i bought aused upper and lower intake manifold for my 302 5.0 mustang engine.
my question is how to i clean the inside of upper intake manifold.
it has this thick black dried oil residue all in it. I tried degreaser and a tooth brush but it doesnt clean it very well and plus i can only go so far.
i want to clean the whole inside if possible because it dont want any of that stuff falling into my new rebuild engine.
i thought about gas but id rather go a diffetent route.

ANY SUGGESTIONS ???

 

Get it hot tanked at any machine shop is your best bet I'd say.

 

how much does that usually cost?

 

you might try using brake cleaner.

 

just get a plastic tote just big enough to fit the manifold in go buy a Gallon of Simple Green (full stregnth) and let it soak overnight. although it might be cheaper to just have it hottanked, i think a engine block only costs like $50 so a manifold might only be $20