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02-06-2010, 02:32 PM | #1 |
Registered User
Join Date: Jan 2007
Location: pittsburg kansas
Posts: 894
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exshaust question for bbc
Im sure some of you know i am rebuilding my supercharged bbc. While it was out i wanted to take car of the ground clearence issue with the headers. I ordered a set of the headers "joker" from this site was making just for these trucks. they are 2 inch primarys with a 3.5 inch collector. I currently have 1-7/8 primarys with 3 inch colletors and 3 inch pipe all the way back. I am having a hard time figuring out what to do.
this is mostly going to be a street driven with a few track passes a year. I think 3.5 inch exshaust all the way back might be a little to much, and cause me to loose some lowend torque. Plus my 3 inch and mufflers only have about 1000 miles on them. should i run new 3.5 inch and get new mufflers, or get a reducer at the collector down to 3 inch? whats your opinions? thanks |
02-06-2010, 02:39 PM | #2 |
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Join Date: Mar 2008
Location: Salt Lake City UT
Posts: 441
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Re: exshaust question for bbc
Are you on a budget?
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02-06-2010, 04:14 PM | #3 |
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Join Date: Jan 2007
Location: pittsburg kansas
Posts: 894
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Re: exshaust question for bbc
i have about 6500 in my motor now. so no and yes, i mean i dont want to spend 1500 on a exshaust, but i can give up 300 to 500 for a new exshaust system if need be
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02-06-2010, 05:01 PM | #4 |
The Engine Whisperer
Join Date: Sep 2006
Location: Ohio
Posts: 770
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Re: exshaust question for bbc
i think you'll be more than happy staying with the dual 3in setup you have now.
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02-06-2010, 05:05 PM | #5 |
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Join Date: Jan 2007
Location: pittsburg kansas
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Re: exshaust question for bbc
but will a 3.5 inch collector reduced down be ok
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02-06-2010, 09:42 PM | #6 |
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Join Date: Nov 2007
Location: Bay Area, Ca
Posts: 2,841
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Re: exshaust question for bbc
Put dual 3.5" cut outs 16-18" behind the collector, then reduce it to your 3". When your at the track, uncork it. When your on the street, leave it corked. Cheaper than running a full new system with the benifits of getting everything you can out of it.
__________________
------Motor---------------Bottle 60'---1.53---------------1.41 1/8---6.58 @ 105.92----5.87 @ 118.41 1/4---10.38 @ 126.97----9.24 @ 142.49 |
02-07-2010, 09:49 AM | #7 |
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Join Date: Jul 2007
Location: Ottawa Ontario Canada
Posts: 1,156
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Re: exshaust question for bbc
3.5 reduce to 3" and you will be OK.
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02-07-2010, 10:55 AM | #8 |
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Join Date: Jan 2008
Location: St.Petersburg,Fl
Posts: 1,267
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Re: exshaust question for bbc
Unless your\e running a real big cubic inch motor, I'd reduce it down to 3". I like running mine through the mufflers at the track. I think going fast and being quiet is cool. Good luck
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02-19-2010, 01:35 PM | #9 |
Account Suspended
Join Date: Jan 2007
Location: Tucson
Posts: 2,183
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Re: exshaust question for bbc
I run 1 7/8 in tubes into a 3 in collector that stops down to 2.5 in for my ZZ572. Stay with the 3 in to save $$ cause you probably will not notice the loss in low end torque.
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