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Author Topic: true dual exhaust  (Read 8159 times)

Offline 1973c20

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  • Posts: 56
Re: true dual exhaust
« Reply #15 on: September 23, 2007, 02:49:55 pm »
Alrighty so now that we have that settled, I wonder if JImmy38fan figured out what he's going to do yet.
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Offline 75 C20

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  • Posts: 372
Re: true dual exhaust
« Reply #16 on: September 23, 2007, 08:04:33 pm »
not to steal this post but my 75 didnt have a cat on
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1975 Custom Deluxe 20 350 SM465 2WD Longbed
1979 Custom Deluxe 20 400 SM465 2WD Longbed
1968 Custom Sport Truck 20 327 TH400 2WD Longbed
1985 Silverado 10 305 700R4 2WD Longbed
1969 Pontiac GTO 400 Turbo350
2008 GMC 2500HD 6.0 6spd 4X4 Longbed

Offline 1973c20

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  • Posts: 56
Re: true dual exhaust
« Reply #17 on: September 24, 2007, 11:37:56 am »
was the exhaust stock on it? if so maybe they implemented it mid-year.
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Offline ccz145a

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  • Posts: 1393
Re: true dual exhaust
« Reply #18 on: September 24, 2007, 12:58:25 pm »
I believe in 1975 that if your truck was over a certain gross weight then cats were exempt. I have a half-ton with the towing pkg 6500gvw -- cats were not required.
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1975 C10 Silverado LWB, 454CID, TH400, 10bolt 3.42
11MPG Downhill w/tailwind (but there ain't no hills here)

Offline 1973c20

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  • Posts: 56
Re: true dual exhaust
« Reply #19 on: September 24, 2007, 10:44:27 pm »
Well as previously stated, cats were for vehicles under 6100gvw. And because of that, then I would assume 75C20 doesn't have one because it's a 3/4 ton. See, learning is a good thing! :P
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