OMC Powerhead?

[Tireman]

Any help would be greatly appreciated. I have a 1989 GT 150 Johnson. What all Year models and size powerheads will bolt up to my mid section?
re: 150-235?

[racer]

78-85 150 to 200 hp will fit. 86-91 150 will also fit. 235s will not with out an adapter change and the same for 86-91 175s

[Tireman]

Thanks, for the quick answers. This is a great help. Where would you find the adapter that you refer too for the 175 and 235 change?
Thanks, Tommy

[racer]

They are not too hard to find, I am sure I have a couple.