Re: Header upgrade
[Re: fbs63]
#2435537
01/16/18 12:04 PM
01/16/18 12:04 PM
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Joined: Jan 2003
Posts: 4,048 Shelby Twp. Mi
HardcoreB
master
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master
Joined: Jan 2003
Posts: 4,048
Shelby Twp. Mi
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Run the combo thru Pipemax,follow the recommendation and build a set. That's the best way. I agree with Bob. The B-bodies have decent engine compartment room to allow for bigger tubes and smooth transitions. If you are having some built organize them in the collector respective of firing order. Also, consider if you will upgrade power-wise or any other significant powertrain changes (e.g.- tire size, trans gearing etc.) and bias the new headers based on that. A set done well can cover a decent variation in power without compromising much performance. The other major advantages is when done well, plug access and removal/install can be made easy...I know in the past for me, I would be willing to have opted to spend the extra time/money to avoid the aggravations. Multiply the 'aggravations' by each time you need to do something and they quickly 'pay' for themselves.
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Re: Header upgrade
[Re: montessa]
#2435593
01/16/18 01:19 PM
01/16/18 01:19 PM
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Joined: Jan 2003
Posts: 14,496 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,496
So. Burlington, Vt.
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My .02......
If the bigger tubes cost the car anything in the 60'(footbrake combo), you'll never make it up down track.
There is no way to know how the car will respond to bigger headers than to try them.
Fwiw....... A lot of $$$ was spent on bigger carbs and bigger cam.... Which basically did nothing to improve the ET.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Header upgrade
[Re: fast68plymouth]
#2435596
01/16/18 01:24 PM
01/16/18 01:24 PM
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Joined: Jan 2003
Posts: 13,362 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,362
Marion, South Carolina [><]
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My .02......
If the bigger tubes cost the car anything in the 60'(footbrake combo), you'll never make it up down track.
There is no way to know how the car will respond to bigger headers than to try them.
Fwiw....... A lot of $$$ was spent on bigger carbs and bigger cam.... Which basically did nothing to improve the ET. I found the same thing w/ a bigger intake manifold on my 572. The 60' suffered so much that the extra topend power never was a benefit as far as ET goes.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Header upgrade
[Re: fast68plymouth]
#2435698
01/16/18 03:33 PM
01/16/18 03:33 PM
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Joined: Jan 2003
Posts: 4,048 Shelby Twp. Mi
HardcoreB
master
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master
Joined: Jan 2003
Posts: 4,048
Shelby Twp. Mi
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My .02......
If the bigger tubes cost the car anything in the 60'(footbrake combo), you'll never make it up down track.
There is no way to know how the car will respond to bigger headers than to try them.
Fwiw....... A lot of $$$ was spent on bigger carbs and bigger cam.... Which basically did nothing to improve the ET. Well I remember a good bit about your car combo and last time I saw you (years ago) you had switched to 4500's and saw no improvement. More importantly I know you will consider the recommendations given here but weigh more on the one given by Dwayne (and you'd be right) so, for this reason I did not give my additional 2 cents. But because they seem to be in-line with what Dwayne posted I will second the general recommendation to error on the smaller side. I'll even go one step further and say I think a shorter (32-34") 2 1/8 into a 4 (4 into 1...don't get fancy) with as gradual bends as possible will work well. However, it might be a good opportunity to try another cam however based on what you now know. If your intake doesn't have a plenum spacer that too may pick you up. ...what was the original question again? lol
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Re: Header upgrade
[Re: montessa]
#2436005
01/16/18 11:32 PM
01/16/18 11:32 PM
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Joined: Jan 2003
Posts: 4,048 Shelby Twp. Mi
HardcoreB
master
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master
Joined: Jan 2003
Posts: 4,048
Shelby Twp. Mi
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Thanks guys, good feed back! I have to agree with all of your experiences. Right out of the box the old combo was stronger. The 60ft and 1/8 mile was quicker with the smaller cam and carbs. The mph picked up by 1 mph but the ET was down by half a tenth when I switched to the bigger stuff. Also killed the 2 foot wheelies! I am seriously considering going back to a good set of 4150 carbs to pick up the bottom end. I am afraid because to car ran so well with the smaller stuff on the first setup I got carried away with the bigger is better thing and went backwards instead. I believe because my car is heavy, that it is more important to get as much as you can out of the hole. The new setup may be making a little more horse power, however any gains that you made at the top were lost on the bottom. I would have to believe that the same would be true with the larger tube headers. I'd be willing to loan you a set of 4150HP's to try. Give me a call and maybe we can figure something out.
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Re: Header upgrade
[Re: montessa]
#2436632
01/17/18 11:51 PM
01/17/18 11:51 PM
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Joined: Oct 2011
Posts: 326 Alberta
Wookie316
enthusiast
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enthusiast
Joined: Oct 2011
Posts: 326
Alberta
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The never ending search for just a bit more. This is interesting. My car last year was just over 4100 with me in it at just under 840 HP. My Sig line shows my best so far. I made a couple of changes over the winter that I hope don’t put me backwards. One improvement is I should be under 4000 maybe even close to 3900. I’ve taken just under a 100 off and I think I can find another 100 to come off fairly easy without starting to look strictly race. It will be interesting to see if I improved or not?
I run the same step header as you on an EZ-1.
Sometimes I think the rules for us heavy weights are a bit different then the lighter cars. I run the low gear set in my 727. Not sure if that is good or a handicap? Great looking car with impressive numbers. That is one to be proud of.
Last edited by Wookie316; 01/17/18 11:52 PM.
1971 Plum Crazy Super Bee. 572 World Aluminum block with a Cope 727 & Dana 4.10 out back. 9.88 @ 138 with a 1.35 60 NA. Dialed back to 10.0’s. 4000 lbs with me in it.
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Re: Header upgrade
[Re: montessa]
#2436642
01/18/18 12:17 AM
01/18/18 12:17 AM
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Joined: Jan 2003
Posts: 14,496 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,496
So. Burlington, Vt.
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A quick fuel “850” has a 1.400 x 1.750 main body. That’s probably a good choice.
As long as the metering was set up properly, I’d expect them to run pretty well.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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