Distance from lower gear case to prop

[fishtilubleed]

Next little question how much clearance should there be between the lower case and the prop? what does the 3 blade thrust washer do?

 

[Chris1956]

So you are talking about a Johnnyrude thru the hub exhaust-style prop?

The thrust washer keeps the prop from hitting the gearcase.

The hub of the prop usually fits into the hub of the gearcase, with a tolerance of 1/8" of so.

Is that what you are asking?

 

[fishtilubleed]

Yes I found a SS prop a quick silver in the back with the correct spline but it has 1" of stand off to the gear case. I know its not correct but all we do is jug fish out of this boat. Not looking for speed or power just chase a few jugs down. I think it will cavitate from the exhaust and yes it is exhaust through prop set up.

 

[jimmbo]

has 1" of stand off to the gear case.

???
There is a lot more to prop fit age than just the spline count
Pics would be very helpful