[shinklesauto]

The heads are a great investment now they make a phase 1 and 2 bowtie head both have the same casting number both are 202 160 valves 64cc and 186 runners. the only real way to tell them apart is where the water temparature sensor goes into the head on the phase 2 it is machined flat unlike the phase ones. and yes this is the best iron cylinder head GM makes they have alot of pottential for a budget build just check out some of the flow bench charts.