[William]

This is a common problem with '69 Camaros when <span style="font-style: italic">incorrect</span> motor mounts are used; maybe Chevelles are the same. I know you checked the mounts but they could still be wrong for the application.

For '69 they switched to the interlocking motor mount design for 302/350/BB engines. The new mount was narrower and thicker than the 67-68 so the frame bracket was re-designed. The listing in some Mc Parts books is either incorrect or confusing and they give you 67-68 motor mounts even if you request '69s. They will fit on the '69 frame bracket but it is a sloppy fit allowing the engine to move fore/aft. The 67-68 mount is thinner so the engine isn't positioned correctly. It's not easy to tell but the correct 69 mount is a tight fit on the bracket; the 67-68 mount will have a noticeable gap on one or both sides. I believe the 67-68 mount is 2-1/2&quot; wide the 69 is 2-1/4&quot;. Height difference was about 3/8&quot;.