Two engine test runs today plus I got to take my GIB for a quick 3 min run on one run. I tested the radio intercom with the GIB and also a radio check with the FBO. I was able to confirm zero engine noise with radios. I still need to test with lights on next time. Withe the second run and solo I tested the magnetos. ran the engine up to 1800 rpm and tested for rpm drop with left and right mags. I gpt abput 80 rpm drop and 20 betwen the two. Also checked fuel psi to be at 5. all sems good so far and no engine sputtering or delays when advancing throttle or retarding the throttle. CHT quickly were aproaching 350 f in about 3,5 min and had to get back to hangar for shut down before geting too hot. The final test was to shut down with the mags instead of the mixture to verify grounding. That was successful as well. No leaks noted as well and all looking well.