I have a crappy S60 big valve G head here......so I finally decided to do something with it....I sent it to a machine shop to have them install the BIG valves (44mm and 36.8mm????) into my stock G head....
so I have a couple questions here...
are the S60 big valves backcut?? if not what degrees should I have them cut too....
also since the G head has lower compression, is it best to bring back the compression up to swirl head?? if so, what should I have them get it CC'd too...
ive always used the MP headgaskets....heard they are .030" bigger?? should I get the head milled for that too??
The head is going to get a mild clean up, and he is gonna flow bench it for me afterwards, and compare it to the S60 flow #s...
does anyone have the flow #s for a stock G head, and a S60 big valve head? just to make sure im not gettin BS'd here if he cant supply me with the bench #s for the S60 head
thanx,
Cory