Back on page 18 of this book, I posted where I had been unable to find a cast impeler pump. I tried the plate clearance mod with my stamped impeler pump and it did not help. I've had everyone I know hunting a cast pump since and I finaly got my hands on on this weekend. I'm running the '67 style timing cover with the 8-bolt pump and two plate setup. The '67 cast impeler has "flat" vanes instead of the tapered ones like the later style pumps. My 8-bolt stamped impeler was also tapered like the later style pumps. I had to do major rework on my plates to get minimal clearance to the "flat" vane style cast impeler pump. It was only in the low 70's here Saturday after I got the pump installed and the temps seamed to be lower after the swap to the cast impeler pump. Sunday the temps were back into the mid 80's and my temps were also back up. So, it wasn't the silver bullet, but it may have helped some.
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