Checking Magneto Serial Numbers

The magnetos installed on my IO-360-M1B Lycoming engine are as follows:

Left magneto: SN: 13050795, M-2983LH, Model: 4373

Right magneto: SN: 13050824, Model: 4370

According to Lycoming operator’s manual, the left magneto should be model 4371.

Slick/Champion service bulletin SB1-12 (corrected copy) is not applicable (SNs: 11110001 thru 12030902).

Magneto gasket part number: 62224?

Slick Mag gasket part number: LW-12681 (need 2 for impulse mag side)

Useful VAF Post

Mag parts

Slick SB

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