Not to sound like a smart a$$, but the kind that stays on the engine. I painted mine twice. The first time I really didn't care if the paint stayted as it was more of a covering than anyhting else ( looked cool also ). But most flaked off while the parts were manhandled. Ended up on the the phone to a race shop for VHT.
It has held up okay.
The paint on the nuts for the studs didn't last, but it can be touched.