I like how the pipes are not stacked on top of each other at the collector. Makes for more ground clearance. Sorta reminds me of the 351C Pinto headers Hedman made years ago.
Has anyone seen these before.
- Thread starter Crossrammed340
- Start date
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Like these.
It means.... the longer the tube the more torque it makes. The shorter the tube, the more HP it makes. This is a general thing that has its limits. You can go to far and get a zero or negative result.
famous bob
mopar misfit
If I remember right , the tri -y `s were advertised as a torque header back in the day.
yellow rose
Overnight Sensation
That’s what I also heard. As well as better fitting. It’s design makes sense for more torque and seeing dyno tests, and not many of them directly comparing....
The HP lose wasn’t that much to a small noticeable amount, build dependent.... but then again, the builds purpose is what? Doing what? Where? On the street? Or track?
The HP lose wasn’t that much to a small noticeable amount, build dependent.... but then again, the builds purpose is what? Doing what? Where? On the street? Or track?
gzig5
Well-Known Member
Would you mind sharing the length and diameters of the primary, secondary, and final collector sections?
abdywgn
dismantler
Yes! Please?
Crossrammed340
Basin street Blue survivor
Where do i take them to get scanned ?. ill have to unwrap them to measure them.
gregcon
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They're cool as they're vintage but otherwise, its hard to get excited about a bent tube header. I also gotta think the four pipes laid in a flat row would really hog the space around the trans. Might be nearly impossible to reach the trans linkage, for instance.
Crossrammed340
Basin street Blue survivor
They have been in a 72 340 4-spd Demon to make sure they fit and clear and they do. Car had mini starter and manual steering box.
Dave_J
Well-Known Member
In the "Kit Car" days if you were running the 1/4 mile ovals you'd want the 'Tri-Y' for the lower RPM torque band. You did not have time to shift gears so a wide torque band was what was needed.
But the 1 mile+ ovals the higher RPM's let the horsepower of the standard 'Step' headers work. You shifted gears so you were at high RPM most of the time.
I had a set of the stepped tube 340 'Kit Car' flat 4 into 1 collectors like those 351C Pinto shaped ones above for a long time but they did not fit 1965 Dart GT 4 speed so I off loaded them CHEAP. I got a set of "WORTHLESS" 340 A body Iron logs in a trade when everyone was tossing those in the trash.
Those Kit Car headers were so much overkill for my 273 but back in 1975 we did not know. I think the main tube started at 1 7/8 inch. The Tri-Y would have been much better on a 273-318.
But the 1 mile+ ovals the higher RPM's let the horsepower of the standard 'Step' headers work. You shifted gears so you were at high RPM most of the time.
I had a set of the stepped tube 340 'Kit Car' flat 4 into 1 collectors like those 351C Pinto shaped ones above for a long time but they did not fit 1965 Dart GT 4 speed so I off loaded them CHEAP. I got a set of "WORTHLESS" 340 A body Iron logs in a trade when everyone was tossing those in the trash.
Those Kit Car headers were so much overkill for my 273 but back in 1975 we did not know. I think the main tube started at 1 7/8 inch. The Tri-Y would have been much better on a 273-318.
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