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Quote:
Originally Posted by Marshall V. Daut
I'm pretty sure my Ron Kelley engine from the late 1990's had rotators on the exhaust valves. He said it keeps the hard-working exhaust valves from seating in the same place every time. It's supposed to keep the valve from getting too hot, although I'm not sure how that is effected. I don't recall if Ron installed stronger springs with the rotators.
Marshall
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I understand why they would have them on the exhaust valves as the valves run hotter on the side closest to the flame path. But for the minor cost of 4 more, I would think it beneficial to have them on the intake valves as well. Even today they can be had for about $10 USD each.