LEMON Manuals: Even more car manuals for everyone
Home >> Pontiac >> 1970 >> GTO Base, 6.6L Eng, Eng CD WS, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Tune-Up >> Tune-Up - V8 >> Engine Identification

Engine Identification

Engine identified by a letter code stamped below the engine production number on front of block, just below right hand cylinder head. The sixth digit of the Vehicle Identification Number (located on top of instrument panel and visible through windshield) designates model year.

Engine Code Letters

Engine Synchro-mesh Auto. Trans.
350" 255 HP WU, W7 YU, X7
400" 265 HP   XX, YB
290 HP WE YD
330 HP WT(1) YS(1), XV, XZ
345 HP Ram Air III WS(1) YZ(1)
350 HP WT(2), WX YS(2), XH
366 HP Ram Air III WS(2) YZ(2)
370 HP Ram Air IV WW XP
370 HP Ram Air Super Duty WH XN
455" 360 HP   YH
370 HP WA, WG YC, XF
(1) Firebird
(2) Tempest & G.T.O.