I am ready to re-install my 216 cylinder head. There is a fair bit of carbon on top of the pistons- perhaps 1/2mm thick in the centres of the pistons. I've tried scrubbing with carb cleaner and a stiff nylon brush, it doesn't do much.
My question is: Can I use any sort of WIRE brush to scrub the piston tops (at TDC) or will that ruin the pistons?
Do they even need to be cleaned at all?
