Was going to do this, but it suggests that it only applies to the 11 bolt pumps. Thought all 1st gen pumps were 8 bolt? Mine is, so I guess I can't do this mod on mine.
It is a bit more complicated on a 8 bolt pump but still should be done. Problem is the rear plate on the 8 bolt is fitted inside the timing cover. I lay both plates on the water pump and just get the impeller to touch the plate. Also make a few bends in the outer edge of the plate so it gets sandwiched in between the water pump and timing cover and doesn't move around. With the water pump gasket installed you have proper clearance.
I've done the mods on a 8-bolt pump. Anything to move the plates closer to the impeller is helpful amd every improvement on these cooling systems is good since cooling is such a common issue.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI
