never had any good results on painting headers..it allways burns off
I use the duplicolor spay bombs after sand blasting the block or degreaseing with oven cleaner,wash it down with brake clean and dry
I used 3-4 cans of paint..hemi orange for the long block myself
the pullys I use the rustolium in brush on,after sand blasting then paint or spray with the HVLP gun..
I also have been painting the frame,under hood,fender wells,inside cab/jambs with the rustolium,turns out good,IMHO
I got a gallon of black,and a can of lacker thinner..less than 50$
just about have done the whole truck for the black out paint
you could use some implement/tractor paint with hardner,that holds up fair on an engine,about 50$ also,thats cheap to spray
I would think the rustolium paint would brush on the engine fairly well and hold up maybe
all shade tree ideas though