Overheating problems. I remember that George Berg and I did a comparison of water pumps once. Problem is, I can't find the notes and pictures. My spare re-built pump has 10 blades on the pump impellor. Is this an original??? For some reason, I remember a discussion about pumps, the upshot was the C needed the water to slow down, and a LOWER number of blades were on 300 C from stock 392. Tuesday we start re-assembling my engine (took a few weeks to get new piston rings). I'll try finding my pics and notes, but if anybody knows what impellor should be in 300C, please post!! L.A. Jugle, Elmhurst,IL