Can Someone Please Explain "Blue Printed" Heads?

zed1015 wrote:

zukdave wrote: a three angle valve job would be a waste
of your money..

A three angle valve cut IS standard .
Usually 30, 45 and 60 degree cuts to get the required seat width,
Anyone pushing three angle valve jobs as something special or a performance mod is talking bollocks.

+1 Here's what the KZ650 Kawasaki Service Manual shows:

These were used in 87 when I put them in. It's a wonder they worked at a;;. The inner ones were rubbing on the outer ones.
Steve







I couldn't get the last one apart. $65? No brainer.

Thank you for your input, everybody! You've given me a lot to think about, and you've definitely helped to make my thought process a little more streamlined.

Ed - thanks especially for taking the time to post all of those images.

I think I'll stick with the three-angle grind, and hold out 'til I win the lottery before really putting some cash into this thing. Thanks again!