I would like to know about how much more HP i will get out of my quad if I port and polish the head and get a 5 angle valve job done.
My Mods are:
Pro flow foam with outer wear
dyno jet kit 185:180
Stage 2 Web Cam
Stiffer valve springs
11:1 Wiseco pistons
.5mm over bore (6-9cc's)
Big gun header
Big gun Pipe

 

There goes that five angle valve job again, thats a new one on me. Three angle valve job is three cuts on the valve seat. Clean up the bowl area, and raise and conture the roof of the intake ports as it inters the bowl area.
Same for the exhaust port, but don't go to BIG. Stay within the exhaust gasket.

Port match the intake boots to the cylinder head.

 

Someone was telling me that there is a shop that will do 5 angle valve job port and polishfor 450$

 

They don't do a 5 angle valve job on quads just race motors (cars) 3 on the seat 2 on the valve........