oversize valve install 4valve gs

[Big Jay]

high performance Serdi cutters will unshroud that area while machining the seat.

[4cyl h2]

high performance Serdi cutters will unshroud that area while machining the seat.

What specific area jay. The ring around the valve? Or the wall area close to the valve

[headsbikesmopars]

If you don't have the correct cutters to do the valve job right, you will HURT & REDUCE the airflow!!!
Ray.

What Ray said.

H2 I have found that having the valves back cut 37 degrees will indeed pick up low lift flow a bunch. That will get the 'moving column of air' started earlier in the lift cycle. and it is an effective and cheap mod. Much more effective than removing that 'ring' on street engines. Wedge chamber heads (Most auto) respond better with 30 degrees and hemi chambers (bike and some auto's) like 35-37 degrees better. Suzukis seem to respond best with 37 degrees, Kawasaki's like 35-36 degrees. I do all my Suzuki heads using 37 degrees. I do both sides intake as well as exhaust. There IS flow there to be gained.

Terry

[4cyl h2]

What Ray said.

H2 I have found that having the valves back cut 37 degrees will indeed pick up low lift flow a bunch. That will get the 'moving column of air' started earlier in the lift cycle. and it is an effective and cheap mod. Much more effective than removing that 'ring' on street engines. Wedge chamber heads (Most auto) respond better with 30 degrees and hemi chambers (bike and some auto's) like 35-37 degrees better. Suzukis seem to respond best with 37 degrees, Kawasaki's like 35-36 degrees. I do all my Suzuki heads using 37 degrees. I do both sides intake as well as exhaust. There IS flow there to be gained.

Terry

Thanks for the info terry. Just trying to do this the best I can. Will have to say while I'm getting the valve job done I think ok it's turning out to be a big deal doing it right. Def a job for a pro a standard reseating seemed not to bad but really opening them up and getting a good seal is difficult, while keeping a good shape

[oldgsgkd]

yeah h2, 39 years can get me a good seal, how accurate the guide holds the stone,holder how straight you are holding the stone holder while cutting the seat, apply small amount of bearing blue-then use a magnifying glass to see how good the contact mark is