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Old 01-22-2003, 07:23 AM
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Post headers for rv towing

my GMC pickup is used primarily for towing my 3900lb RV. It has a 350 (with carb) and 700r4 tranny. Right now it is smogged with single exhaust. Seeing as how it needs new exhaust, I'm thinking of putting headers on and thinking that maybe that will give me a little HP boost which will come in handy for towing. Also, I plan to desmog it at the same time. I note the stock system is drilled for the oxygen sensor. I'm assuming I will need to drill the headers for installing the sensor. Assuming this is correct, where should the sensor be on the header? Im thinking at the collector. Is this correct?

appreciate any help
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Old 01-22-2003, 07:34 AM
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Correct. As close to the engine as possible but still picking up exaust from all cylinders.
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Old 01-22-2003, 11:02 AM
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You know that what you propose is not legal, right? If they see what you have done at the smog control station, they can refuse to let you pass inspection. At least that is what I am told here in Washington and I believe it is a federal not a state law.
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Old 01-22-2003, 03:28 PM
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Maybe check with your local laws there just in case u make a mistake when u go for a safety check. Also if your trans does not have a seperate trans cooler i'd put one on before u fry your trans from the heat it creates when towing. The trans cooler is cheaper to buy then a new trans.
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Old 01-22-2003, 03:51 PM
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I think your emission problems really depend on the year of the vehicle.I lived in Seattle for over 30 years and never had someone pop my hood or look under the car.I know it's a newer vehicle due to the o2 sensor,but I think as long as it isn't too loud you'll be fine,emission police wise. :p
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Old 01-22-2003, 05:07 PM
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hey nothing an new crisp $20. can't fix
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Old 01-22-2003, 05:57 PM
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They don't bother us with safety/emission inspections in Mich anymore. But the people i know that have r.v's or tow vehicles HATE headers, they can't keep them tight and they rust out in two-threeyears, noisy etc.
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Old 01-22-2003, 07:16 PM
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my b.s.... first headers i had were dynacraps. DON'T waste your money. puredee crappola. save a few bucks and get the best headers you can afford. was/am running hedmans when i parked it. also got the locking bolts from jegs, didn't have more than 7-8k miles on 'em so I really can't say yet if they are worth the money.They werent loose at engine pull time. bottom line I'd guess is select the header with the thickest flange you can find. and you can find O2 sensor bungs toweld in to your header too.
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Old 01-23-2003, 11:15 AM
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I plan to go with ceramic coated headers, don't want to do this all over again in 3 years. Also, heaven forbid violating emission laws. I use my rv tow vehicle for racing on a track only, tow it there and back.
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