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Oldsmobile Popular V8 codes

307  350  403

260

77-78          260 BLOCK ID #         VIN CODE "F,8"             HEAD ID #
554965 557751
     554715, 556280, 560867, 563406

Notes: W/A.I.R. automatic transmission applications only

307

80-84          307 BLOCK ID #         VIN CODE "Y"             HEAD ID #

                       3161-5A                         3317

Notes: CARB, uses flat lifters, press fit piston pins, A/T applications only

85-89          307 BLOCK ID #         VIN CODE "Y"             HEAD ID #

4790 GM5.0LG 6509
                         0142

Notes: CARB, uses roller lifters, floating piston pins, cast iron or stainless exhaust manifolds

85-90          307 BLOCK ID #         VIN CODE "Y"             HEAD ID #

4790 GM5.0LG 6509
                        

Notes: CARB, uses roller lifters, floating piston pins,  stainless exhaust manifold only

350

68-72          350 BLOCK ID #         BLOCK ONLY

                       395558                             

Notes: CARB, Automatic only

73-75          350 BLOCK ID #         VIN CODE "K"             HEAD ID #

                       395558          

Notes: CARB, 7/16" head bolts, Automatic only

76-80          350 BLOCK ID #         VIN CODE "R"             HEAD ID #

554964 557752 554963-A
                      

Notes: CARB, 1/2" head bolts, Automatic only

403

77-79          403 BLOCK ID #                                         HEAD ID #

554990 557265-4
                       554717

Notes: NONE

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