The International Cessna 170 Association

Can a severe drop be due to the fact that you are switching off the upper plugs, and the lower plugs are fouled with oil due to new rings?

Thank you very much, I decided not to change anything. I will install one pair of brake master cylinders according to the standard scheme.

Greetings! Could you help me to find a solution? I'm building a project of C170B with TSIO-360CB (I found this engine in a good shape) and planning to use with big boots (may be alaska bushwheels 31'). I noticed, that there are holes in a bulkhead for the second pair of brake master cylinders (for a...