I am looking at an rb26 cylinder head for the rb30 twin cam head conversion.
I noticed that a place can do CNC head porting on the head, here are the flow figures,
Number 1 = modded intake
Number 2 = stock intake
Number 3 = modded exhaust
Number 4 = stock exhaust
I haven't seen any other figures to compare it with, if someone has them could they please let me know so I can compare.