Side pipes

[Roger C.]

[Wayne M.]

Is the Heat-Riser Valve in place ? *NM*

[Roger C.]

Re: Is the Heat-Riser Valve in place ?

Sorry, forgot to mention that my car is a fuel car which does have a spacer between the manifold and the pipe (which is on my car) but no mechanical riser (flap) as on non-fuel cars. Thanks anyhow. Any other ideas?

[Wayne K.]

Re: Side pipes

Is the motor mount different on that side?

[Roger C.]

Re: Side pipes

I have replaced the motor mounts with the correct (nonlocking) type that came with the car from the factory.
Pls let me restate the problem. It is not the car or engine because the original pipes fit perfectly and when compared to the new pipes are of different length. In other words, the manufacture of the pipes changed the blue print or the jig. What I'm really looking for is if others have experienced this problem. I think the problem is in the pipe (right side only) itself.

[Wayne K.]

Re: Side pipes

Roger,

My 67 was a under the body exhaust system which I changed to GM side pipes in 1997. All parts were ordered from Corvette Pacifica at that time and everyting was changed over without any problems. The parts were drop shipped to me and I don't remember where they came from.

[Jack H.]

I'm scratchin' my head....

Sounds like the common problem of pipe cant.... This is an installer issue.

Side pipes mount at a single point in the rear to the frame side rail and to the exhaust mani via three studs/bolts. In geometry, three points determine a plane. So, if you don't follow the book when attaching the pipe, you can easily cant it up OR down by several inches with respect to the forward end of the frame side rail....

The right mounting proceedure is:

(1) Loosely insert rear of pipe in frame side rail cutout.

(2) Start forward end of pipe onto exhaust manifold studs and install nuts 1-2 threads ONLY.

(3) Place a support under the front of the side pipe to make it run level along the frame rail from front to back with the same clearance all the way.

(4) NOW, begin the final torque of the exhaust manifold stud nuts and pull 'er into place letting the exhaust donut swivel, lock and hold the desired final rest position.

If you didn't do the installation in this fashion, you didn't get the appropriate final resting point PLANE at the end of the exhaust manifold and have the wrong forward pipe cant. Kiss the existing exhaust donut bye bye, buy a replacement and do 'er again....