[quote] I didn't think with a flat tappet, that spring pressures were super critical. Maybe I'm wrong in that thinking.[/quote
I have not found that to be the case at all.
What I find is that people are worried about running high open loads and the cam going flat, and often aren’t running high enough loads for the rpm they’re turning.
I have tool steel lifters, so I wasn't too worried about the going flat part, I just stayed on the lower end figuring less spring pressure= less rotating power consumption.
Could the 10 or so pounds less than the max recommended rate make a 4-600 lower rpm limit?
I also realize things like spring checker accuracy comes into play here and I surely won't swear that mines 100% accurate, but I have assembled some "other brand" pretty high rpm (8-9000 rpm) roller-cammed stuff and spring pressures seemed ok on them.
