It all depends on what setup you run. Stock cam, the valve covers come off when it hits the bone yard. Proven, known solid lifter flat tappet combos, once stabilized, once a year? A radical roller, with aggressive ramps and very high spring pressures, every few passes, or if the car slows any measurable amount. Never had a catastrophic failure (whole engine lost due to valvetrain trouble) but have caught many parts going away, was able to fix and race the rest of the day.


8..603 156 mph best, 2905 lbs 549, indy 572-13, alky