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300 "C" identification

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Old 07-07-2014, 06:17 AM
piperig78 piperig78 is offline
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300 "C" identification

Hello I have a 1978 300 I-6 in a 2wd f150. The factory emissions label on the valve cover says 300 "C" 1X100 D8TE-9C485 AYB. The parts stores around here and on line only ask if its a "B" or "K" code 300. Anybody have this same problem, or can shed some light on what the "C" stands for? California emissions maybe? Thanks
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Old 07-07-2014, 07:54 AM
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These would have been the emissions calibration codes for the 300 six (4.9L) in 1977 - 1978 ..

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Old 07-24-2014, 02:34 AM
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What exactly is the calibration code used for? Is it for smog tests?
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