It took a lot of time. Did it during my lunch hours at work. Heads on the frame rack and me on the stool. Always had my safety equipment on. Metal grinding can kill ya. They actually ran pretty good but i messed up in a lot of other ways. I wiped out the 273 rockers with homemade shaft shims. I was young too. I found a spot for them. Ill keep the valves and thing for another build some day. I'm really intrigued with the FAST racing class but it will never hit my area. Wont keep me from building one though.