Help with two exhaust routes
Thread Starter
Racer
Joined: Sep 2010
Posts: 259
Likes: 1
From: Mt Airy, NC
Help with two exhaust routes
I'm trying to figure out how to run my exhaust to my 69(style) side exhaust covers. Engine is 383 solid roller with right at 500hp & torque. The choice I'm trying to make is between two headers. The first set is hedman with 1 5/8" primaries 3" collectors, turn directly to side to go down side pipe covers. The second set I'm considering is Hooker Super Comp's (tuned) with 1 3/4" primaries 3" collectors. With the Hookers I will then have to make a U-turn from the collector to go back up to route down the side pipe covers. Both options will have 3" the rest of the way. I guess my dilemma is how much am I giving up with the 1 5/8" (non-tuned) primaries v/s having to make 2 u-turns after the collectors with the Hookers. I hope this makes sense. Thanks for any insight you might have.
Le Mans Master
Joined: Feb 2011
Posts: 5,943
Likes: 61
From: Southern NH
Stahl sells some that go all the way to 2'' primaries.
http://www.stahlheaders.com/Frame%20New%20Drag.htm
http://www.stahlheaders.com/Frame%20New%20Drag.htm
Last edited by qwank; Feb 15, 2014 at 07:36 PM.
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
Don't use two 180 degree bends to run conventional headers, people will laugh when they look under your car. Use headers designed to mate up with the side pipes. Way cooler looking, and I think the extra bends will negate any gains from the Hookers, anyway.
Scott
Scott
Instructor
Joined: Dec 2013
Posts: 158
Likes: 0
From: Maui Hawaii
Another header source suitable for side exhaust: http://www.vetteheaders.com/servlet/...orvette/Detail
Might call and ask if they can make them in the primary size that you want. I wouldn't go larger than 1-7/8" in order to preserve your low end torque and still breathe great on the high end. My choice for a 383 would be 1-3/4" which is ideal even for SBs up to 427CI.
Might call and ask if they can make them in the primary size that you want. I wouldn't go larger than 1-7/8" in order to preserve your low end torque and still breathe great on the high end. My choice for a 383 would be 1-3/4" which is ideal even for SBs up to 427CI.
Last edited by 82CFI; Feb 15, 2014 at 11:51 PM.
Le Mans Master
Joined: Feb 2011
Posts: 5,943
Likes: 61
From: Southern NH
Another header source suitable for side exhaust:
http://www.vetteheaders.com/servlet/...orvette/Detail
http://www.vetteheaders.com/servlet/...orvette/Detail
Instructor
Joined: Dec 2013
Posts: 158
Likes: 0
From: Maui Hawaii
Also, I agree with Scott that you wouldn't want to do the 2 u-turns using a conventional straight back header for the reasons that he mentioned. I've had thoughts about using a straight back header, cutting a hole in side of the collector to mate (weld in) my side pipes and capping the collector end with either a flat plate or one of those electrically operated gates. When performance was needed (at the track), you can just uncap the header but of course on the street there will be the penalty when the exhaust gases make the right angle turn to go to the side exhausts.
Last edited by 82CFI; Feb 16, 2014 at 12:14 AM.
Instructor
Joined: Dec 2013
Posts: 158
Likes: 0
From: Maui Hawaii
Sweet-Thunder, another side exhaust source with many options: http://www.sweet-thunder.com/corvett...pes_68_74.html
They recommend contacting McJacks if you desire custom built headers that fit your side exhaust choice: http://www.mcjackscorvettes.com/headerspage.htm
Good luck with your side exhaust project.
They recommend contacting McJacks if you desire custom built headers that fit your side exhaust choice: http://www.mcjackscorvettes.com/headerspage.htm
Good luck with your side exhaust project.
Drifting
Joined: May 2005
Posts: 1,968
Likes: 44
From: East TN
I'm trying to figure out how to run my exhaust to my 69(style) side exhaust covers. Engine is 383 solid roller with right at 500hp & torque. The choice I'm trying to make is between two headers. The first set is hedman with 1 5/8" primaries 3" collectors, turn directly to side to go down side pipe covers. The second set I'm considering is Hooker Super Comp's (tuned) with 1 3/4" primaries 3" collectors. With the Hookers I will then have to make a U-turn from the collector to go back up to route down the side pipe covers. Both options will have 3" the rest of the way. I guess my dilemma is how much am I giving up with the 1 5/8" (non-tuned) primaries v/s having to make 2 u-turns after the collectors with the Hookers. I hope this makes sense. Thanks for any insight you might have.
Have you come up with anything yet?
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