MerCruiser 32491A1 Upper Gearcase Housing Cap Cover Early IA IB IC EZ 1963-1966 Harmonic Balancer but equivalent and replaces to

but equivalent and replaces to any of the following numbers: (Does not have provision for the extra water outlet as seen on some variants with these same casting numbers)

I believe this was also used on some 350 35hp & 400 40hp & 450 45hp models from this time period

Found on Mercury Mark 40

Appears to be compatible with years 1973(midway-1974 (1973

but you do need the 42259-C for V-Engine Applications that require the 5-bolt style (Utilizing the top and bottom 2 bolting locations)

MerCruiser 32491A1 Upper Gearcase Housing Cap Cover Early IA IB IC EZ 1963-1966 Harmonic Balancer but equivalent and replaces toPart Number(s) Included MerCruiser 32491 32491A1 Upper Gearcase Housing Cap General Application Compatibility This would have only been found on the Early "alpha one" applications 1963 1966 MerCruiser I 1963 MerCruiser IA IB IC 1964 MerCruiser IA IB IC (EZ Shift) 1965 1966 Other Details Freshwater Used Parts Original Paint Overall Good Condition! Purchase with confidence!