First Year for Cat. Converters? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Trouper · 09-04-2003, 06:13 PM

I just put 305 in my 1985 Scottsdale, and am having trouble finding a muffler shop that will do my exhaust work. I put in a 305 TBI, and swapped it over to carb, but wanted to leave the stock exhaust manifolds on it. (It is the 2 bolt exhaust that was on cast iron heads of the 91-93 Caprices.) I already have dual exhaust from the firewall back, but needed some pipe run from the manifolds to the pipes. Since it's an 85, and the previous owner cut off the cat, no shop will touch it unless I put a cat back on it. All I need is about 2 foot of pipe run from each manifold to the already run duals.... what is so hard about that?

So what are my options now?

By the way, what was the first year for cat's on the Chevy trucks?

79BIG10 · 09-04-2003, 11:08 PM

I'm thinking 78 or 79 but could be wrong on this. My 79 has them on there.

Now on the exhaust the reason it that if you have a emissions test you have to a cat on there. Also it could be that if the muffler shop gets caught installing it without a cat then they could get fined. If anything find somone out in the smaller towns and they seem to be more easy to work with.

Russell · 09-05-2003, 12:09 AM

Do it yourself if you don't need a professional job... Its not that difficult if you know how to use a mig welder, or a couple exhaust clamps...

78chevstepside · 09-05-2003, 12:16 AM

1974 unleaded gas arived. !/2 ton chevys had cats . 3/4 tons and up latter.

09-04-2003, 06:13 PM	#1
Trouper Registered User Join Date: Jul 2003 Location: Round-a-bout Memphis, TN Posts: 27	First Year for Cat. Converters? I just put 305 in my 1985 Scottsdale, and am having trouble finding a muffler shop that will do my exhaust work. I put in a 305 TBI, and swapped it over to carb, but wanted to leave the stock exhaust manifolds on it. (It is the 2 bolt exhaust that was on cast iron heads of the 91-93 Caprices.) I already have dual exhaust from the firewall back, but needed some pipe run from the manifolds to the pipes. Since it's an 85, and the previous owner cut off the cat, no shop will touch it unless I put a cat back on it. All I need is about 2 foot of pipe run from each manifold to the already run duals.... what is so hard about that? So what are my options now? By the way, what was the first year for cat's on the Chevy trucks? __________________ 1985 Chevrolet Scottsdale SWB White w/blue interior 131,000 miles "Cop Car Engine" 305 TBI to gas swap from a 1993 9C1 w/Rochester 2bbl for gas mileage... Last edited by Trouper; 09-04-2003 at 06:16 PM.

09-04-2003, 11:08 PM	#2
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,774	I'm thinking 78 or 79 but could be wrong on this. My 79 has them on there. Now on the exhaust the reason it that if you have a emissions test you have to a cat on there. Also it could be that if the muffler shop gets caught installing it without a cat then they could get fined. If anything find somone out in the smaller towns and they seem to be more easy to work with. __________________ 1979 Chevrolet Bonanza Big10 "Tootsie Roll" 1985 Chevrolet Silverado (wife's) Member of the Southern Bowties Club "Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson

09-05-2003, 12:09 AM	#3
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	Do it yourself if you don't need a professional job... Its not that difficult if you know how to use a mig welder, or a couple exhaust clamps... __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

09-05-2003, 12:16 AM	#4
78chevstepside Registered User Join Date: Nov 2002 Location: lacenter, washington Posts: 718	1974 unleaded gas arived. !/2 ton chevys had cats . 3/4 tons and up latter.



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