On a Norvel .061 whci is better, the pressure tap on the muffler or the cover plate with a pressure tap> I have an older engine which has neither so if Im going to buy either a muffler or backplate I might as well get the most efficent one.

Unless you drill the venturi out farther, muffler pressure is quite satisfactory for stunt flying.  With the much higher pressure from a backplate tap, the needle gets touchy. 

Unless you drill the venturi out farther, muffler pressure is quite satisfactory for stunt flying.  With the much higher pressure from a backplate tap, the needle gets touchy. 

What about the AME (3 port) version.  Has anyone use backplate or muffler pressure to get a consistent run without using a bladder?

Heman,

Never flew one that way. Those are the bathtub intake silver fin version?

On the bench, they were still tricky to start and set, repeatable restarts didn't happen for me on  backplate tap pressure. Limited experience but still one comment...

The AME and the Big Mig engines came with either the small silver fin version or the larger dark fins.

An electric starter is almost a must, with or without pressure.  Yes, they can be started by hand, but why go through the aggravation?

Muffler pressure still works with the AME (high performance) version, but for all out speed/power, back plate pressure is best.  Makes needle settings a bit more tricky.