Chevelle Tech - View Single Post - Header Fitment Doesn't Look Right
View Single Post
post #23 of (permalink) Old Dec 28th, 14, 12:04 PM
Philip
Administrator
 
Join Date: Feb 1999
Location: Marana, AZ
Posts: 16,039
Garage
Re: Header Fitment Doesn't Look Right

Have you measured the distance between the upper control arm mounts? If the crossmember sags it brings the upper arm mounts closer together.

Here is some info from http://www.einstyn.com/

Quote:
It is very important before putting too much work into the frame to check it for “frame sag”. Frame sag occurs with age and use of a vehicle. It effects the front-end alignment. If a frame is sagged too much, you can tell if the front-end alignment cannot be achieved and all the shims under the front upper control arms are out from between the c-arm shafts and the frame. By measuring the distance between the c-arm mounts you can see how much your frame has sagged. A new frame measures 32”. A frame that measures 31-3/8” is too close. You should have at least 31-3/4” to start with. You can get away with offset shafts if it is not closer then 31-3/8” but the best fix is to take it to a frame shop and have them pull it back out to 32” while you have it apart. If you are using stock c-arms there is a concern with the clearance as frames sag, between the c-arm shaft bolts and steering shaft and the exhaust manifolds or headers on big blocks.
Mine measured 31 3/4" and the headers clear fine. The clearance is substantially more.

Hedman shorty headers from a 67 Camaro are being used. This was during mock up of the 72 frame build.


Team Chevelle Gold Founding Member #42

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
L29 454, 4L80E, 12 bolt posi 3.31, GM 4 wheel disc brakes
63 Nova wagon

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Philip is offline  
 
 
For the best viewing experience please update your browser to Google Chrome