I hate to tell you that the M/T ET Street radials don't work worth a hoot on a bad track, the regular ET streets do a lot better I have both types for my car, I run the radials on the good tracks, 1.39 60 fts and the bias plys on the bad tracks, 1.43 60 ft on the same track, same day. The radials won't run 1.60 on a bad track where the bias will run 1.49 to 1.52 Does the motor hit the same RPM limits in all gears or just high gear ? If in high gear only look at the fuel system, if the same in all gears look at the ignition sytem or tach Good luck on getting that rat motor rascal Put the hammer to him