The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Which of the '73-'80 Chevy's had catylitic converters and which didn't?

78SilveradoSWB · 02-05-2003, 10:04 PM

I have a 1978 C-10 equipped with a 454 engine. It was built in the first part of 1978 and did not have a cat converter. It is not a California truck either. I believe in the latter part of the 78 model year, they added the gas doors and the cats, and other emission stuff. A good clue is the unleaded fuel only stickers on the dash and gas fill. Leaded gas is a no-no for cats (and felines too )

02-05-2003, 10:04 PM	#17
78SilveradoSWB Senior Member Join Date: Apr 2002 Location: Beaverton, OR Posts: 1,615	I have a 1978 C-10 equipped with a 454 engine. It was built in the first part of 1978 and did not have a cat converter. It is not a California truck either. I believe in the latter part of the 78 model year, they added the gas doors and the cats, and other emission stuff. A good clue is the unleaded fuel only stickers on the dash and gas fill. Leaded gas is a no-no for cats (and felines too ) __________________ Mitch 1978 Chevrolet Silverado C 10 454 BB, TH400 Last edited by 78SilveradoSWB; 02-05-2003 at 10:07 PM.