Do you mean Speed Pro H116CP pistons? The 416 PN is not registering with me. Or is this a 416 stroker? This engine must be pushing into the 12:1 SCR range if this compression pressure if true and with this 271* advertised cam.
For H116CP pistons and Edelbrock heads and this cam, and a typical setup, this compression pressure does not work out to being even close to reality; that is why I ask about the gauge being correct, the pistons, the cam being very advanced, etc. Just trying to make sense of your numbers before commenting on tuning.
