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Looking thru a GM Tune Up manual;specs are listed for the 400 engine for the following years.-- Chev auto- thru 1976; Chev/GMC trucks- thru 1977; Olds- thru 1975 and Pontiac thru 1978.
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'71 GMC;fleetside;PB/PS/AC/CC/402 Eng./Custom Paint/110,000act miles/3 fuel tanks(52gal).
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