For years I've been seeing some of what appears to be "rust" at the top of ring travel in the bores..........random holes. That was a gen 1 block/s .
One of those blocks actually had a very fine crack in the lifter galley..........most likely some knucklehead didnt use "anti freeze " back in the day.
And what that meant to me was..the water found its way in to the crankcase and got whipped up into the chambers? OR.......was it?
Anyway , I beat on that block for a while after I expoxy'd the crack and finally retired it last year.
Fast forward to today and a Dart Little M. I'm changing cams and since it was already on the stand I decided to do an inspection............pulled the heads........and I'll be damned......all 8 holes have some "rust?" just below the deck level , in the cylinders. Just like my previous blocks. Now ........understand , the deck is flat........the heads are flat , the gaskets show zero indication of "seepage" , the block cracked......uh , I dont think so
....the Brodix heads look fine.............in other words , there is absolutely zero indication that it is coming from any single source. No water in the pan either.
Now, I do a little sniffing around on the net and from what I can tell , the fuels and possible even oils can and do contribute to this "quandary" I use either C-12 ( VP ) or VP (BLUE ).
Please........step in and share your opinions / experience?