What kind of whp amounts are people getting out of the stock head? What do you guys suggest i do to build tyhe head for high hp amounts? and are there any other shops i should consider other than portflow for this?

 

What kinda cyl head is it ? I know the LS cyl heads require a decent amount of work to flow really well..... B16a and ITR cyl heads flow very good for being stock.
GSR cyl heads if i am correct have a great intake port chambers stock but could use a port and polish job on the exhaust side, But dont hold me on that....

Good Luck....

 

Yeah my bad i forgot to mention this is for a b18c1!!!