Well first of all what was bad on your head? 99% are cracked and it does not hurt anything. On the vane pump: We probably had 200 Olivers running around here when I worked for the dealer with the vane oil pumps. Never changed the vanes in any of them. That is the last place to look when you have low oil pressure problems. Did your head have valve seats in it? Early ones di not. The valve recession must be set correctly too when the valves are gorund. Most places don't get them right. Send me a phone number as well and we can disscuss this in more detail. John