I am curious about the 3 Max Power engines. I don't know the difference between the 3, so can someone tell me which one is best, faster, ect?

the simples one is just the same as a nova ns3........

the p3 and s3 versions are selected and tuned by Massimo Fantini.......the difference between both is just marketing,..

I think that the P3 is a CNC piston and the S3 is microcast.

Well, I was curious, so I bought a P and I had an S. I took them apart and took a good look. The cranks are the same other than the turbo scoop. Its larger on the P. The Port work on the sleeve is also larger on the P. and the piston is a machined piston. Other than that, I don't see much of a difference. The timing is 2deg different too, but thats minor.

anybody else know?

I think the differences you noticed are due to different batches.........