170 with 10:1

[lycomingkid]

Out of curiosity what kind of horse power numbers would I be looking at with a set of 10:1s in my 170 (160 with angle valve cylinders) it supposedly has 9:1s in it now but that’s just was I was told when I bought it last year

 

[lycomingkid]

.

 

[BobBrack]

Not sure about the HP boost. Maybe 8 HP or so. I will say this. You will have to run 100 percent avgas at that point. If you dont like 5.00 per gallon fuel prices it will not be worth it. Is the engine a wide deck by chance?

 

[lycomingkid]

It’s a narrow deck motor with 480 cylinders on it and all I’ve ever run in it has been av gas since the day I got the boat