switching to aluminum high flow waterpump, questions...

I did this on my 65 273. My motivation was because the alum w.p. was 1/2 the cost and seemed better. I suspect my new radiator was intended for a slant (1.5" bottom tube). That was at the Autozone desk. I am wiser now (ebay troll). Roll up your sleeves.

The extra 1" thickness makes me unable to use a clutch/fan, so got a thin Summit nylon fan w/ no spacer. Your TRW p.s. pump was never used w/ the alum w.p., so no brackets exist. I got a later Federal p.s. pump (looks similar) and new brackets from maybe Bouichillon Performance (BPE). It sits lower and barely clears the K-frame. Might have been better to get a Saginaw pump (more efficient and common). You will have to change to later p.s. hoses since Federal (and Sag?) pumps have an O-ring outlet (not inverted flare of TRW) and a smaller return tube. I also changed both fittings on my p.s. gear to match (or make custom hoses).

I had to play with pulleys. My car has the original crank damper, but I cut a new slot to match the new timing tab. A later damper might make crank pulleys easier (thicker?), but don't get one for a cast crank (I think). I have the original 2 V metal crank pulley with a 3rd V alum pulley inside for the after-market AC (had beastly Tecumseh compressor). As I recall, my alternator runs alone off the middle V and p.s. and w.p. run off the 3rd "AC" V. The inner V looks so buried w/ the alum w.p. that probably unusable. When I add AC, I will likely run it off the alternator belt. The w.p. pulley is a very short alum one (ebay), not nearly as deep as the original steel one. I posted photos some time back of my setup. I recall others routed belts the same. Can't tell you belt PN's, but just download a Gates catalog. V-belts come in 3 widths and every 2" increment in circumference, so easy to pick the PN you need.