This weekend on track at NJMP, I broke cylinder #7 rocker and valve, head is toast, piston is toast. Time to tear down again. Literally cried after pulling the valve covers. It took an entire year to research, build, machine, this internally balanced 306. If the windsor experts can hop in here, looking for advice, since I was on gt40x heads and the driver side head is gone, its time for me to pick a real race head AFR or TF 11R, im praying the block is ok, and the rotating assembly. My plan is order 1 piston and rebuild, I need to figure out which head and maybe go to the TF box r intake...