My builder was up front with me about what was what. Parts I supplied were my problem. Period. If I didn't want to spring for the dyno time to break in the cam etc it was guarantee'd to his front door. Period. He checks and corrects ALL parts so if it was done his way, broke in on his dyno and it stuck a valve, scuffed a piston, spun a bearing, he stands behind it 100%.
JMHO but I wouldn't build a "real" engine and not pay for the dyno time. Best money you can spend. If the valve train was really that unstable it would have shown up on a dyno with good data acquisition.
