Max wedge vs HP manifolds vs Headers Test!!
- Thread starter 69monaco
- Start date
Rapidtrans777
Well-Known Member
I'll never get tired of listening to a big block mopar making power!
67Monaco
Go Woke, Go Broke.
So what was the outcome?
Newport 66
Old Man with a Hat
The max wedge manifolds are just cool!!
Headers are good for racing, not so much for street use, in my opinion.
The HP manifolds work well enough for most of us and our applications.
Watch the video, for what I thought were surprising results.
Headers are good for racing, not so much for street use, in my opinion.
The HP manifolds work well enough for most of us and our applications.
Watch the video, for what I thought were surprising results.
twostick
Senior Member
I would have like to seen the difference in air fuel ratio at WOT between them.
Kevin
Kevin
Very different results from 2018 between the HP manifolds and headers.
Speculation the cam's long duration used in the new video above is hurting the HP's. Here is the older video with a milder cam.
Speculation the cam's long duration used in the new video above is hurting the HP's. Here is the older video with a milder cam.
That 2nd vid seems more accurate. The orig 3-way comparison didn't produce, to me, really accurate results. The motor sounded happier with the Hooker Headers than with either one of the cast iron manifolds. Just that things were "unknown" as to what was in the motor.
Wondering how much air was being consumed in the 2nd video? With the headers and exhaust manifolds. The headers in the 2nd vid were 2.0" and those in the first vid were 1 7/8". BTAIM
The Max Wedge manifolds would probably make better torque due to their longer runners, I suspect, but didn't fit everywhere the later HP manifolds would.
On the Chevy LT1 (reverse-flow cooling system) 5.7L V-8s, when you get past the two layers of heat shielding covering the exhaust manifolds, you'll find some exhaust manifolds which look like shrunken Chrysler B/RB HP exhaust manifolds. When I saw those for the first time, I grinned and LAUGHED.
Enjoy!
CBODY67
Wondering how much air was being consumed in the 2nd video? With the headers and exhaust manifolds. The headers in the 2nd vid were 2.0" and those in the first vid were 1 7/8". BTAIM
The Max Wedge manifolds would probably make better torque due to their longer runners, I suspect, but didn't fit everywhere the later HP manifolds would.
On the Chevy LT1 (reverse-flow cooling system) 5.7L V-8s, when you get past the two layers of heat shielding covering the exhaust manifolds, you'll find some exhaust manifolds which look like shrunken Chrysler B/RB HP exhaust manifolds. When I saw those for the first time, I grinned and LAUGHED.
Enjoy!
CBODY67
WissaMan
Well-Known Member
- Joined
- Sep 12, 2018
- Messages
- 582
- Reaction score
- 600
I didn't watch the second video yet, but I think that in all cases, if you put a full exhaust on those motors, the max power difference achieved with the various headers/manifolds/etc. will be reduced. So for instance, in the first video the headers provided +74ft-lb peak torque over the HP manifolds. However, if you bottled up the engine with a full exhaust the advantage would be less, maybe only half the gain, who knows?
Maybe engine dyno rooms aren't typically set up so an engine can be coupled to an actual exhaust system, but that'd provide more accurate data imo.
Maybe engine dyno rooms aren't typically set up so an engine can be coupled to an actual exhaust system, but that'd provide more accurate data imo.
LeBaron1973
Old Man with a Hat
- Joined
- Sep 13, 2015
- Messages
- 6,303
- Reaction score
- 2,405
Headers, Max Wedge and HP in that order.
That's a fairly sick 440. Just a tick over 400 horse? Low compression, a big duration cam bleeding off even more pressure. A friend built a zero deck 440 with ported 906's and a fairly mild hydraulic flat tappet cam and it dyno'd at just short of 500 horse.
Last edited:
I read an interview with Doug Thorley years ago, and he said if you put a set of headers and better intake on a late sixties 383-440 HP B body you would gain about 15-20 HP.
He thought the stock HP exhaust was actually pretty good and well matched, and preferred no H pipe, said it basically only affected the exhaust tone/sound and just mellowed it out, and he preferred the non H pipe sound.
Obviously on a hotter car the gains would go up, especially open header drag racing.
mr gtx
Active Member
there was a dyno test HP manifolds vs the log exhaust manifolds there was no difference. why would anyone run the heavy max wedge headers not making as much HP as headers and heating up your engine compartment and master cylinder and everything else. plus the weight pulling your header bolts right out of your heads.
Because the nostalgic look..........piece of history!
mr gtx
Active Member
yea if you had a real max wedge
mr gtx
Active Member
i will try to find it. read about it 3 years ago was on one of the mopar forums
I suspect it was the one heavily discussed here and FBBO. I recall it and was done by a well respected engine builder and contributor to both sites and others.
He really wasn’t primarily testing just the differences in exhaust, but was making many changes to show gains in HP of a low compression motor.
Iraqi52 maybe?
mr gtx
Active Member
i will find it
Similar threads
- Locked
