Never understood the logic behind painting the inside of an engine unless you were going to put it on display. Any engine we used in the midgets or dragsters that I've worked on that had suffered any kind of failure was completely pulled down and meticulously cleaned using solvents then detergents and mechanical help like stiff scrub brushes and wire brushes for the oil galleries. Any engine that had any machine work done to it got the same treatment obviously. We never had these things back in the day, but everyone seems to have a pressure washer today. 3,000 lbs. of warm water and detergent is certainly going to blast any grit from even the tightest corner. If your casting has porosity then you have a bad casting. However, if your talking about the pores in the graphite contained in the matrix we are looking at nanometer porosity. I doubt if any particle on this level would be detrimental to the operation of an engine. Surface Stress relief by smoothing the internal block surfaces, sure I agree with that, but painting it, to seal the nano-pores nope, don’t make sense to me.
I worked with High Vacuum systems most of the three decades I spent at the Accelerator lab and we used Glyptal mostly for sealing vacuum and hydraulic pipe fittings and as mentioned, as a insulating varnish for binding fine wire coils and such. As a commercial electrician I'm sure you've seen Glyptal used in motors and electrical apparatus many times Pete.
And like Bill said, the earl is gonna cover the inside of the engine as soon as you light the fire. That’s gonna prevent any rust from forming, unless of coarse you “store it outside at the farm this winter”
Make it purty outside and don’t worry bout the inside buddy.
Note from a purest: Now, on that outside, make sure you use the Engine Gray (FS-359) from The Filling Station. You know by now that’s the correct gray for that engine, isn’t that right Woody???
Denny G
