I spent the weekend grinding away at the exhaust ports mostly. Look really nice, but even with my air gun on 100 psi I'm still seeing those particles all over the heads. Do I dunk them in my parts cleaner, do I use various size magnets to pick up all I can, then dunk them? Would taking them to NAPA for an acid bath be better? Will try to post pics tonight. I did get close to the exhaust valve guide, and am taking them to a local engine shop (NVR Racing just west/northwest of Milwaukee). Eric.