MerCruiser 32491A1 Upper Gearcase Housing Cap Cover Early IA IB IC EZ 1963-1966 Harmonic Balancer I believe this was also

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

5 1/8" opening

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)

Appears this was used on quite a few other similar 4cyl Volvo Penta Engines from this time period (AQ120B / AQ140A / BB140A etc

0L GM 305 V8

MerCruiser 32491A1 Upper Gearcase Housing Cap Cover Early IA IB IC EZ 1963-1966 Harmonic Balancer I believe this was alsoPart 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!