What to do with smog tubes??
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Freshman User
Joined: Jan 2011
Posts: 42
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What to do with smog tubes??
Hi im tryin to str8t pipe my truck completly and idk what to do with the smog tubes...im gonna put headers on it and the cats and all the stock exhaust is comin out
ps its a 302 motor
ps its a 302 motor
Cargo Master
Joined: Apr 2003
Posts: 2,408
Likes: 5
From: Parkesburg PA
Won't cause any problems. Probably won't pass emissions but doesn't sound like you're worried...
When I did heads on my 86 (EFI 302) I had them block the ports in the head. You'll probably need to leave the crossover and can remove the lines from the check valve to the pump.
When I did heads on my 86 (EFI 302) I had them block the ports in the head. You'll probably need to leave the crossover and can remove the lines from the check valve to the pump.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Sure.. remove it all meaning the tubes, the control valves, and the air pump too if you're feeling ambitious. You'll need 5/8 x 1" coarse thread bolts with copper washers to seal the holes in the back of the heads, this is important because there can't be any exhaust leaks upstream of the O2 sensor. The valves in this system are controlled by two solenoids beside the coil, these need to remain electrically connected and the vacuum lines between these and the valves plugged. Last thing is the air pump, there is nothing wrong with leaving it connected but you may want to connect the output directly to the smaller of the two cylinders on the passenger fender which is a small muffler, the larger one is the intake filter for the air pump. The other option is to remove the air pump but you'll need a shorter belt or an eliminator pulley to do that.
None of this will affect engine operation as long as the heads are plugged correctly.
None of this will affect engine operation as long as the heads are plugged correctly.
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Cargo Master
Joined: Apr 2010
Posts: 2,600
Likes: 64
From: Billings, MT
Sure.. remove it all meaning the tubes, the control valves, and the air pump too if you're feeling ambitious. You'll need 5/8 x 1" coarse thread bolts with copper washers to seal the holes in the back of the heads, this is important because there can't be any exhaust leaks upstream of the O2 sensor. The valves in this system are controlled by two solenoids beside the coil, these need to remain electrically connected and the vacuum lines between these and the valves plugged. Last thing is the air pump, there is nothing wrong with leaving it connected but you may want to connect the output directly to the smaller of the two cylinders on the passenger fender which is a small muffler, the larger one is the intake filter for the air pump. The other option is to remove the air pump but you'll need a shorter belt or an eliminator pulley to do that.
None of this will affect engine operation as long as the heads are plugged correctly.
None of this will affect engine operation as long as the heads are plugged correctly.
What about the stock cats Paul? Will they be fine without the smog pump? I have the motor out of my '92, and was going to do shorties and a nice exhaust, but now I'm being bent over the counter, and won't have the $. Will I be OK running stock exhaust w/o the smog pump? I really don't want to put all that crap back on only to pull it off later. I don't care if they are less effective, only if they will become plugged.
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Cargo Master
Joined: Apr 2010
Posts: 2,600
Likes: 64
From: Billings, MT
Right, but they will just pollute more, or they will plug up? I would really like to know from someone who has done it. I will only be running it this way until funds recover and I can do an exhaust on it.
Cargo Master
Joined: Apr 2010
Posts: 2,600
Likes: 64
From: Billings, MT
I was wondering about running no smog pump with the STOCK CATS though. I'm thinking the smog pump was just a band-aid fix to help them pass emissions, but it could also be a band-aid fix to help them live, I don't know?
