Exhaust questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

IOWNATRUCK · 10-09-2011, 05:36 PM

Hey everyone I just joined yesterday and im hoping il be able to get some help and also help a few people out. Im sorry if this thread is a bit repetitive as i have looked through everything but couldnt find anything with the answers i needed. Ive got a few questions and okay here it goes, Ive got a 1984 Chevy C10 Stepside and im getting dynomax bullets, Ive measured the circum. of the exhaust pipe in two different places ( one was a bend so it was a bit smaller) and i got 8 and 7.5. So i divided by pi and i believe i had gotten 2.55 and 2.39, I dont have a caliper and I was wondering if the numbers mean my truck has a 2.5 inch od? Because im sure a tape measure wasnt 100 percent accurate. if anyone has the same truck any answer will be appreciated. I also am ordering lap joint band clamps and i was curious as to what size i would need? because if the exhaust od is 2.5, and the id of the muffler is 2.5, would i need a clamp that is 2.5- 2.75? If so, ive looked and couldnt find one that says the sizes definitively, any help is appreciated, sorry its so long.
Thanks. Oh, and also if the muffler i order is a 2.5 inch id for say, would i order the 2.5 inch od pipe for the tail pipe?
Thanks.

85Bowtie · 10-09-2011, 11:25 PM

Why not just measure the I.D. of the pipe?

john_p · 10-10-2011, 08:19 PM

the supplier of the bullets should be able to answer that.. i would go to a shop and have the parts flared out at least,, then weld or have them welded.. if you're doing the welds the flares are cheap.. even if you don't spend $ at the shop, they can tell you what sizes you need to go with.. the smaller independents are more willing to talk shop..

10-09-2011, 05:36 PM	#1
IOWNATRUCK Registered User Join Date: Oct 2011 Location: Matthews, NC Posts: 129	Exhaust questions Hey everyone I just joined yesterday and im hoping il be able to get some help and also help a few people out. Im sorry if this thread is a bit repetitive as i have looked through everything but couldnt find anything with the answers i needed. Ive got a few questions and okay here it goes, Ive got a 1984 Chevy C10 Stepside and im getting dynomax bullets, Ive measured the circum. of the exhaust pipe in two different places ( one was a bend so it was a bit smaller) and i got 8 and 7.5. So i divided by pi and i believe i had gotten 2.55 and 2.39, I dont have a caliper and I was wondering if the numbers mean my truck has a 2.5 inch od? Because im sure a tape measure wasnt 100 percent accurate. if anyone has the same truck any answer will be appreciated. I also am ordering lap joint band clamps and i was curious as to what size i would need? because if the exhaust od is 2.5, and the id of the muffler is 2.5, would i need a clamp that is 2.5- 2.75? If so, ive looked and couldnt find one that says the sizes definitively, any help is appreciated, sorry its so long. Thanks. Oh, and also if the muffler i order is a 2.5 inch id for say, would i order the 2.5 inch od pipe for the tail pipe? Thanks.

10-09-2011, 11:25 PM	#2
85Bowtie Registered User Join Date: Mar 2009 Location: TN Posts: 410	Re: Exhaust questions Why not just measure the I.D. of the pipe? __________________ '69 Dodge Charger R/T 440, 727, 3.55 Sure Grip '68 Plymouth Road Runner 383, 727, 3.23 Sure Grip '89 Dodge Diplomat ex cop car 408, 727, 3.55 Sure Grip '77 Dodge Monaco ex cop car 440, 727, 2.71 '79 Dodge 'Lil Red Express pickup 360, 727, 3.55 Sure Grip '12 Dodge Challenger SRT8 392, M6, 3.92 '85 Chevrolet C-10 SWB 2wd 305, TH350, 2.73

10-10-2011, 08:19 PM	#3
john_p Registered User Join Date: Aug 2011 Location: Bradley, South Carolina Posts: 277	Re: Exhaust questions the supplier of the bullets should be able to answer that.. i would go to a shop and have the parts flared out at least,, then weld or have them welded.. if you're doing the welds the flares are cheap.. even if you don't spend $ at the shop, they can tell you what sizes you need to go with.. the smaller independents are more willing to talk shop..



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