180 degree header question.

I would think there should be 4 separate holes otherwise it would defeat the purpose of the 180 degree design.

I would want the mufflers supported to prevent metal fatigue due to their movement. Although from your pictures I don't see an easy way to do this.

I've got the exact same headers, although I have not trial fitted them yet. I bought them off someone here who had pulled them from a pantera stash of parts. They are the SVO/Yates exhaust port for a cleveland (9.2 deck). You will need to do a little more digging on your motor to find out if its a windsor 9.2 or aftermarket 9.5 deck block or a cleveland block with yates heads? May explain the need for the block spacer. The spacer could be the result of a 9.5 deck block and yes the open spacer does negate the bundle of snake separated pulses. My understanding is the headers were commissioned and sold by Hall and built by Stan's Headers here in WA State for Hall.

If you don't mind can you produce a video of what your car sounds like and dump it on youtube, I'm interested to get an idea of what I would get with this setup. I'll produce some mock up pictures in a few days. It shouldn't be difficult to draw a template with the 4 holes and have it CNC'd correctly to replace the current spacer. I'll let you know if it lines up correctly on my cleveland block with c302 heads without the spacer.

Hustler, this will give you a comparison. The yellow car at 2:10 has 180's
https://www.youtube.com/watch?v=raL5NQAgCHc

Mine are also the c3 Yates heads on an svo Windsor block, the owner told me it came straight from Yates out of their nascar truck series, said it cost him 40k.
Has the high rise svo manifold 1150 demon carb and the c3 Yates heads
I have a short video of the car idling I'll try to upload it.

thanks 4nhotrod, do you know if that car has those particular headers, the mufflers look more like a glasspack type deal, so curious how those sound as some other 180's have used different style mufflers.

https://youtu.be/fEU6F4y06sE

Here's a vid I took a while back when I was looking at buying the car.

It sat for a month or 2 without being started.
And with no choke it pops when cold.

As you can see it's the same headers you have.
Mine came with glass packs as well as straight pipes.

The car will sound totally different with the mufflers straight back or angled outside to the original openings. I had Hall pipes out to the side and couldn't stand the sound. I now have Byers pipes straight out the back. the yellow car has the byers pipes

Though true for all exhausts, especially on 180s, it is remarkable how placement and even the direction the tail pipes point affect the sound. Tail pipes that point down toward the ground make a noticeable difference in audible noise level (softens) and placing the tail pipes apart in the two OE muffler pockets produces a different sound than a side by side arrangement exiting through the condenser grill. Of course affects are more pronounced standing behind the car or to an observer as you’re passing by and less noticeable for the driver from the cockpit……on the pipes at full song.

IMO, the center exit is definitely the best sound, more closely replicating a flat plane crank V8, but I still have a very difficult time looking at the back of my Pantera without OE appearing Ansa cans tucked in the original positions.

Best,
K

quote:

Originally posted by Ace:
https://youtu.be/fEU6F4y06sE

Here's a vid I took a while back when I was looking at buying the car.

It sat for a month or 2 without being started.
And with no choke it pops when cold.

As you can see it's the same headers you have.
Mine came with glass packs as well as straight pipes.

That is pretty much how they sound at idle from behind.

In the cabin you get an entirely different effect. The noise is behind you and I get little or no vibration from the exhausts.

Of course the effect of the induction into the Weber stacks is noticeable though. They are closer to your ears.


At full throttle the Webers change the effect of the sound of the exhaust because of the power pulses of an IR manifold.

quote:

Originally posted by Ace:
...spacer block between the banks at the rear Of the engine.
...should that block be open to all 4 header tubes? Or
Have 4 holes to keep the tubes separate?
...had one made That is just open in the middle....

I would concur with Husker in that the tubes should have seperration.

However, a more pressing reason for a new spacer would be to trim the sharp outer corners so it would look more approiate.

I agree about the spacer plate, as for the exhaust tip placement, I love the look of the side exit.
But I might have to reconsider the center exit, the condenser was already moved to the front.
But the previous owner cut holes in the rear for the exhaust to exit, and those will remain if I move the tips.

I also have to consider fabbing a support for the mufflers, and it will be easier
With them exiting the rear. Oh what to do what to do. Lol

With regard to the rear center exit, how do people deal with the grill? Is there an
After market grill with cut outs in it? Or do you just cut the OE grill?

I still have the mufflers in storage. I changed them out to Thrush polished stainless mufflers because I wanted a finished tip showing in the back.

I like the side exit also.

I had the headers powder coated and they still look new.

The GT40's just ran a "screen door" spring over the mufflers and bolted that to the chassis.

The spring gives flexability, doesn't transmit vibration and reduces the muffler vibrations.

Seems to work well enough.

My son fell on the ground laughing at them. Asked, "where did you come up with that idea from, Rube Goldberg?"

Then I showed him the pictures of the '40s. He stopped laughing. Out loud anyway.

I don't think Ferrari still laughs about them? They are in the back of the car, and he could get a really good look at them there?

Through grille.

Tony Ortiz (Black Panther) has some cool little custom shock absorbers that suspend his 180s.

It looks like a nice setup.

Rocky

RRS, Neat setup. You're teasing us! What does it look like on the inside?

This is Ron McCalls handiwork on mine.

Inside

Mufflers are completely gutted, no internals.