I have a very clean cylinder head from a Maxima for sale as is , or build to suit. If you don’t know much about these they are a very nice option for a Z motor. Small well designed combustion chambers ( approx 40cc) with a nice quench pad to help resist detonation . It has exhaust liners , but they flow great unless your building a race motor.  If you do some research you’ll find it makes a sweet little hot rod head for your block. The MN 47 head came with the bigger 35mm exhaust valves and has