Don't have any close ups of the Plugs. Plugs are relatively new so may not be a great indicator of much. But it looks like most everyone agrees looks like detonation marks. If I correct the detonation is there any issues running the pistons as is? Clearly if I yank the motor I would replace the pistons. Was wondering if I could shim the heads to lower the compression which would be the easiest way but not sure if that would be enough to lower the count by 2 which maybe whats needed...... I have to find someone with a Whistler here in Phoenix.