Melony sounds like one hell of a woman, just like you're one hell of a story teller..:LOL:. It takes a whole lot of "The Right Stuff" to survive, persevere and come up on top like she did..

As far as acupuncture, I don't think they make needles long enough to strike a nerve with me.:rolleyes: ...too thick skinned:p

Now folks, back to our "exhaust"ed discussion...
If it's the original J pipes then they are most likely less than 2". You'll need to get the new ones made before you proceed with the rest of the sidepipes/merge collector build. I think I remember Brian making a post on LS forum saying LS wasn't doing any more custom exhaust work. I called and pleaded for mine as you'll need to do if you have any expectation of him making you a set. If you make a post on LS forum asking him he'll probably reply no. I think they were around $250 or so for the pair. I'm sure they can be built elsewhere, probably by one of our Club Cobra forum vendors/manufacturers.

here's where I am otherwise..
I've got everything completed on the car, save the sidepipe install. The new 31 spline Dutchman alloy axle/Detroit rearend/brakes are all together and actually turn as they're supposed to. I put Stage 8 locking header bolts all the way around. Every nut and bolt on the car has had a wrench tighten it. Tranny fluid's been checked. I changed to ends on the adjustable upper control arms from a 10 degree off-set to neutral. It'll be all ready to go for next season, save a wheel alignment and polishing the Boyds..

Dave

I measured my exhaust.

Headers 1-7/8" or 2"
J-Tubes- 1-3/4"
Collector's- 3"
Muffler housing- 4"
Turn outs- 3"


Do you think of the results ?
Headers and J-tubes too small ?

Kev

FF2,
Are those inside diameters or outside? I'm trying to follow along here as this project interests me. Thanks.

John

All outside. I would really have to make new headers. $$$
But, if it would help out a great deal, I'll suck it up.

Header's- are 2" but, look at the attached photo's. Who ever made these, they squeezed the side's inward, like they put them in a vise ? Was this done for bolt clearance ?

How big of a issue is this ?

J-tubes are 1-3/4"
Collectors are 3"
Muffler housing are 4"
Turn outs are 3"

Are the J-tubes also too small and restrictive ?

Man, it looks like I'll have to spend even more, on new headers, flange,
J-tubes, collectors, mufflers, housing, turn outs,....... the entire exhaust system, before Keiths 482. :eek:

It is common practice to reshape the tube to fit the port----the trick is to have a hole that is equal to the tube size--ie- perimeter of the hole equal to od circumferance of the tube

Ah,....ok. Thank you. If this does not hurt the flow, then no problem I'm sure but, I'll have to talk with Keith about this.

the Ford has a retangular port and the tubes will be resized to fit the header flange.

I am working on specing out 2 sets of stainless headers and the port shape/size to tube size is the big item in the header flanges details.

Funfer, most collectors are 3.5" OD, so are the exit spouts. I've only built mufflers for one customer that had 3" on both of these. FYI.

-Eric

Hello Eric,
Since my header primaries are 2", and the J-tubes are only 1.75", I believe I'll make my new J-tubes 2" also.

What company would you recommend buying 3.5" collectors from ?
I assume your mufflers are 3" ? What brand do you like. I'm looking into the 3"
"Cobra Pack" from "Classic Chambered Exhaust". I'll have to decide with or with out packing. I do like to hear the engine,..... a lot. ;)

Below, he mentions butt welding the ends so it's a clean look. I'll do that also.

"3.5" OD to 3" ID Reducer. Trim both ends to fit. Cut at the transition area to fit just inside 3.5" OD collectors, butt-weld the 3" ID end to the muffler inlet. The goal is to smoothly "funnel" exhaust into the COBRAPACK Muffler"

It all depends on the type of collector you are referring to. A "sweged" collector made from a piece of tubing will be at least 3.5", sometimes as large as 4". This isn't because that is the best flow, it's because you have to start with a big diameter in order to stretch it out to fit 4 x 2" primaries. You will actually find that there are more collectors on the market with outlets that are too large rather than too small.

On a normally aspirated motor we have found a 2" primary flows best with a 3.00" collector outlet and then a 3.50" trasition cone to promote scavenging. When space was an issue we found that it performs better without the transition, staying at 3" than increasing collector outlet to 3.50" immediately. With a turbo or supercharger, then yes, a 3.50" outlet is often called for. With the side pipes we have used a larger collector and skipped the cone if the customer prefers that look.

Kevin, I make the Cobrapacks. I'll PM you (I shouldn't talk about my products on here).