Originally Posted by Hongie
sorry for the thread revival.
is the cirlced bit the tab you are talking about?
I'm experiencing high CHT #3...
No. The "small tab" referenced is located right at the base of the cylinder, adjacent to the hold down nut. That needs to be bent into position (often isn't), and RTV'd shut (rarely is).
That said, the fin wrap shown in your picture should be tight against the fins (isn't), but as that's the #3 and does not have a bypass duct modification, it's not moving much air anyway so probably doesn't matter.
If the picture is your airplane, then build a bypass duct, tighten up that lower wrap, and your temps will come way down.