2" primaries too big? Interesting headers inside
#1
2" primaries too big? Interesting headers inside
An offshoot from my motor swap thread, found here.
The short story is I should be making 500+ hp (that's just a little plus)
383 stroker
AFR 195 heads
A buddy of mine got these headers thrown in with an '87 drag bird he just bought, and I can get them for next to nothing since he's running a BB.
They are Hedman Hustler Hedders. PN 65180. I would be cutting off the dumps or otherwise connecting it to a full exhaust, maybe via cutouts.
They look sweet, but how will they perform? Are they too big for my little 383?
As I heard it, they were run on the bird with a ~700-750 hp smallblock, the numberboard in the window still says "9.17"
The short story is I should be making 500+ hp (that's just a little plus)
383 stroker
AFR 195 heads
A buddy of mine got these headers thrown in with an '87 drag bird he just bought, and I can get them for next to nothing since he's running a BB.
They are Hedman Hustler Hedders. PN 65180. I would be cutting off the dumps or otherwise connecting it to a full exhaust, maybe via cutouts.
They look sweet, but how will they perform? Are they too big for my little 383?
As I heard it, they were run on the bird with a ~700-750 hp smallblock, the numberboard in the window still says "9.17"
#3
Re: 2" primaries too big? Interesting headers inside
What do you make of this thread?
http://www.camaro5.com/forums/showthread.php?t=63640
Those dyno curves are close enough that it wouldn't be worth me dishing out the extra coin to get my 1 3/4" Primary headers, I haven't gotten a price on these ones yet, but it will likely be much less than the 600 I was gonna end up spending.
http://www.camaro5.com/forums/showthread.php?t=63640
Those dyno curves are close enough that it wouldn't be worth me dishing out the extra coin to get my 1 3/4" Primary headers, I haven't gotten a price on these ones yet, but it will likely be much less than the 600 I was gonna end up spending.
#5
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Re: 2" primaries too big? Interesting headers inside
Unless its a race car I'm thinkin those primaries are gonna be too big. Hell, most bolt on LSxs only use 1 3/4" primaries, and modded LSx's use 1 7/8".... Someone correct me if I'm wrong, but your only gonna be able to really fill those things at high RPM.
#6
Re: 2" primaries too big? Interesting headers inside
The test in the link I posted above was on a totally stock LT1.
Every header option gained a little power over the smaller sized option. It really seems like ANY of the 3 sizes would be a good option for my car, and while I will not be turning high enough revs to get into the tuned range of these hedmans, it seems I wouldn't see any LOSS throughout my power and torque curves, if I do see a couple hp gain.
I guess at this point, my decision will be based on how much more expensive it would be to buy the 1 7/8" headers.
Or can someone explain why my results would be different from the ones in that test?
Every header option gained a little power over the smaller sized option. It really seems like ANY of the 3 sizes would be a good option for my car, and while I will not be turning high enough revs to get into the tuned range of these hedmans, it seems I wouldn't see any LOSS throughout my power and torque curves, if I do see a couple hp gain.
I guess at this point, my decision will be based on how much more expensive it would be to buy the 1 7/8" headers.
Or can someone explain why my results would be different from the ones in that test?
#7
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Re: 2" primaries too big? Interesting headers inside
those headers have the stahl bolt pattern too, so unless your heads have them, you can even use them with adapters, and they wont fit the car with the adapters im sure.
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#9
Re: 2" primaries too big? Interesting headers inside
Well the price is $450 for them, too much for an iffy fit/finish/performance header. I think I'm gonna go with a set of 1 3/4" from Doug's headers for an extra $150. Fit should be good and I won't have to use adapters, finish will be shiny and not dented or scratched, and they will be better turned for my rpm range.
#20
Re: 2" primaries too big? Interesting headers inside
If you can't get those biggies to work, these would work well:
http://m.summitracing.com/parts/HOK-2210-1HKR
Kooks wants to charge me $2700 for a set of their custom headers, plus my car needs to be there for them to do it.....yeah, I'm going with the Hookers or Hedmans.
http://m.summitracing.com/parts/HOK-2210-1HKR
Kooks wants to charge me $2700 for a set of their custom headers, plus my car needs to be there for them to do it.....yeah, I'm going with the Hookers or Hedmans.
Last edited by New2Chevy; 04-24-2011 at 09:20 AM.
#24
Re: 2" primaries too big? Interesting headers inside
exactly what the name says, crankcase evacuation. The tube welded at a 45deg angle pulls a slight vacuum so you don't have to run PCV and contaminate the intake. The valves are regular reed valves, exactly the same as used on the emissions air tubes they keep exhaust from backing up through the pipe into the crankcase
#26
Re: 2" primaries too big? Interesting headers inside
Get a gasket that matches the headers in size, no need to use a smaller gasket. In fact it might promote pitting from moisture being trapped behind it. Notice on old heads how the pitting usually is present at the gasket surface.
#28
Re: 2" primaries too big? Interesting headers inside
The adapters adapt a stock head to the stahl pattern so you can bolt these headers on. Check the bolt pattern on the flange, 7 bolts instead of 6, diagonal and V arrangement instead of all inline. This was done so you can run a lot bigger primary without the bolt limiting size.
#30
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Re: 2" primaries too big? Interesting headers inside
1 5/8" would be fine for A 500 HP 383. Better low end torque than 1 3/4". I definetly would not go over 1 3/4" for a 500 hp 383.
#31
Re: 2" primaries too big? Interesting headers inside
From what I've seen:
There is no loss in performance from using larger headers within practical limits. If anything, there will be a slight GAIN throughout the midrange and high RPM. That's my theory, I encourage anyone to contest it, but please provide personal experience or dyno sheets or some other proof to back it up.
I'd like to see some dyno results showing a loss of power or torque anywhere in the RPM range from using a larger primary header.
#32
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Re: 2" primaries too big? Interesting headers inside
Well, I've pretty much decided on going with the Heddman Hustler 1 3/4" headers, but lets keep this going. There seems to be a lot of myths surrounding header choice.
From what I've seen:
There is no loss in performance from using larger headers within practical limits. If anything, there will be a slight GAIN throughout the midrange and high RPM. That's my theory, I encourage anyone to contest it, but please provide personal experience or dyno sheets or some other proof to back it up.
I'd like to see some dyno results showing a loss of power or torque anywhere in the RPM range from using a larger primary header.
From what I've seen:
There is no loss in performance from using larger headers within practical limits. If anything, there will be a slight GAIN throughout the midrange and high RPM. That's my theory, I encourage anyone to contest it, but please provide personal experience or dyno sheets or some other proof to back it up.
I'd like to see some dyno results showing a loss of power or torque anywhere in the RPM range from using a larger primary header.
#33
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Car: 77 Firebird
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Re: 2" primaries too big? Interesting headers inside
1 5/8 shorty headers on the other hand made my 383 sound like an old truck motor, and killed performance all around. So bad I never bothered to take it to the track.
#34
Re: 2" primaries too big? Interesting headers inside
Well, I've pretty much decided on going with the Heddman Hustler 1 3/4" headers, but lets keep this going. There seems to be a lot of myths surrounding header choice.
From what I've seen:
There is no loss in performance from using larger headers within practical limits. If anything, there will be a slight GAIN throughout the midrange and high RPM. That's my theory, I encourage anyone to contest it, but please provide personal experience or dyno sheets or some other proof to back it up.
I'd like to see some dyno results showing a loss of power or torque anywhere in the RPM range from using a larger primary header.
From what I've seen:
There is no loss in performance from using larger headers within practical limits. If anything, there will be a slight GAIN throughout the midrange and high RPM. That's my theory, I encourage anyone to contest it, but please provide personal experience or dyno sheets or some other proof to back it up.
I'd like to see some dyno results showing a loss of power or torque anywhere in the RPM range from using a larger primary header.
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