Hi i have a db34 engine and i cant get the exhaust tappet setting below 44 thou i have checked the wear and the rise in both cams they are both the same both the push rods are the same length i bought a new exhaust valve that to was the same length as the original one the only thing that i cant check is the rocker i think someone in the past has had a go at it with a grinder does any one know where i can get another rocker that goes in a ecentric shaft rocker box or where i can get the old one built up. I have heard the name stellite welding banded about does any one know about this thanks for any answers Tony