Well guy's thanks for your thoughts, but was doing some more runs today on the 35 and noticed that while it was running i could see bubbling around a section of the head.So i have replaced the 35 with a fox .40 rocket that the piston and liner were shot but the case was in great condition, so i took the piston and liner and head from a Fox .36,( which the case bushing was shot), I had to use the rod from the .40 and installed all of it into the Fox .40 Rocket case, i had to notch the bottom part of the liner so the rod would clear, and shave the head and baffle on the top of the piston.I had done this sometime back but never got around to running this put together.Well today i ran several tanks thru it very rich and sloopy, last tank i lean her out man she seems to run strong.Will see how this plane fly's this weekend, wind permitting.

Question.In regards to performance,is the slant plug head better than the straightup plug design ?Does that make sense? Or what is the reason for the slant plug design and the straightup plug design?
Thanks again guy's.