well, the block starts to experiance flex at 20lbs, which cracks stock caps, and i bet it will knock at less boost than that which can blow a head gasket, that is what i am worried about, i don't want to blow the back off of another motor. Last time i was running 23 lbs, i had no knock, but i blew the backhalf of the block off, and chucked the crank and the tranny bellhousing was in 34 peices. This was all because the block was flexing and it cracked a cap. You will make more power on a 45a at 16lbs than you will with a stocker with 16lbs, if you don't think so you are stupid. If my 51 feels like it makes less power than my stocker, i wouldn't be worried why some guy wants to buy a 45a and run 16lbs of boost.
Nicholas