RS8,T8,V8 1955/56 Dodge Truck Hemi 331 N.A. N.A. N.A.
    VT-434,-436,-438 1955/56 Dodge Truck Poly 259 N.A. N.A. N.A.
    K8-D4,K8-D5,K8-D6 1957 Dodge Truck Hemi 315 N.A. N.A. N.A.
    S4,S5,S6 1957 Dodge Truck Hemi 315 N.A. N.A. N.A.
    VT-534,-536,-538 1957 Dodge Truck Poly 315 N.A. N.A. N.A.
    K8-D7,K8-D8,C5,C6,C7 1957 Dodge Truck Hemi 331 N.A. N.A. N.A.
    P3,P4,S7,W5,T7,T8 1957 Dodge Truck Hemi 331 N.A. N.A. N.A.
    K8-D9,T9 1957 Dodge Truck Hemi 354 N.A. N.A. N.A.
    K8-D7,K8-D8,C7,T7,T8 1957 Dodge Truck Hemi 354 N.A. N.A. N.A.
    C5, C6, P3, P4, S4, S5, S6 1958 Dodge Truck Hemi 315 N.A. N.A. N.A.
    L8-D1, L8-D2, L8-D3 1958 Dodge Truck Poly 315 N.A. N.A. N.A.
    L8-D4, L8-D5, L8-D6, WS 1958 Dodge Truck Hemi 354 N.A. N.A. N.A.
    L8-D7, L8-D8, L8-D9, C7 1958 Dodge Truck Hemi 354 N.A. N.A. N.A.
    T7,T8, T9 1958 Dodge Truck Hemi 354 N.A. N.A. N.A.
    C7,S7,T7,T8,T9 1959 Dodge Truck Hemi 354 N.A. N.A. N.A.
    M8-D6,C6,S6 1959 Dodge Truck Hemi 315 N.A. N.A. N.A.
    M8-D7,M8-D8,M8-D9 1959 Dodge Truck Hemi 354 N.A. N.A. N.A.

    Chrysler Chrysler 300 DeSoto Dodge Dodge Truck Industrial Imperial Marine Plymouth Top of page
    Industrial Early Hemi and/or Poly Engines
    Model Year Car Line Chamber Type Displacement Fuel Delivery Comp. Ratio Horsepower
    PP = PowerPack
    I/IND 20,20a,24,24a,56 N/A Chrysler Industrial N/A 331 N.A. N.A. N.A.
    I/IND 56A N/A Chrysler Industrial N/A 354 N.A. N.A. N.A.
    I/IND 18, 18a N/A Dodge Industrial Hemi 241 N.A. N.A. N.A.
    I/IND 52 N/A Dodge Industrial Hemi 259 N.A. N.A. N.A.
    I/IND 53,54 N/A Dodge Industrial Hemi 315 N.A. N.A. N.A.
    I/IND 56A1 N/A Dodge Industrial Hemi 325 N.A. N.A. N.A.

    Chrysler Chrysler 300 DeSoto Dodge Dodge Truck Industrial Imperial Marine Plymouth Top of page
    Imperial Early Hemi Engines
    Model Year Car Line Chamber Type Displacement Fuel Delivery Comp. Ratio Horsepower
    PP = PowerPack
    CE55  1955 Imperial Hemi 331 N.A. 8.5:1 250
    CE56  1956 Imperial Hemi 354 N.A. 9:1 280
    CE57  1957 Imperial Hemi 392 N.A. 9.25:1 325
    58C 1958 Imperial  Hemi 392 N.A. 10:1 345

    Chrysler Chrysler 300 DeSoto Dodge Dodge Truck Industrial Imperial Marine Plymouth Top of page
    Marine Early Hemi Engines
    Model Year Car Line Chamber Type Displacement Fuel Delivery Comp. Ratio Horsepower
    PP = PowerPack
    M44S-3  N.A. Marine Hemi 270 2 bbl.  7.6:1 155@3800
    M45S-3  N.A. Marine Hemi 354 2 bbl. 8.2:1 225@3800
    M45SP  N.A. Marine Hemi 331 4 bbl. 8.2:1 250@4400
    M45SP-3  N.A. Marine Hemi 354 4 bbl. 8.2:1 275@4400

    Marine Engine Model Plate Graphic ( Click Here )
    Chrysler Chrysler 300 DeSoto Dodge Dodge Truck Industrial Imperial Marine Plymouth Top of page
    Plymouth Poly Engines
    Model Year Car Line Chamber Type Displacement Fuel Delivery Comp. Ratio Horsepower
    PP = PowerPack
    P27  1955 Plymouth Poly 241 N.A. 7.6:1 157
    P27  1955 Plymouth Poly 259 N.A. 7.6:1 167/177
    P29  1956 Plymouth Poly 270 N.A. 8:1 180
    Hemi Blocks
    CID MODEL YEARS BORE STROKE BORE SPACING MAIN JOURNAL DIAMETER ROD JOURNAL DIAMETER CONNECTING ROD CENTER-TO-CENTER LENGTH CRANKSHAFT CENTERLINE-TO-DECK
    331 1951-1956 3.81 3.63 4.56 2.50 2.25 6.63 10.390
    354 1956-1957 3.94 3.63 4.56 2.50 2.25 6.63 10.390
    392 1957-1958 4.00 3.90 4.56 2.69 2.38 6.63 10.870
    426 Street 1966-1971 4.25 3.75 4.80 2.75 2.38 6.86 10.725


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