Re: 1992 6hp with 8hp carb.
CATransplant. Theres two categories for cylinder block but pistons are the same serial.
Not sure why they would place 2. The reeds and muffs are the same and would be the main issues as the stroke being alittle off set. Could be porting. Runs very smooth tho and crisp throttle.
I think there just trying to confuse people.
Actually, I'd be willing to bet a lot of money that the porting in the 8hp block is quite a bit different than the 6hp. That's why there are two different part numbers for the block. The internals are the same, but if the porting is different, that will make all the difference.
I suspect that you aren't going to get 8 hp out of your 6 with an 8 carb. Not even close. There's a reason for the two different blocks, and that reason adds up to the extra hp.
As I said, let us know what you find on the water. That's really the only test. The extra 2hp make a big difference on an outboard that size. Wish I had an 8.