E-body big block headers vs. manifolds
#2341006
07/21/17 03:55 PM
07/21/17 03:55 PM
|
Joined: Jul 2017
Posts: 37 SF Bay Area
cudabill
OP
member
|
OP
member
Joined: Jul 2017
Posts: 37
SF Bay Area
|
I'm repairing the body shell of my '70 Barracuda and adding stiffeners where necessary, which seems a good time to plan for headers and big pipes. Don't want front inner fender bracing to get in the way, and need room underneath for 3" pipes.
I haven't seen many photos of headers on e-bodies. Search does show Doug Thorley headers are the top pick.
Love to replicate the header 'ping-pingping-ping' idle sound from a solid roller cam.
Are headers no making much difference? Too much warping and exhaust leaks? Not enough room?
Current:'70 Barracuda 383 Gran Coupe project, Past highlights: Datsun roadster/Olds V8, Porsche 924/buick V6, '89 IROC-Z, '00 Vette/procharged LS3, ML63, 335i, 914, 944T, '39 LaSalle sedan project
|
|
|
Re: E-body big block headers vs. manifolds
[Re: cudabill]
#2341230
07/21/17 11:09 PM
07/21/17 11:09 PM
|
Joined: Jul 2013
Posts: 1,272 Northern Calyfornua
Sxrxrnr
pro stock
|
pro stock
Joined: Jul 2013
Posts: 1,272
Northern Calyfornua
|
Running 2 inch TTI's with 3 inch exhaust on 70 Challenger, Fit well, tight at stock PS box,,,had to move engine slightly toward passenger side for clearance. Switched to Borgeson box,,,not only for clearance,,,much more room.
Biggest complaint,,,,nice chrome look ceramic coating eventually dulls to gray and sound as leaking, when not. Stock manifolds are much superior in that regard.
Spark plug access though doable is tight at numbers 2, 4, 6 cylinders. Number 6 the toughest. No way to get a compression gauge on any of them that I have found. Have tried a variety of screw ins and plug ins.
|
|
|
Re: E-body big block headers vs. manifolds
[Re: cudabill]
#2341269
07/21/17 11:57 PM
07/21/17 11:57 PM
|
Joined: Jul 2017
Posts: 37 SF Bay Area
cudabill
OP
member
|
OP
member
Joined: Jul 2017
Posts: 37
SF Bay Area
|
Certain cars don't gain much from headers. I wasn't sure if that was the case with Chrysler BB motors. I can't feel any gain under 10%, and the gains I see are may 20-30hp. That being said, I'll rebuild the 383 as a stroker and put heads and cam on it with a 500hp goal. Deep breathing engines should benefit more from headers. I did find a blog on header brands on Moparts: http://www.moparts.org/Tech/Archive/exhaust/17.html
Current:'70 Barracuda 383 Gran Coupe project, Past highlights: Datsun roadster/Olds V8, Porsche 924/buick V6, '89 IROC-Z, '00 Vette/procharged LS3, ML63, 335i, 914, 944T, '39 LaSalle sedan project
|
|
|
Re: E-body big block headers vs. manifolds
[Re: cudabill]
#2341282
07/22/17 12:25 AM
07/22/17 12:25 AM
|
Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Certain cars don't gain much from headers. I wasn't sure if that was the case with Chrysler BB motors. I can't feel any gain under 10%, and the gains I see are may 20-30hp. That being said, I'll rebuild the 383 as a stroker and put heads and cam on it with a 500hp goal. Deep breathing engines should benefit more from headers. I did find a blog on header brands on Moparts: http://www.moparts.org/Tech/Archive/exhaust/17.html You WILL be far better off with headers on it.. MOST of the manifolds are a choke point except a couple of manifolds and they tend to be the race type
|
|
|
Re: E-body big block headers vs. manifolds
[Re: cudabill]
#2341347
07/22/17 06:12 AM
07/22/17 06:12 AM
|
Joined: Jan 2005
Posts: 4,862 the frozen wastes...
Pale_Roader
Swears too much
|
Swears too much
Joined: Jan 2005
Posts: 4,862
the frozen wastes...
|
I'm repairing the body shell of my '70 Barracuda and adding stiffeners where necessary, which seems a good time to plan for headers and big pipes. Don't want front inner fender bracing to get in the way, and need room underneath for 3" pipes.
I haven't seen many photos of headers on e-bodies. Search does show Doug Thorley headers are the top pick.
Love to replicate the header 'ping-pingping-ping' idle sound from a solid roller cam.
Are headers no making much difference? Too much warping and exhaust leaks? Not enough room?
Mopar big blocks LOOOOOOVE long tube headers. Absolutely, without a shred ov question worth any hassles. Just get GOOD ones. (changing plugs on my cheapass Hooker comps w 440? NOT worth the hassle) You get what you pay for. Do not buy an outdated design. Dougs. TTi's. One thing though... what you DONT want... IS that ping-ping sound. That is the sound ov garbage headers. Thin tubes, crappy thin flanges, maybe even poorer steel? Thats the sound ov compromise. Listen to a car with GOOD headers. ALL you hear is the exhaust... coming out the loud end. Thats how it should be. I just shake my head when a guy revs up a big dollar build and i can hear the exhaust right near the engine... Or when the engine compartment is louder than the rear...
|
|
|
Re: E-body big block headers vs. manifolds
[Re: cudabill]
#2341377
07/22/17 09:47 AM
07/22/17 09:47 AM
|
Joined: Feb 2010
Posts: 1,645 Phila. Pa.
Mattax
top fuel
|
top fuel
Joined: Feb 2010
Posts: 1,645
Phila. Pa.
|
Performance will depend on the engine, actual use of the car and how well the header design works with the rest of the package. For example: Too large on primary pipes off the head and there will be little gain at low and mid range (street use). For more on this, search for Calvin Elston's posts on Speedtalk, and/or run your specs through Pipemax. Cheated turns will hurt velocity and potential performance. see http://speedtalk.com/forum/viewtopic.php?f=1&t=36849&p=449613Pipes that get in your way or put heat into the locations that are not so tolerant of heat are drawbacks of a different nature. That said, there are some creative designs you can look into including Shorties (TTI, maybe Sanderson) and Tri-Y (Schumacher). Another consideration is flange sealing. Few mass produced headers have trully flat flanges. Some try to solve the issue with a raided bead around the ports. These require a soft gasket. see http://speedtalk.com/forum/viewtopic.php?f=1&t=48643&p=643888#p643888
|
|
|
|
|