A full good home brewed porting effort and 2.02x 1.60 valves creates a strong high performance cylinder head
from these stock chevy cast TPI heads. Capable of 400+HP.
Short of the vortec (062-906) and aluminum ZZ4 // TPI cousin heads (113) These are the 3rd best late head GM made.
They end up equal or better than the old Camel back heads when equally fully ported.
A small half effort will get you a small half result.