Running a ported 2650 on a LT4 Z06 and we hit 19psi. The car hit knock at around 4k every time no matter how much timing we seem to take out of it.
Did we hit a limit here? The car is running meth too so octane shouldn't be an issue and the injectors are only at 5.4-5.5 pulse width.
After it peaks around 5k the boost seems to leak out to. I wonder if the blower pulley is to small (2.75) and we're getting belt slip