I've noticed this too while checking timing with the plates facing down. Curve will stop at my target 32 deg. than as revs increased timing would slowly increase untill I chickened out. Then I read an article by Rocky R. about this and flipped the center plate and timing curve stopped at desired rpm.
Glad to see some research to back this thou.
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best 1/4-11.37 @ 118.03, 96 heads on motor. 11.05 @ 120 on 100shot.
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