Tach
What is the Ser # of your aircraft. The maintenance manual said that at ser # 337-0757 that started using the extra breaker points in the mag. Hope this helps.
Fred N358 ser# 337-0737
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N358 1967 337B Normally Aspirated,
KX155, Mod "C", Cessna Auto Pilot 400, 4 Seats, 3400 TT on Airframe
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