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The lighter inner weight will increase both WOT shift points equally. If you get one shift point where you like it, but not the other, you’ll need to mess with the shift valve springs too.
the reason I asked was because I put a B&M shift kit RV street not race in my 1967 Newport 383 2 barrel that shifted at 4400-4500 and with the kit it went to 5000-5100 rpms. I want to do it on another car that shifts at 4600 rpms now. I don't get it a lot of tranny guys say it won't help but what happen in my 67 Newport to raise the wot ? don't want to do all that and not change the rpm shift