[Elarson]

Looking for headers that tuck up tight inside the frame rails. My new road racer project car is going to sit pretty low. What's everybody's experience?
I'm not sure what's on the car I bought but the left side tucks up and the right side hangs down way too much.

600-700 hp?
3" collectors to mate to 3" exhaust pipes.

Eric

[Steve C.]

This might be of interest:

https://www.hotrod.com/articles/head...s-performance/

I recently changed cams to reduce intensity and spring pressure. However prior to the change my 505 made 660 hp at 6000 rpm. It uses Edelbrock round port heads. We bought Headman 2-inch primary headers with 3.5-inch collectors and modified them so they tuck up to improve ground clearance. From the collectors I use a universal X-pipe kit from Dr.Gas, it is now the lowest point in the exhaust system, which is 3-inch including the tail pipes. My mufflers are Dynomax Ultraflow Welded with a 14-inch shell/ offset-3" in & 3" out. Currently the car is street only.

.

[Elarson]

How much modification was required to tuck them up?

Eric

[Steve C.]

PM sent.


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[PAUL K]

Doug's 1 7/8 offer the most ground clearance I've seen other than tri-y headers. They are for round port but do have a 3.5" collector. They seemed good on the 750 HP engine we dyno'd compared to the Hooker 2"..... For a second generation Firebird.

[ErikW]

2nd vote for Doug's. Have a set of 2", I think, on my wife's 71 TA. They could be 1 7/8 I'll have to double-check. Fit great. However, like stated above they are 3.5" collectors. Easy to adapt to 3".

[ErikW]

Found this pic of my wife's 71. We cut off the collector flanges and welded on v-bands.

[Elarson]

Originally Posted by ErikW

Found this pic of my wife's 71. We cut off the collector flanges and welded on v-bands.

Excellent info and picture. Wow that car is clean underneath.

Thanks,
Eric

[ta man]

I like the V band of instead of the collector flanges..I'm going to do the same..No more screwing with ticking collector gaskets. Especially with the 02 sensors being close. Any reasoning for the flex pipe section? Better fit?

[Steve C.]

Similar situation here, removed the collector flange and used a double wall heavy duty flat band clamp.


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[ErikW]

Originally Posted by ta man

I like the V band of instead of the collector flanges..I'm going to do the same..No more screwing with ticking collector gaskets. Especially with the 02 sensors being close. Any reasoning for the flex pipe section? Better fit?

Better fit and less vibration.

[Tom Vaught]

I have run Marmon Flanges and V-Band Clamps for many years.
The Le Mans cars used them too in 2016.

BE AWARE THAT SOME OF THE V-BAND CLAMPS HAVE A PIVOT PIN THAT IS WEAK AND WITH LONG TERM POWER (LE MANS) IT WILL FAIL. We fought that deal for a few months and finally figured out the issue and fix prior to the 2016 Le Mans win.

For street use it might not ever be a problem. The Band and Bolt clamp stuff seems to be pretty durable but takes a bit more time to remove.

Tom V.

[ta man]

Originally Posted by Tom Vaught

I have run Marmon Flanges and V-Band Clamps for many years.
The Le Mans cars used them too in 2016.

BE AWARE THAT SOME OF THE V-BAND CLAMPS HAVE A PIVOT PIN THAT IS WEAK AND WITH LONG TERM POWER (LE MANS) IT WILL FAIL. We fought that deal for a few months and finally figured out the issue and fix prior to the 2016 Le Mans win.

For street use it might not ever be a problem. The Band and Bolt clamp stuff seems to be pretty durable but takes a bit more time to remove.

Tom V.

Thanks Tom..even if they aren't engineered for Le Mans..they will meet my needs!

[Elarson]

Originally Posted by Tom Vaught

I have run Marmon Flanges and V-Band Clamps for many years.
The Le Mans cars used them too in 2016.

BE AWARE THAT SOME OF THE V-BAND CLAMPS HAVE A PIVOT PIN THAT IS WEAK AND WITH LONG TERM POWER (LE MANS) IT WILL FAIL. We fought that deal for a few months and finally figured out the issue and fix prior to the 2016 Le Mans win.

For street use it might not ever be a problem. The Band and Bolt clamp stuff seems to be pretty durable but takes a bit more time to remove.

Tom V.

Aircraft engines use a high-dollar version of those quite successfully in a "failure is not an option" mode.

Eric

[Skip Fix]

I autocrossed my 78 with really short road race tires and the Hookers 2"/3.5" did fine.But may be a hair lower than those Doug's. I think the RA manifolds and down pipes on the 81 are lower!

[Skip Fix]

Forgot I had some of the IA/Camaro and the Hookers. It does have 3.;5 head pipes.

[grandville455]

Originally Posted by Steve C.

This might be of interest:

https://www.hotrod.com/articles/head...s-performance/

I recently changed cams to reduce intensity and spring pressure. However prior to the change my 505 made 660 hp at 6000 rpm. It uses Edelbrock round port heads. We bought Headman 2-inch primary headers with 3.5-inch collectors and modified them so they tuck up to improve ground clearance. From the collectors I use a universal X-pipe kit from Dr.Gas, it is now the lowest point in the exhaust system, which is 3-inch including the tail pipes. My mufflers are Dynomax Ultraflow Welded with a 14-inch shell/ offset-3" in & 3" out. Currently the car is street only.

.

Steve I would like to see pics how u did that also
thanks

[Steve C.]

Darby, I sent a picture to you via your email. Also provided a picture to Eric.

Sorry I don't know how to post pictures here. When you get the picture please post it for me, maybe others would like to see it. John did the work at his shop.
He removed the collector flange. He prefers to use a double wall heavy duty flat band clamp.

Also note on the chart previously posted it notes inside tube diameter.

https://www.hotrod.com/uploads/sites...ound%7C875:492

Similar situation with some computer simulation programs. Example the Performance Trends Engine Analyzer v3.2 calls for the inside tube diameter on the headers.



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[Elarson]

Originally Posted by Skip Fix

Forgot I had some of the IA/Camaro and the Hookers. It does have 3.;5 head pipes.

Excellent pix, Thanks!

Eric

[Skip Fix]

Eric the only thing different on the TA system is 3" X and flanges at the mufflers too to drop the whole X. Muffler guy was supposed to when he id it but forgot and with al;l; the convertor swaps this year I cuss him every time! The PYPES 3.5 X I had to swap the "rear" legs to the front to make the width of headers.

You can see the bracket I made for the driveshaft rpm sensor too!