In need of emission system help for my 76 GMC - The 1947 - Present Chevrolet & GMC Truck Message Board Network

streetmaster42 · 11-12-2007, 10:30 PM

Im kinda dealing with a tuffy of a problem with the emission system on my 76 GMC. The problem is im not sure exactly what all i need to pass the peekaboo test in the County i live in here in PA. The county of Fayette, is one of 42 that dont require you to pass an emissions test. You just have to pass the visual anti-tampering check test, before they will slap that sticker on. I got My 1976 GMC Sierra back in 1998, came factory with an I6, and a 3 on the tree. I tore it all apart that year to do a ground up resto, because there was just to much rust to mention. I since then replaced the motor with a 350sbc, TH350, a painless wiring kit, did the frame, got a better bed that i just tore back apart due to rust, and im redoing the crappy job some schmuck done on my rockers and cab corners, I-NO

LOL. Ive got the cat for the exhaust, im just not sure what emissions crapp they put on the 76 modles with 350sbc. (Oppinions please) sombody please

Ivan D. · 11-12-2007, 11:29 PM

You got a shortbed, right, is it a 1/2-ton or a 3/4-ton? Halftons are considered light-duty and therefore got tons of emissions BS, not so much the case with the heavy-duty trucks such as the Big 10s and the 3/4-tons and 1-tons.

streetmaster42 · 11-13-2007, 01:45 AM

Yeah man its a 1/2-ton, shortbed basicly a hinds 57 mix, titled as a 76, 76 frame and vin plate, 86 cab with a 73-87 painless wiring kit, 79 bed, 84 350sbc, not sure what the TH350's out of. I havent really kept up with all the emissions laws because around town here, there used to be a bunch of those lickem and stickem inspection guys around. But there far and few in between thiese days, either got busted or just went out of buisness. So now i feel like im a day late and a dollar short. I just figured id get an idea of just what exactly was on a 76 so i dont start throwing more stuff in there than i need. I dont believe that i need an air pump on it, or maybe i do

. I do know that ill need an egr valve, which meen ill have to chuck the Eddy EPS performer manifold for the egr type

. Plus ill need one of those charcoal canisters. Just looking for more info i guess.

**old Rusty C10** · 11-13-2007, 11:40 AM

i had a 76 chevy longbed half ton that came bone stock about five years back.. and it had NO emmissions stuff at all , not even a catalyctic and it passed emmissions in NJ from the state, which is also a visual inspection
if you have any doubts why not askat the inspection station

streetmaster42 · 11-13-2007, 12:26 PM

Thanx (old rusty C10) for your input

but i wander if your bone stock motor had one of those EGR's, ands the charcoal canisters on it. I was planning on one of those EDL-9972 Q-Jets from summit, along with an EDL-3701 manifolds that have a hookup for the EGR. Besides my carb is an Edelbrock 1405 performer and only 600 cfm, which is messin up already, and that Q-Jet has 750 cfm. The comba im thinkin of should run just as well if not better than the 600 cfm on the Performer EPS thats on the motor right now.

11-12-2007, 10:30 PM	#1
streetmaster42 Registered User Join Date: Aug 2007 Location: Uniontown,PA Posts: 60	In need of emission system help for my 76 GMC Im kinda dealing with a tuffy of a problem with the emission system on my 76 GMC. The problem is im not sure exactly what all i need to pass the peekaboo test in the County i live in here in PA. The county of Fayette, is one of 42 that dont require you to pass an emissions test. You just have to pass the visual anti-tampering check test, before they will slap that sticker on. I got My 1976 GMC Sierra back in 1998, came factory with an I6, and a 3 on the tree. I tore it all apart that year to do a ground up resto, because there was just to much rust to mention. I since then replaced the motor with a 350sbc, TH350, a painless wiring kit, did the frame, got a better bed that i just tore back apart due to rust, and im redoing the crappy job some schmuck done on my rockers and cab corners, I-NO LOL. Ive got the cat for the exhaust, im just not sure what emissions crapp they put on the 76 modles with 350sbc. (Oppinions please) sombody please

11-12-2007, 11:29 PM	#2
Ivan D. glamoros piece o' lowlife Join Date: Mar 2007 Location: Redford, MI Posts: 1,164	Re: In need of emission system help for my 76 GMC You got a shortbed, right, is it a 1/2-ton or a 3/4-ton? Halftons are considered light-duty and therefore got tons of emissions BS, not so much the case with the heavy-duty trucks such as the Big 10s and the 3/4-tons and 1-tons. __________________ The more I drink, the more I drink, the more I drink... diesel, reg cab, long bed, 4 across the rear, single stack, wooden stakes, and lotsa lights - the Hay Express

11-13-2007, 01:45 AM	#3
streetmaster42 Registered User Join Date: Aug 2007 Location: Uniontown,PA Posts: 60	Re: In need of emission system help for my 76 GMC Yeah man its a 1/2-ton, shortbed basicly a hinds 57 mix, titled as a 76, 76 frame and vin plate, 86 cab with a 73-87 painless wiring kit, 79 bed, 84 350sbc, not sure what the TH350's out of. I havent really kept up with all the emissions laws because around town here, there used to be a bunch of those lickem and stickem inspection guys around. But there far and few in between thiese days, either got busted or just went out of buisness. So now i feel like im a day late and a dollar short. I just figured id get an idea of just what exactly was on a 76 so i dont start throwing more stuff in there than i need. I dont believe that i need an air pump on it, or maybe i do . I do know that ill need an egr valve, which meen ill have to chuck the Eddy EPS performer manifold for the egr type . Plus ill need one of those charcoal canisters. Just looking for more info i guess.

11-13-2007, 11:40 AM	#4
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,310	Re: In need of emission system help for my 76 GMC i had a 76 chevy longbed half ton that came bone stock about five years back.. and it had NO emmissions stuff at all , not even a catalyctic and it passed emmissions in NJ from the state, which is also a visual inspection if you have any doubts why not askat the inspection station __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

11-13-2007, 12:26 PM	#5
streetmaster42 Registered User Join Date: Aug 2007 Location: Uniontown,PA Posts: 60	Re: In need of emission system help for my 76 GMC Thanx (old rusty C10) for your input but i wander if your bone stock motor had one of those EGR's, ands the charcoal canisters on it. I was planning on one of those EDL-9972 Q-Jets from summit, along with an EDL-3701 manifolds that have a hookup for the EGR. Besides my carb is an Edelbrock 1405 performer and only 600 cfm, which is messin up already, and that Q-Jet has 750 cfm. The comba im thinkin of should run just as well if not better than the 600 cfm on the Performer EPS thats on the motor right now.



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