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I don't prime them, I just paint over bare metal (as did the factory) be sure the metal is super clean and use a good acid based metal prep like Ospho first.

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There are very few things that I use rattle can primer on anymore. Seems like the quality in that type of primer is very poor and does more harm than good.

The only reason I use primer on engines is to even out all of the dark color parts and the light color parts. Because of this I only use 1 1/2 cans of color to cover the entire engine. If no primer was used in would of been over 3 1/2 cans.

BTW....I only use 1/2 to 3/4 of a can of primer on the engine before color.