Have we ascertained that this engine is indeed an ABN engine, mine is not very old and is a Dykes ringed engine which has lousy feeling compression when flipping but runs very well. I just ran it with a 12x5 Graupner that I had ran on a Fox .50 the other day, the Webra turned this prop at 13,181 rpm on 5% nitro while the Fox .50 turned it at 11,820 although the Fox is inhibited by the Fox Quiet Muffler and a smallish .247 Perry carb. The Webra impressed me with this number.

Vern, my LS needle is approximately 1/16 inch from the end of the spraybar at full throttle.