I HAD A 4412 WITH THE WOODEN SLIDE PLATE IT WARPED AND GAVE US A HIGH RPM SKIP ONE TIME AT A RACE TRACK, WE ENDED UP MACHINEING IT DOWN ON THE CEMENT BLOCK WALL AT THE RACE TRACK. IF IT'S THE WOODEN ONE CHECK IT OUT, WE HAD TO RUN THE THIN GASKETS HERE IN FLA. SO THE PLATE HAS TO BE FLAT.