1972 BB exhaust system - judging deduction

[Don L.]

Re: 1972 BB exhaust system - judging deduction

Hi Don,
It looks to me like at least 1/2 of the tab's shape and size is determined by the size and shape of the slot in the tip itself. The cut in the tip is rather carefully drawn compared to some details in the AIM. That info could well help you know what PART of the tab needs to look like.
Can you post a picture of the cut in your (Richard's) tips? Is it more than just a slot? It looks like it's more refined than just a slot in the AIM.
Regards,
Alan

Will do on posting a pic Alan. When looking at the notch in the exhaust tip, it's easy to see what the key will look like in the engaging area. It's the non-engaging, back (actually the front when in-car position) part of the key that I need help with. I'll snap a pic of my chrome tip (installed) this afternoon and post later.

[Patrick H.]

Re: 1972 BB exhaust system - judging deduction

OH NO. If we get to do Milford again I will be in the 2008. I know the limits of those 40 year old tires on the 1970. We had way too much fun last time.

Edit add: By the 2011 Nationals those tires will be 50. They are strictly display only.

You gonna use the 08 to pull the 70 on a trailer?



Not sure how I'd get both cars to Novi.

And, I think your tires will be 41 years old, not 50.

[Don L.]

Re: 1972 BB exhaust system - judging deduction

Attached photos as requested/promised. I admit that the photos are not the best due to the location of the notch when installed to the pipe. The notch is at 12 o'clock, or TDC vs the pipe. I blindly reached the camera up above the pipe/tip and snapped the photos. For reference, the photos are of the LH tip. The clamps are installed facing the center of the car (nuts are inboard.) Especially in the second photo, you can see that the notch is trapazoidal in shape. Sorry they're not better. In addition to these photos, you can kinda see them in Richard Fortier's Driveline ad. See page 49 of the recent/current issue.

If you (or someone else) need(s) a better photo, let me know and I'll remove a tip and take a photo with a scale next to it.

[Terry M.]

Re: 1972 BB exhaust system - judging deduction

You gonna use the 08 to pull the 70 on a trailer?



Not sure how I'd get both cars to Novi.

And, I think your tires will be 41 years old, not 50.

Your math is better than mine, but you were not on your way to the airport when posting I assUme.

Getting both cars to Novi will also be one of my issues, especially given my desire to participate in the Road Tour which could mean taking a week to get to Novi. The things we do and call them fun.

[Terry M.]

Re: 1972 BB exhaust system - judging deduction

Attached photos as requested/promised. I admit that the photos are not the best due to the location of the notch when installed to the pipe. The notch is at 12 o'clock, or TDC vs the pipe. I blindly reached the camera up above the pipe/tip and snapped the photos. For reference, the photos are of the LH tip. The clamps are installed facing the center of the car (nuts are inboard.) Especially in the second photo, you can see that the notch is trapazoidal in shape. Sorry they're not better. In addition to these photos, you can kinda see them in Richard Fortier's Driveline ad. See page 49 of the recent/current issue.

If you (or someone else) need(s) a better photo, let me know and I'll remove a tip and take a photo with a scale next to it.

[Paul O.]

Re: 1972 BB exhaust system - judging deduction

Here are some photos of the alignment cutout on the exhaust tip.

Also if the alignment pin on the muffler is not there during judging. For me personally that would be a notion on the sheet I would make no deduction. That item is so small in comparison to the entire muffler just does not warrant a point in my view. That is for a original "W" only GM service replacement muffler with no other issues.

Paul 18046

[Patrick N.]

Re: 1972 BB exhaust system - judging deduction

Here are some photos of the alignment cutout on the exhaust tip.

Also if the alignment pin on the muffler is not there during judging. For me personally that would be a notion on the sheet I would make no deduction. That item is so small in comparison to the entire muffler just does not warrant a point in my view. That is for a original "W" only GM service replacement muffler with no other issues.

Paul 18046

Paul,
What year/s would this alignment cutout apply? I have a 68 BB and curious if this detail is also relevant.

Regards,
Pat

[Paul O.]

Re: 1972 BB exhaust system - judging deduction

Patrick for 70-72 only.


Paul 18046

[Patrick N.]

Re: 1972 BB exhaust system - judging deduction

Thanks Paul!