[twobjshelbys]

It's a cheap roller. Take the engine out and put it on craigs list and replace it with a Ford.

You really need to understand the source of the stress that's cracking the glass. Understand that first. If it's the frame run, don't walk, away. Mine was getting a little bit of stress by the side pipe ports. Nothing a little motor mount adjustment didn't take care of. You really need rigid mounts as the flexing that happens under the torquey acceleration can cause the engine to lift especially on the drivers side. I believe that SPF even has a motor mount adjustment tip published. (Drill a hole and bolt it.)