[sammydafish]

Anyone have any advice?

do a leak down test to see where youi're loosing the compression. cyl 3 is your biggest concern. You could have a cracked piston or broken rings. Or you could have a sticking valve or a seat that droped. Based on the leak down you'll know of you've got top end/bottom end or HG issues and can go from there.


you said you had issues with your PCV system, is it hooked up like stock?

 

[sammydafish]

Detonation is caused by to high cylinder pressures for the fuel misture at the current cylinder pressure. Going lean is only one way to cause it. To much boost with to much compression is the much more popular way. That or crappy gas.

Good luck

 

[sammydafish]

not necessarily, you could put a hole in a piston or a nice crack and have no mechanical noise at all

 

[sammydafish]

BTW, ATK is a good company to deal with. I've put in dozens of thier engines over the years. Never in a performance scenario. My experiance with them has been simply repairs.