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?

u2slow · 05-11-2001, 05:59 PM

My father's 79 20-series crewcab camper special 454 had cats, A.I.R, smog pump, EGR, unleaded fuel, charcoal canisters, 2-into-1-into-2 exhaust. You name it, it had it.

My buddy's '80 K20 Custom had a PCV valve and that's it. All factory.

I've heard 1-tons went right till 85 or so without any cats.

The bottom line is, it depends on how your truck was originally outfitted. There are at least three levels of emissions equipment I know of: Federal, California, and High-altitude. It seem the equipment for each level depends on the particular model year.

05-11-2001, 05:59 PM	#10
u2slow Web Wheeler Join Date: Jan 2000 Location: BC, Canada, eh? Posts: 388	My father's 79 20-series crewcab camper special 454 had cats, A.I.R, smog pump, EGR, unleaded fuel, charcoal canisters, 2-into-1-into-2 exhaust. You name it, it had it. My buddy's '80 K20 Custom had a PCV valve and that's it. All factory. I've heard 1-tons went right till 85 or so without any cats. The bottom line is, it depends on how your truck was originally outfitted. There are at least three levels of emissions equipment I know of: Federal, California, and High-altitude. It seem the equipment for each level depends on the particular model year. __________________ '66 C10 longstep - Clifford equiped '84 C20 Suburban 6.2L - awaiting 4x4 conversion '91 V3500 Crewcab - awaiting diesel swap