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I used to use the Colt stage 2 regrinds, but then needed one quick and all he had was stage 3's on new cores. I have used the stage 3's ever since. You don't loose anything, but the mid range and top end are excellent.
Most cams I have pulled out in the past 5 years, even with 3000 mile oil changes since new, have had serious cam/lifter wear I would attribute to the lack of zinc in new oil. So I just plan on a new cam and lifters in every engine build and do the Colt stage 3 even on stock engines.
Most cams I have pulled out in the past 5 years, even with 3000 mile oil changes since new, have had serious cam/lifter wear I would attribute to the lack of zinc in new oil. So I just plan on a new cam and lifters in every engine build and do the Colt stage 3 even on stock engines.