[fyrffytr1]

I decided not to use the PM 136 in my 67 GTO for a few reasons. First, the blower wheel on the 136 is over an inch shorter than the 102 that came in the car. Second, the blower wheel is plastic and has a press fit on the shaft. The 102 is metal and is secured to the shaft by a flat spot on the shaft and a flat on the wheel hub that keeps the wheel from spinning on the shaft. Third, the vent hole in the 136 is smaller and the cooling hose won't fit it.
But, the main reason is that it doesn't move the air any better than the original, probably because of the shorter wheel causing turbulence in the housing.
One thing I did do was add a ground wire from the motor housing to the firewall. I read in another thread that this helped.