Like a virgin, first time valve grind. Manual says a light lap after seat cutting. I have coarse and fine oil based lapping paste. New valves. I am trying to get an even abraded band without any lines. Then I go to smooth it with the fine 360?
There is a guy on youtubby who goes to 1000 grit. But I can't see with heat expansion it would make much difference to the seal. The valves are going to go up and down for millions of times. Do I assume wrong?
Also my precups got skimmed with the head at the head shop. Being from stainless the pre cups look like they grabbed a little differently to the cast iron when decked. It is flush. Has anyone seen precups come out like this after decking before?
I read that some shops deck first, then install pre cups, then deck again.
Hard to take a photo of these details.
There is a guy on youtubby who goes to 1000 grit. But I can't see with heat expansion it would make much difference to the seal. The valves are going to go up and down for millions of times. Do I assume wrong?
Also my precups got skimmed with the head at the head shop. Being from stainless the pre cups look like they grabbed a little differently to the cast iron when decked. It is flush. Has anyone seen precups come out like this after decking before?
I read that some shops deck first, then install pre cups, then deck again.
Hard to take a photo of these details.