found my mr gasket 925B spring set & they state: the OE light spring and (1) Mr gasket light spring, this combo maxes at 2400RPM. as we know spring tension/weight friction etc varies but it should be fairly close. sheet also stated both mr gasket springs will max at 1200. EDIT no info given on the start RPM for one or both but it'd have to be fairly close to the OE springs as far as tension goes