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10-23-2017, 11:22 AM | #1 |
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Join Date: Dec 2015
Location: Pasadena, MD
Posts: 344
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Exhaust Manifold Flange Size
He guys,
I bought some after market Rams Horn manifolds last year and just got around to installing them this weekend. They were pretty easy to install and everything went smooth. I am dropping the truck off at the exhaust shop Friday to get the tubes ran. I have some quiet Walker mufflers to hand over but I do not have the collector flanges that bolt to the manifolds. They looked like they were the ball type flanges. I am not an exhaust expert so I am trying to figure out if.... - There is a difference between the donut type and the ball type flanges? - What size is the flange? 2.5"? - Would a decent exhaust shop already have what they need to transition from the manifold to the pipes? I plan on calling them in a little bit to verify some of these questions but I wanted to see what you all had to say too. Thanks,
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1972 K-20 Custom Camper 1971 K2500 Custom Camper (Sold) 2014 GMC 2500HD DMAX |
10-23-2017, 11:53 AM | #2 |
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Join Date: Dec 2015
Location: Pasadena, MD
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Re: Exhaust Manifold Flange Size
Looks like the flange on the manifolds is a 2.5" and donut style. Can I use a standard reducer flange with a donut? Something like this?
https://www.summitracing.com/parts/big-10005flt
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1972 K-20 Custom Camper 1971 K2500 Custom Camper (Sold) 2014 GMC 2500HD DMAX |
10-23-2017, 08:37 PM | #3 |
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Join Date: Nov 2014
Location: Bigfork, Montana
Posts: 1,137
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Re: Exhaust Manifold Flange Size
No - leakage will occur!
I used a pair of Walker 41248 elbows coupled with Walker 31883 flanges & Fel-Pro 60986 donuts. I sawed up the elbow to get the desired fit The exhaust should be able to form the end for the donut and the elbow. |
10-23-2017, 11:45 PM | #4 |
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Join Date: Dec 2015
Location: Pasadena, MD
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Re: Exhaust Manifold Flange Size
Thanks for the info!
How much of this should a decent exhaust shop be able to handle. I feel like the flared tube at least should be able to be fabled up in the shop. I will pick up the donuts and rings just to be safe.
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1972 K-20 Custom Camper 1971 K2500 Custom Camper (Sold) 2014 GMC 2500HD DMAX |
10-24-2017, 10:05 AM | #5 |
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Join Date: Nov 2014
Location: Bigfork, Montana
Posts: 1,137
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Re: Exhaust Manifold Flange Size
A decent shop should have (or have quick access to) any part needed to make your exhaust. Post up some pics when done!
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10-24-2017, 11:39 AM | #6 |
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Join Date: Dec 2015
Location: Pasadena, MD
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Re: Exhaust Manifold Flange Size
Will do....thanks.
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1972 K-20 Custom Camper 1971 K2500 Custom Camper (Sold) 2014 GMC 2500HD DMAX |
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