Yes, but hardened seats are necessary. I bought my formula S with an "already rebuilt" engine - no hardened seats. With less than 6k on the rebuild, when I removed the rocker arms the #8 exhaust valve stem stuck up 1/4"higher than the intake valves. The seat had been beat to hell and the valve would no longer seat. :-x
Hardened seats are a must... Pay me now or pay me later.... Which would you rather do??? :dontknow: