61 64 Pass 283 A standard 57 59 Pass exc 348 1559493 A R hot plug continuous city oper AC 45 14 MM 56 Pass 61 Pass 6 cyl exc Taxi 61 64 Pass 283 standard 57 59 Pass exc 348 5612371 A Fl hot plug continuous city oper extended shield AC 45S 14 MM 57 Pass 62 Pass exc 327 409 normal service 59 Pass exc 348 Taxi 1559494 A R city type oper AC 46 14 mm Note 1 58 Pass w H L Cam 348 exc 3 ZBC 58 Pass 3 2BC w H L Cam 2nd design water cooled 59 Pass 348 cold plug H D oper 60 61 Pass H L Cam w H Per Sp H Per 348 61 63 Pass 409 exc dual 4BC 64 Pass 396 409 5612241 A R hot plug city type driving AC 43N 14 MM 58 Pass 3 2BC w H L Cam lst design 5612140 A R continuous high speed AC 42 1 14 mm Note 1 59 Pass 348 60 61 Pass 348 exc H L Cam H Per Sp H Per 5612240 A R normal service AC 44N 14 MM 63 64 Pass 153 194 230 250 5612630 A R standard AC 46N 14 MM When individual driving conditions warrant different heat range plugs may be used by selecting higher type Nos for hotter and lower type Nos for colder plugs as necessary NOTE 1 May be used on previous models using 14MM plugs not equipped with boots 2 271 GASKET Spark Plug Seat 38 40 Pass 49 64 Pass 5612328 A R Vu l D x Vu O D 14 MM chrome w retention dimple Note 1 NOTE 1 Ream or remove internal projections when using on long reach plugs 38 64 Pass 1555475 A R 14 MM chrome less retention dimple l 41 48 Pass 1555492 6 z l D x Vis 0 D 10 mm copper 2 273 WRENCH Spark Plug 38 40 Pass 49 64 Pass 3708444 1 hex 4V length 1970 CHEVROLET MOTOR DlVlSlON GENERAL MOTORS CORPORATION P A 30 2 7 2 270 2 273