NOS mufflers

[Ronald R.]

These numbers show to correct for a 57 passanger car 3719457 and 3714634photo.JPG 11.jpgphoto.JPG12.jpgphoto.JPG13.jpg
this one has these ends that are rounded so I can not use it. The other side was perfict. Any idea what they are different?
thanks Ronnie

[Ronald R.]

Re: NOS mufflers

I have been told appearance wise this one is identical to 53-54 vette factory muffler
RDR

[William C.]

Re: NOS mufflers

NOS in a box from GM means original part number replacement will fit as original, not necessarily identical to...Especially true of parts not originally manufactured in-house. I'd bet there is a date on the box itself well after 1957. As to applicability to a Corvette, I'll let some of the early C-1 Guru's comment...

[Ronald R.]

Re: NOS mufflers

Bill Thanks for your reply. the box is dated 8-55 in my quest I found another one in the box that had the correct flat end but it was not for sale. I suspect the rounded ends were left over from a 53 or 54 and used on this one. It will not work for mine but some one may need this rare one for a survivor or low mileage car. I was luck as the other side was correct for my 2800 mile 59 thanks again for any help RDRphoto.JPG16.jpgphoto.JPG14.jpgphoto.JPG15.jpg

[Troy P.]

Re: NOS mufflers

The rounded ends were made through 1955 and that's what the 55 Chevy passenger cars came with. Flat ends starting in 56.

The 53-55 six cylinder Corvettes also had the rounded ends but they were shorter than the passenger car mufflers. The 55 V8 Corvette mufflers were round and not oval like these.