quote:

If you really want more airflow to the motor, remove the rear quarter windows and install air scoops (elephant ears) from Hall.

On the aspect of elephant ears, side window removal and decklid grills....

Many a time it has been shown the engine compartment is a positive pressure zone;
1. With rear quarter windows removed air exits out of the side windows not in!
2. People have run with the decklid unlatched and (without gas shocks) the lid is reported to sit about an inch or two above closed at high speed, balancing the airflow over it with that escaping the engine bay.
3. Air is drawn up into the engine bay from the underside of the car (seen how dirty it gets in there!) and the stock air cleaner had a hose to draw air from beneath the car.
4. Even the elephant ears are not out of the boudary layer sufficiently to be any use until +150 mph

I have a fiberglass decklid to install on #7024. a) it has NACA ducts on the shoulders (these were already installed but I was looking to do similar anyway). I also considered NACA ducts in the rear of the rocker panels. NACA ducts disturb the boundary layer and create a low pressure zone. b) I will be cutting the decklid with 45 degree chevron pattern (so as not to cut through the structural ribbing) to provide open air flow from the engine compartment.

Julian

My side scoops are feeding an oil cooler but the area underneath is closed off not just by the belly pan but by the oil cooler duct work.

All this mute as the oil cooler has it's own fan. I am thinking the other side to add a fan to run air down between the right side gas tank and headers.

I had my 180's exit out the sides until this summer. Saves from having to fill the old muffler holes but sounds like a VW at idle. Yes, hard to believe, but just the angle of the pipe outwards chages the sound dramatically.
There is no resonance with 180's.
I've owned both Hall and precision Proformance headers. Precisions are better (tighter) and allow for the use of deck shocks. They needed tweaking though. It's always better to have them custom built to your car, but I didn't have this option here in the North, but I also see that as being way more expensive.
Will

Love the Kirk Evans wing, RRS.

How does the 3rd brakelight do? Is your radio antenna in the wing as well? Is the decklid stock?

What do the mufflers do to 180 the sound?

Has anyone ever seen or done a "8 into 1" collector

" Do you have any comments about the effectiveness of the the engine breather system plumbed into the collectors .. Is there some little venturi or something in there that causes it to draw ..No issues with backfires"

" The crankcase evacuation systems reduce crankcase pressure increases piston ring seal, reduced intake charge contamination, and fewer oil leaks. They have been track and dyno-tested to produce significant increases in engine performance."

I personally have used these in a drag race application ... I had to increase the screen in the breathers because it sucked too much oil from the motor .. as you can see the fire arestors screwed on to the nipple at the header to prevent backfire.

Ron

My 180's are a bit different than most. They were custom fabricated on a 351c mockup used for offshore racing boats then the remaining tubing was fabricated to the 180's by a fellow Pantera owner who built dragsters.

Gutting the mufflers coupled with the twin outlets of each give it a real nice sound. The engine was being built when AZ eliminated emissions testing for classic cars so changes were made to make it somewhat of a race engine. Estimate about 550 - 575 hp with a Barry Grant 850 cfm carb.

3rd brakelight is fantastic. Don't use an antenna so it stays down. I run a 10 disc remote CD player or can plug my MP3 into the auxiliary of the radio and use that.

There is a dual nitrous setup which will never be used - for show only.

quote:

Looking at your photo posts. The shots posted on the 17th are the 180's from Precision Proformance and those in post from the 23rd are the Halls, based on what you said about the decklid shocks fitting or not?

Do you have any comments about the effectiveness of the the engine breather system plumbed into the collectors on the Hall (?) system? Is there some little venturi or something in there that causes it to draw? No issues with backfires or anything?

And once again, you say that the 2000 rpm moan disappears? 180's look great, sound great and the cabin moan goes away too? Those Precision Proformance pipe are looking pretty attractive.

I converted from Hall 180's to the Precision 180's and straight out the back. I should have welded on the fittings for the crankcase ventilation but never did. Ron explained the benefits already.
Yes, the 2200 rpm drone is gone and replaced with a quieter, even sound until it reaches 3000, then it starts to scream.
I just had it out an hour ago and my ears are still ringing.
Will