BUICK CASTING NUMBER ID CHART

'64-'66 400TH TO '57 TO '63 NAILHEAD

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ENGINE IDENTIFICATION

The 445? The label on the motor refers to the torque rating, 445 ft.-lb. This was confusing to buyers when the cars were new, it is still confusing to restorers 35 years later.  The engine is a 401 cid. You may also find 465 which would identify a 425 cu. in. Buick.  The VIN does not describe the engine data.  The engine production code, which is stamped on the front of the block near where the head attaches, does give engine data.  The number is in the form AB123.  The engine serial number will also be stamped on the block somewhere nearby.  It will be the last 8 characters of the VIN and will tell if the engine is the one which came in the car. 

Do you have casting numbers that don't show on our site? Send them to us!

Buick was powered by a L-8 (eight in a row makes 'em go) in all models up to and including 1952.  In 1953 the V-8 (nailhead) was introduced in all models except the Special which continued to use the 263 inch L-8 for that year.  Since 1935 the big eight appeared in many displacements, starting with 233, 235, 278, 345 in 1935 and adding 320  in '36, 248 in '37.  The 248  and 320 then ran uninterrupted until 1950 with the introduction of the 263.

 

You can identify most NAILHEAD engines from this list; however the letter codes are more accurate.  Unfortunately the letter/number codes prior to 1961 were hit and miss or frequently incomplete:

 

Block Cast #     Year         Displacement

 

1169334           56 - 59       322 Chev Truck

1173201           59 - 61       364

1174372           59 - 61       364

1185484           59 - 60       401

1185404           61 - 66       401

1196546           61               401

1196547           61               364

1340146           63 - 66       425

1346046           61 - 66       401

1349046           62 - 66       401

1354713           64 - 66       425

1354714           64 - 66       425

1364704           63 - 66       425

1364705           64 - 66       401/425

1364707           63               425

1364714           64 -66        401

 

This is not a complete list, but should contain the most common casting numbers used.

 

Year           H1, Type                                           Code

 

1959          V-8  364*                                         3F

                   V-8  401*                                         4F

 

1960          V-8  364*Standard engine              3G

                   V-8 364*                                          L3G low comp, engine

                                                                              "Regular gas option" auto trans

                   V-8 401*                                          4G

 

1961          V-8 215 Standard engine                 H

V-8 215                                            LH low comp. engine

V-8 364*                                          3H

V-8 401*                                          4H

 

1962          V-6 198                                             6I

                   V-8 215                                             I

                   V-8 215                                             HI hi comp. engine

                   V-8 401*, 2bbl                                 2I

                   V-8 401*, 4bbl                                 4I

 

Year           Engine                 Type                     Code

 

1963          V-6 198                                             JL

                   V-8 215                                             JM

                   V-8 215               HP                         JN

                   V-8 401*             2bbl                      JR

                   V-8 401*             4bbl                      JT

                   V-8 425*             4bbl                      JW

                   V-8 425*             2X4bbl                 JX

 

1964          V-6 225               Std.Eng                KH

                   V-6 225               low comp             KJ

                   V-8 300               Std.Eng.               KL

                   V-8 300               low comp             KM

                   V-8 300               Std. Eng.              KP

                   V-8 300               low comp             KR

                                                (export)

                   V-8 401*                                          KT

                   V-8 425*             4bbl                      KW

                   V-8 425*             2X4bbl                 KX

 

1965          V-6 225                                            LH

                   V-8 300               Std. Eng.             LL

                   V-8 300               HP                        LP

                   V-8 400 (401)*  GS                        LR

                   V-8 401*                                          LT

                   V-8 425*             4bbl                      LW

                   V-8 425*             2X4bbl                 LX

 

1966          V-6 225                                            MH

                   V-8 300                                            ML

                   V-8 340               low comp            MX

                   V-8 340               2bbl                     MA

                   V-8 340               4bbl                     MB

                   V-8 400*             GS 401                MR

                   V-8 401*                                          MT

                   V-8 425*             4bbl                     MW

                   V-8 425*             2X4bbl                 MZ

 

 

Text Box: Head Cast #      Year             Displacement
1165549            54 - 56          264/322
1166349            54 - 56          264/322
1168930            56                 322
1169349            56                 322
1172889            59 - 60          364/401
1175109            56 -59           322 Chev Truck
1185485            61 - 66          364/401/425
1190415            62 - 66          364/401/425
1196914            59 - 66          364/401/425
1374603            64 - 66          401/425
1376912            66                 401/425
 
 

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