UBV head porting
Posted: Fri Feb 13, 2009 3:44 pm
I started the futur pair of heads for F5000 project.
First : exhaust port.
1) valve guide boss removed
2) exhaust port opened to 39mm/28mm
3) exhaust port track enlarged as straight as possible
Standard :
Opened for 1.5'' valve :
First : exhaust port.
1) valve guide boss removed
2) exhaust port opened to 39mm/28mm
3) exhaust port track enlarged as straight as possible
Standard :
Opened for 1.5'' valve :
