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Dead Parrot · 10-12-2021, 06:26 PM

In the mid 70s, light duty trucks got all the emissions equipment including cats. Heavy duty didn't. Fairly common for C10s to be ordered as heavy duty for that reason.

My 75 C10 was setup that way. 6200lb GVWR, no cats, fuel openings setup for the leaded size nozzles.

The EPA sticker if present, should reflect the Heavy Duty Emissions setup.

10-12-2021, 06:26 PM	#2
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,495	Re: 1976 Scottsdale 20 1/2 ton? In the mid 70s, light duty trucks got all the emissions equipment including cats. Heavy duty didn't. Fairly common for C10s to be ordered as heavy duty for that reason. My 75 C10 was setup that way. 6200lb GVWR, no cats, fuel openings setup for the leaded size nozzles. The EPA sticker if present, should reflect the Heavy Duty Emissions setup.