Well . . . after much hand-wringing and midnight consternation, I realized that those standard 1UZ valve springs just weren't going to do the job. At only "42-46 pounds" of seat pressure, they are a tad too light for my high lift Kelford cams at my intended 7000 rpm shift points and at the quarter mile finish line. Kelford recommends "80+ pounds" seat pressure for the
201-T1 grind. So, what to do? The racer in me said to forget the standard used 2JZ springs -- mainly because I have no way to test them, and because they are rated at "62 pounds" of seat pressure -- so I bit the bullet and purchased a new set (32) of
Brian Crower #BC1300 2JZ valve springs with this specification: "
Spring Pressure: Seat: 1.325" @ 80 lbs / Open: 0.980" @ 158 lbs / Coil Bind: 0.810." I will use the standard 2JZ spring retainers (used) - no need for titanium at only 7000 rpm. Imagine finding a set of Brian Crower valve springs for a 1UZ in Bangkok! Thanks Khun Mac of
MacTec . . . he has everything! It looks like my shop guy Art will be pulling the heads off, replacing the springs, and re-shimming those 32 valves one more time!