Internal Intake Rust
I am currently in the process of putting my 396 back together. I had a bunch of machine work done to the crank, rods, block, heads etc. I took the intake manifold out of storage to clean it up and it is pretty rusty. I want to get the insides /runners cleaned up but I am unsure what to do or use. I am hesitant to to soak it in any type of acid out of worries of tainting the internals. Any recommendations?