geo65

it appears one side (passenger) of my exhaust is too close to the frame at the through hole in frame. Has anyone seen this and what adjustment did you make?
I see it should favor the bottom, but one is, or nearly is touching at the bottom. 2.5" 327/365 65

wombvette

Nothing a torch and a jack cant take care of.

rongold

=======================

If you're talking about where the pipes go through the transmission crossmember, you should have a support there that the 2 pipes clamp on to. If I remember correctly, the support is sandwiched between the transmission case and the transmission mount. When you tighten the clamps with the pipes loose at the manifolds, the pipes will be lifted to the proper position so they do not hit the crossmember. Do you have the support on your car ???

RON

geo65

yes, I have the support and everything is installed correctly. with the .78 clearance that the Manual states, it leaves a 2.5 in. pipe real close to the frame. with the welding and bracket tolerences I would expect some differences and perhaps shimming would
be required? what kind of movement could be expected relative to the through hole under driving conditions?

rongold

I never looked at mine to see how close the pipes are to the crossmember, but as far as I know, neither one has ever hit the crossmember. I assume that I would have heard it if it did. If you have the 3/4" clearance, and your trans mount is still in good shape (not mushy from oil contamination), they should not hit. I guess that Chevrolet engineered less than .78 inch movement into the mount. If 1 of your pipes is closer than the .78 inches, your support might be bent, or your trans mount might be collapsed.

RON

JohnZ

If you only have the problem on one side, either the saddle bracket is bent or the pipe on that side isn't formed correctly. If you had the same problem on both sides, it could be the saddle bracket for 2" pipes instead of the one for 2-1/2" pipes (they're different, to center the pipes vertically in the opening in the crossmember).

geo65

thanks for your replies...trans mount rubber is new.

well, that's where she sits (and where it was before restoration) and I don't like it. If it should be centered, it's way off, and I would not worry about the slight difference left to right. The AIM claims .78 clearance and that is about what it is. (perhaps that is for a 2 in. system?) Do you see anything from the picture?

Gimme1MoreC1

If you are having trouble with your 2 1/2" just imagine my issues with 3" pipes. I am constantly tweaking and heating and moving things around. I am good for 100 miles and I get to a red light and here come the rattles. It's all too frustrating, as I am close to installing side exhaust or a 2 1/2" chambered rear exit system. I have headers currently, but have a pair of '65 coated 2 1/2" manifolds if/when I switch over. All '66's had only 2", and I have the original manifolds in a box waiting for a future restorer. By the way, whoever he is, he will be lucky as I have saved everything! I love the sound of the 3" with big Borla mufflers. I will miss the sound, but not the rattles.

Frankie the Fink

My C1 is close on the left side and somebody wired a piece of asbestos (or some similar material) around the exhaust pipe inside the frame hole. Plasticman actually spotted it when the car was on the lift at his house. Something else I will get to eventually but it doesn't appear to be hurting anything for now.

geo65

theres plenty of room, they are just not near center... I still think something is wrong.. anyone have a picture?


where can you get Borla for a mid year (model #?). I only find them listed for later models.

Gimme1MoreC1

The Borlas on my C2 are not listed on the website for a C2, as they are 3" in and out. I will get the part number for you as soon as I can get it up on the lift. The part number is there somewhere, I think. They are stainless and sound outrageous. I just can't keep the system in place. What a great feeling it is after spending hours of adjustment, and cranking up the motor, windows down, stereo on........and a few hours later that clang, clang, clang of a pipe banging somewhere. VERY discouraging, to say the least. Better yet, when I change over to ???? sidepipes, chambered rear exit, or something... these mufflers might be for sale, unless I decide to keep for a future project. Like I said, I love the sound.

geo65

I purchased a repro 2.5 in. center exhaust hanger and it raised the pipes to give proper clearance. I suppose the wrong one was put on years ago.

The 2.5 guilitine clamps do not fit too well however as the hanger is a bit wider? ...oh well


thanks for the help, I never would have guessed it.

DansYellow66

JohnZ solves another one.