A grand or so? Borescoping is now considered a standard part of the
compression check for Continental engines, and I do it regularly on
every annual. Borescoping involves little more than pulling a spark plug
out of each cylinder, and shouldn't cost any $1000 or so! Unless you
have a piston disintegrating, borescoping won't tell you much in your
case, either.

Robert M. Gary wrote:
I've had slightly high aluminum for the last year. I'm not happy about
it but everyone says its not high enough to spend real money pulling
cylinders or boroscoping. I'm curious what the group thinks...

IO-360-A3B6
SFNEW 682
At each 50 hours change I've had...
7, 10, 25, 13 (short sample), 24, 23 ppm

I don't think I have an alumimum dip stick (at least my A&P says I
don't). I'm not finding anything in the filter.

I'm in California so everything is pretty pricey. Should I spend a
grand or so having the cylinders boroscoped?

-Robert