Originally Posted by Richiehd
That inside is painted with Glyptal, thats painted for oil control. Used extensively in racing applications. There are a couple of threads here on it. Don't worry, it's not coming off.!!
I Know this is an OLD post but as you said to the above post I also paint the inside valley with Glyptal Gray designed for electric motor after gringing valley smooth and chamfering drain backs and I useepoxy to hold in drain back screens to catch any debris,,needlebearing from roller rockers or broken studs or pushrods ,metal chips in oil pump not good ,,as do all racers in this area,
just a side not after cleaning the block as clean as possible I use a heat gun and a hand held propane torch to remove ALL signs of grease ,oil or FINGERPRINTS before painting POR 15 is a great choice there is not a chemical that I have found that will remove it, one of my recent builds