It's lead oxide or led bromide deposits from TEL and lead scavenging compounds
in the older gas. Not unusual and that's not really a large build up you have there. I've
buffed up a lot valves in my seven decades and I've seen some exhaust valves with it as
thick as 3/16". One good thing, it doesn't look like she's been pushing oil which may
indicate that the short block is in good shape.
Install a wire brush on your bench grinder, don a dust mask and a pair of leather gloves
and have at it, they will look like new in a half hour.
Denny Graham
Sandwich, IL
Last edited by Denny Graham; 01/14/2012 2:27 PM.
