Quote:
Originally posted by TIMSPEED
My 75 C10 SWB MIGHT have originally had a cat...I dunno now though...if you guys say that it will say "CATALYST" on the radiator core support Emissions sticker..then I DIDN'T originally have a cat, cuz my Emissions sticker only says EGR, EFE, and OC Exhaust". But I figured OC Exhaust meant a cat, but maybe it doesn't...
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check around your fuel cap and on your fuel guage for unleaded fuel warning
i had a 78 big 10 that was 6200lb and it had no cat but im scrapping a 79 big10 and its got a cat and both trucks are 350/th350 12 bolt trucks, i forgot GVW of the 79, ill have to look
if your GVW is over 6,001lbs then it definitely had no cat that year, look on your VIN tag for the GVW