Manifold pressure tap on the Lycoming IO 540 C4B5

If you are planning on using an IO 540 out of a Piper Aztec keep in mind the manifold pressure tap is on the number 6 cylinder (this the left rear cylinder from the pilots view) whereas Van's has used a tap off of the number 5 cylinder (right rear.) I mention this as a heads up to make sure the old pressure tap off the number 6 cylinder gets properly plugged, otherwise that cylinder would run really lean if at all!



In the first picture you can see the number 6 cylinder with a new plug installed with fuel lube and torqued to the correct setting.










The second picture shows the newly installed manifold tap as used on the RV 10 aircraft.