67 BB Side Pipes

[Jim M.]

Hi Everyone

I'm kinda new to this but heard alot of good things.
You maybe getting a few questions in the next couple of days. I apologize.

I have a 67 BB 390hp with side pipes. I know they were installed around 1969 but unsure if they are original. Is there a part number I can look for. If so where do I look and what are the part numbers.

Also, are they suppose to be be really loud or are they just worn out.

Without doing my homework, I purchased new Aluminum pipes from Corvette Central but now I think I made a mistake after reading some of the communication from others as they are louder than the originals

Thanks

[Stephen L.]

Re: 67 BB Side Pipes

If you are asking if correct looking sidepipes available in 1969 are genuine GM I'd say yes. I don't believe anyone would be repoping back then when they were available from GM.

Brand new GM sidepipes are noisy(loud). Think about it; they are a straight thru pipe with some packing/bumps etc that exit right next to your seat.... Remember "glass paks"? Older worn out sideipes are just a little louder.......they'll never be as quiet as the new cars of today, they weren't meant to be.

Enjoy your 67!

[Larry M.]

Re: 67 BB Side Pipes

Jim:

Yes, GM sidepipes should have a part number. It should be roll stamped into the forward header pipe section that is between the exhaust manifold and the chambered muffler section. You may also see a "W" stamped there which stands for Walker (Muffler).

The stampings are probably not real pronounced (especially after 35+ years). I located mine by jacking up the front of the car and laying on the ground looking up using a flashlight and small mirror. They were close to where the exhaust header pipe curves into the chambered section.

Part numbers should be #3872969 (LH) and #3872970 (RH) for the big block.

Larry

[Wayne M.]

Re: 67 BB Side Pipes

.... GM sidepipes should have a part number. It should be roll stamped into the forward header pipe section that is between the exhaust manifold and the chambered muffler section. You may also see a "W" stamped there which stands for Walker (Muffler).
..... Part numbers should be #3872969 (LH) and #3872970 (RH) for the big block....

Paid $583 Canadian (about $520 US back in March 2001) for a set of BB pipes. Never even noticed the roll stamping until this thread .

Chromed tip is protected with factory Saran Wrap .