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Wow old thread.
If you dont go above 6500 rpm you dont need new springs on hi tech stage 2's
that is not true if you need to replace springs with the higher lift cams it really dont matter
how high you rev it has to do with lift if you run stock springs on stg 2 cams you will run into extreme valve float so with stg 2 cams you have to replace the springs r it not even worth swapping the cams