70 TA muffler
 

My attempt to install a 70 TA muffler on my engine test stand was unsuccessful. The muffler is a few inches wider than the aftermarket replacement cross flow muffler I am currently using. Because of the width difference I couldn't use the existing brackets I made to mount a muffler.

I'm curious if the "6 70 A" is a date code? Also is it possible the tail pipes were welded at the factory?

Yes to both of your questions. "6 70" is the date code and the rear tailpipes were factory welded onto the muffler. There are several original assembly line pictures showing this to be true.
Service replacement parts were sold individually and would most often then be clamped.
Also note the Oldberg name. They were one of Pontiacs outside suppliers of mufflers "back in the day".
Quite rare to see even a rusty old one original like you have. My '70 had already had a muffler replacement as it was dated '76. At least it was a GM replacement.

that's pretty cool!!

Agree with what is posted above. Here's images of the original Oldberg 3 70 A one I have. The rear pipes are wended on like those above.

What's the replacement part number for the 1970 dual exhaust cross flow muffler?

This is the muffler I use now. The case is about 2.5" narrower that the factory muffler. It came from a 73 TA.

I have an Oldberg unit, dated '71, just like yours. Tail pipes also welded on. I'll post pics later.

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