Exhaust recommendations?
Thread Starter
Race Director
Joined: Aug 2004
Posts: 10,628
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From: Duvall, WA
Exhaust recommendations?
I have a '71 convertible. My 14 year old son and I are building a new 355 for it. After some grinding, the bare block is ready to go to the machine shop. The stock L48 has stock exhaust manifolds and exhaust plus an H pipe and Magnaflow mufflers. The new engine will make around 400 hp with AFR 195 heads, a roller cam, 10.2:1 compression. I am looking for recommendations for headers and exhaust including the mufflers. Performance is a priority, but I don't want to go deaf on our annual 800 mile drive from Seattle to Napa.
Race Director
Joined: Jan 2000
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From: Corsicana, Tx
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Go for full length ones and look for ball/socket collectors. Eliminates the 3 bolt flanges that hang too low and gaskets that are prone to leaking.
1-5/8" is probably good for you..but 1-3/4" won't hurt a thing and give you room for growth and more Hp later on.
JIM
1-5/8" is probably good for you..but 1-3/4" won't hurt a thing and give you room for growth and more Hp later on.
JIM
Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
For what your describing as important to you. Hedman has what they call an elite header it has thicker then normal head flanges and tubing, ball flanges and thermal coating 68308 should fit your car $325.00 at www.summitracing.com. The elite header uses 3/8 head flange and 14 gauge tubing where most average headers use thinner 5/16 head flange and 16 gauge tubing. They use 1 5/8 primary tubes big enough for 400 hp.
Last edited by Little Mouse; Nov 26, 2012 at 11:42 AM.
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
http://www.stans-headers.com/tri_y.htm
Click on 109Y. Man, I want a set of these headers so bad, I'd be willing to punch a cute, adorable dolphin right in the face for a set!
Keep the shiny side up!
Scott
Click on 109Y. Man, I want a set of these headers so bad, I'd be willing to punch a cute, adorable dolphin right in the face for a set!
Keep the shiny side up!
Scott
Melting Slicks
Joined: Dec 2009
Posts: 3,233
Likes: 657
From: Thunder Bay
Those are sweeeeeeet headers! If I'd known about those when I bought mine, I would probably have the Stan's instead. How much do they want for them? There aren't any prices on the website.
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
I'm sorry! Really! I have a really weird sense of humor, plus I've had a couple of martinis, and I think my Mom dropped me a couple of times when I was a baby, so cut me some slack, OK?
Seriously though, I am not sure why there is no price listed, the last time I saw a price for the Stan's corvette headers, I think they were 585 bucks. Not too bad compared to some other headers I have seen out there. I want to say that was well over a year ago. (yes, I have been drooling over these things for awhile now.) I think you can give them a call, and they'll quote you a price.
A man can dream, can't he? Yes..... a man can dream........
Keep the shiny side up!
Last edited by scottyp99; Nov 26, 2012 at 11:05 PM.
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Racer
Joined: Nov 2011
Posts: 285
Likes: 36
From: Cedar Park TX
Hooker Super Comp here as well. I do wish I had the ball-socket collector setup, maybe I will cut and weld some on.
I'm going 3" all the way out back, 2.5" system will work fine for your set up. Several companys offer a "header - back" system
enjoy the build!
I'm going 3" all the way out back, 2.5" system will work fine for your set up. Several companys offer a "header - back" system
enjoy the build!
Last edited by BlowAMouse; Nov 27, 2012 at 08:37 AM. Reason: original made no sence
Melting Slicks
Joined: Aug 2012
Posts: 3,487
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From: Titusville Florida
Burning Brakes
Joined: Mar 2011
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From: NJ
For what your describing as important to you. Hedman has what they call an elite header it has thicker then normal head flanges and tubing, ball flanges and thermal coating 68308 should fit your car $325.00 at www.summitracing.com. The elite header uses 3/8 head flange and 14 gauge tubing where most average headers use thinner 5/16 head flange and 16 gauge tubing. They use 1 5/8 primary tubes big enough for 400 hp.
I test fit them and had to remove the starter. 1" bolts will bottom out so I cut 1/4 off the ends.
Spark plugs boots are VERY close....not sure yet if too close. We'll find out soon.
I'll most likely go with the CC 2.5" pipes and havent decided on magnaflow/flowmaster yet.
Racer
Joined: Nov 2011
Posts: 285
Likes: 36
From: Cedar Park TX
http://www.pypesexhaust.com/sys-vette1.html
http://www.magnaflow.com/02product/s...ETTE&year=1973
Racer
Joined: Feb 2012
Posts: 383
Likes: 4
From: Charlotte NC
I'm installing 2.5" exhaust in my '70 this weekend with an x pipe and Dynomax VT mufflers. We'll see how they sound. The mufflers were only $45 a piece shipped from Advance Auto with all the sales they've been having.
Melting Slicks
Joined: Aug 2012
Posts: 3,487
Likes: 83
From: Titusville Florida
I lied, looks like they are "crossmember" back systems. Sorry, it's been awhile since I looked
http://www.pypesexhaust.com/sys-vette1.html
http://www.magnaflow.com/02product/s...ETTE&year=1973
http://www.pypesexhaust.com/sys-vette1.html
http://www.magnaflow.com/02product/s...ETTE&year=1973
Having said that, I did see a 2.5" all the way back for (OE manifold back), for BB, would there be any difference with a SB?
Burning Brakes
Joined: Mar 2011
Posts: 969
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From: NJ
Thanks
Racer
Joined: Feb 2012
Posts: 383
Likes: 4
From: Charlotte NC
I bought the 17519, offset/offset. I also bought a set of the center outs and will use whichever fits. The offset Factory tips and spare tub make for a tight fit. I'll post a thread about them once they're installed.
Racer
Joined: Nov 2011
Posts: 285
Likes: 36
From: Cedar Park TX
No worries, thanks. I've been looking for a 2.5" header back system and thought maybe I missed one which wouldn't be hard with all the aftermarket sites out there. I did see some that are OE manifold back but they are 2.25" to 2.5", which I could have cut and welded onto the collector flange but again they are 2.25" upstream then 2.5" downstream. Where it makes the change I don't know.
Having said that, I did see a 2.5" all the way back for (OE manifold back), for BB, would there be any difference with a SB?
Having said that, I did see a 2.5" all the way back for (OE manifold back), for BB, would there be any difference with a SB?
Good Luck