1968-1969 exhaust tip question

[John S.]

I have some NOS exhaust tips, some with 2 slot and some with 4 slots, that is on the rear where it slips on the muffler. Were these 2 different companies making these or did one year take a 4 slot and another take a 2 slot. Thanks for any help. john

[Joe L.]

Re: 1968-1969 exhaust tip question

John-----

The 1968 and 1969 extensions were different. However, to what degree and just how they were different, I do not know. I wish I did. I do not think, though, that the number of "slits" was different; I think that both had "2 slits". Anyway, the 68-only extensions were GM #3921607. The 69-only extensions were GM #3952742. The 3921607 was discontinued in January, 1970 and replaced by the 3952742 for SERVICE.

In February 1980 the GM #3952742 was discontinued and replaced by GM #496346. Another earlier part number, GM #550730, was also discontinued and became the GM #496346 for SERVICE. However, the GM #550730 and the 496346 were never originally used on Corvettes or, even, any Chevrolet product. They were originally used on some Pontiac and Oldsmobile models. I don't know which ones, though. I think that it's the 550730 and/or the 496346 which have the 4 "slits", although I'm not sure of this.

If the parts you have would shed any light on this mystery, I'd be interested in seeing photos of them.

[Grant W.]

Re: 1968-1969 exhaust tip question

Hi Joe and John
Factory 68 and 69 tail pipes have 2 slits. Any 4 slits is over the counter GM parts. I have a set of early NOS 2 slits tail pipes but packed in the round paper. It fits over the pipes like a glove. Most tail pipes you get in a box from GM is the later NOS versions. Now here is the kicker. There is a 68 only tail pipe and a 69 pipe. Some people mix and match. 68 tail pipe is different from a 69. Merry Xmas to all. Grant

[Dick W.]

Re: 1968-1969 exhaust tip question

I will second the "would like to know the difference"