We installed MAC long-tubes on our 88GT, while we were at it - we installed carquest motor mounts. Noticed the drivers side header was rubbing against the steering linkage. Come to find out - the carquest mounts sat the block a little higher than oem causing the header tube to rise and rub against the linkage.
Went with the Energy Suspension mounts, which actually lowered the block slightly, and corrected the problem. If anyone is looking to run longtube headers beware of motor mounts. Even the stock oem ford mounts over time might cause lt headers to rub on firewall or against the steering linkage.
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