warrantee work
I'm with Frank. If the builder was at fault because of negligence, then he should stand by his work. I do my own motors. If a cam fails, a cam fails. I've had it happen. Even the cam manufacturer just tells you you must not have broken it in correctly. I've never gotten anything from them. Why is it OK for me to have to rebuild it myself, but paying for that labor makes the guy liable for everything. Unless you get a stated mileage/time warranty, I don't think you should expect one.
Dan