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Engine Identification

Engine code letter is suffix of Engine Identification Number. Number is stamped on pad at front top center of cylinder block, forward of intake manifold.

CHEVROLET & GMC

Application Man. Trans. Auto. Trans.
454" (7.4L) 4-Bbl. (VIN S)
  All Models TRT, TRZ TRR, TRS, TRU, TRW, TRX
454" (7.4L) 4-Bbl. (VIN W)
  All Models TRC TRF, TRH
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