I have a 1988 bravo one upper with out the oil passage. Over the winter I picked up a new used lower that has the oil passage. I did not know this was an issue until I went to put it all back together. Can I block this passage off to make things work or should I start looking for a new upper that has the passage. If I can block it off what would be the best way to do so?

Thanks for your help guys!

Ayuh,..... Just what oil passage are ya talkin' 'bout,..??

The oil res in the boat, with a hose to the drive, is only to the upper unit,.....

All uppers, 'n lowers have an oil passage 'tween the units,.....

not true ....older generation B1's did not have the center oil passage ..... I have blocked the newer uppers when using older lowers....used a Allen set screw ... not sure about blocking the lower ...check with MrGadgets ....but they are different .....m

Sorry,.... My bad,..... To many years dpin' Alphas, 'n not enough doin' Bravos,....

I blocked the lower with a allen set screw and worked fine all summer thanks for the help!