Attention: TDR Forum Junkies 
I have been thinking (oops this cant be good)
Has anyone had a head ported and lost power?
The Stock ISB head needs help, but the swirl port design really helps throttle responce. But, it is possible to loose swirl with poor porting.
While at PDR, I brought up Extrude Hone when talking with the Porting Guru, and shoot, you would have thought I shot his dog!!!
Here are my thoughts.
The exhaust side is not too bad to get too, but the intake sucks. To fully get to the intake, some people hack off the inlet plenum, and fab a new one from aluminum.
Has anyone done a mild gasket match on the exhaust side, opened up the bowls for both the intake and exhaust ports, then sent the head off for port matching with an extrude hone machine (to keep port flow equal thus keeping swirl maximized)
Has anyone had a head ported and lost power?
The Stock ISB head needs help, but the swirl port design really helps throttle responce. But, it is possible to loose swirl with poor porting.
While at PDR, I brought up Extrude Hone when talking with the Porting Guru, and shoot, you would have thought I shot his dog!!!
Here are my thoughts.
The exhaust side is not too bad to get too, but the intake sucks. To fully get to the intake, some people hack off the inlet plenum, and fab a new one from aluminum.
Has anyone done a mild gasket match on the exhaust side, opened up the bowls for both the intake and exhaust ports, then sent the head off for port matching with an extrude hone machine (to keep port flow equal thus keeping swirl maximized)
