I've found a P90 head which I would like to rebuild for a mild l28. The problem is, the cam and cam towers (plus rockers etc.) are gone!
No problem (other than core) on the cam as I was planning on a custom cam anyway, and I believe new rockers are a good idea as well, but...
WHAT can I do for cam towers? Can I pull towers from any L28? I would imagine that internally oiled cams (like the p90) would have unique oil passages, is this true? Do I need to find towers specifically from a P90 and nothing else?
Finally, I understand it would be a good idea to maintain the cam tower positions from the donor head, but is there enough variance in the machining from the factory that I'm "doomed" such that cam towers from one head will never "line up" on a different head and give a true line-bored center? If not, the aluminum towers are themselves the bearing surface, so I'm not sure if there would be any options to re-machine...
Please help, ye who are much smarter than me!