I've built several SBFs in my life, but this is not one of them. Everything I had built before was a mild performance hop up with a stock bottom end. This was a high dolllar, high performance engine I didn't trust myself to do. My mistake. I only made two runs on a road course and bent 6 of the intake pushrods when making a pass and revving the engine well over my intended 6k limit. Now here is the kicker: there is absolutley no evidence of any valve hitting any piston! I used a custom grind reduced base circle Comp cam, OEM used hyd roller lifters, the stock springs on the AFR 205 heads, 1.6 Comp magnum roller rockers, and what was supposed to be hardend pushrods. They are stock small Chevy lengths. They are cheap 5/16s tubes with pressed in balls. Most of the balls came out of the ones that bent. Since there is no evidence of physical contact, my question is this; is it possible that the pushrods were simply not strong enough to handle the revs? Has anyone else ever had this happen to them? My engine revved like crazy for a big 4" stroke, due to the aluminum flywheel.