1965 Off-Road Exhaust Option

[John S.]

Do the mufflers on the N11 Off-Road exhaust option have "GM" and "3845735" and "3845736" numbers embossed on the mufflers?

Thank you in advance for your help.

[John M.]

Re: 1965 Off-Road Exhaust Option

I have a NOS pair of Off road pipes and Mufflers with 3845735 and 3845736 embossed on them so I would say yes.....Thanks John Meissinger

[Donald T.]

Re: 1965 Off-Road Exhaust Option

John,

You don't want those old mufflers laying around just taking up valuable space do you? I'll take 'em off your hands and even pay for shipping!

[John M.]

Re: 1965 Off-Road Exhaust Option

Donald most of you know where they will show up for sale at no reserve...Thanks John Meissinger

[Donald T.]

Re: 1965 Off-Road Exhaust Option

Donald most of you know where they will show up for sale at no reserve...Thanks John Meissinger

Oh, I'm well aware. I've bid on them before, but someone else always seems to have deeper pockets!

[Wayne M.]

Re: 1965 Off-Road Exhaust Option

Do the mufflers on the N11 Off-Road exhaust option have "GM" and "3845735" and "3845736" numbers embossed on the mufflers?

John -- here's the top emboss on my RH N11 muffler, definitely SERVICE, circa 1981. Bottoms are similar. There is controversy on what was FACTORY, with a tendancy to side with Noland's Vol 2, where he shows that (If I remember without checking) there were NO embossed #'s with only a yellow "Off Road" stamp, to differentiate from hi-horse NON N-11 systems. Previous discussions with John H. and/or Michael H. and others on this subject, either in the archives or on other discussion boards.

[Steve B.]

Re: 1965 Off-Road Exhaust Option

Wayne,
I saw an exhaust sytem on a 67 BB that looked and sounded like N11 exhausts but did not have the 735/6 #s embossed on the mufflers. The only thing that was embossed was GM and #s similiar to what is on the bottom of your muffler. My friend wants to know if these are N11s and while they are welded I was not sure since I did not see the other #s that I am used to seeing. Any help would be appreciated. BTW I saw no ink stamping.

[Joe L.]

Re: 1965 Off-Road Exhaust Option

Wayne,
I saw an exhaust sytem on a 67 BB that looked and sounded like N11 exhausts but did not have the 735/6 #s embossed on the mufflers. The only thing that was embossed was GM and #s similiar to what is on the bottom of your muffler. My friend wants to know if these are N11s and while they are welded I was not sure since I did not see the other #s that I am used to seeing. Any help would be appreciated. BTW I saw no ink stamping.

Steve-----


I don't think all original N-11 muffler assemblies had the embossed part number on them. I'm not sure if any did, but I would not rule that out. I would also expect that older SERVICE assemblies were probably exactly the same as the PRODUCTION with respect to lack of embossed part numbers. Most of the sets of these mufflers seen today are of much later vintage since these mufflers were available in SERVICE until the late 90's. It MAY be that at some point GMSPO ordered the addition of the embossed part numbers for easy identification purposes.

In any event, as far as the mufflers welded at the muffler to the pipe, BOTH N-11 and standard exhaust were exactly the same in that respect as far as PRODUCTION was concerned. Of course, only the N-11 were available in that configuration in SERVICE.

Without any visible part number, there is no way to discern a standard exhaust set-up from an N-11. All of the differences are internal. There are no other visible "cues".

[Steve B.]

Re: 1965 Off-Road Exhaust Option

Joe,
That was what I thought but was not sure, thank you for taking the time to clear that up for me.
Regards,

[Michael H.]

Re: 1965 Off-Road Exhaust Option

John -- here's the top emboss on my RH N11 muffler, definitely SERVICE, circa 1981. Bottoms are similar. There is controversy on what was FACTORY, with a tendancy to side with Noland's Vol 2, where he shows that (If I remember without checking) there were NO embossed #'s with only a yellow "Off Road" stamp, to differentiate from hi-horse NON N-11 systems. Previous discussions with John H. and/or Michael H. and others on this subject, either in the archives or on other discussion boards.

The set of "off Roads" on my 66, purchased/installed in about 1983, are dated 164-9 (164th day of 1979?) for the right side and 324-0 (324th day of 1980?) for the left. (if, indeed, these numbers are dates)
The right side has the embossed part number and date code. The left side has only the date code, no part number. ???
The dates/codes are on the bottom of the muffler.

A set that I installed at about the same time on my 63 has the part number and code on the top of the muffler.