Greg: A quick an easy "rule of thumb" method is to take your assembled head, turn it upside down and fill the combustion chambers with water. If none leaks out of the intake or exhaust ports - they are likely pretty good.
No, the above method is not as good as lapping valves, as that will show you contact between the seat and the valves and where it is. If you are going to lap the valves, take a marker and put a line on a random point on the valve, extending from the center to the edge. Now put the valve in so that mark is at 12:00 position. When lapping the valve, only rotate it between about 10:00 to 2:00. Now when you pull the valve and check the marks, you'll know generally where you have poor contact (if you do).
No, the above method is not as good as lapping valves, as that will show you contact between the seat and the valves and where it is. If you are going to lap the valves, take a marker and put a line on a random point on the valve, extending from the center to the edge. Now put the valve in so that mark is at 12:00 position. When lapping the valve, only rotate it between about 10:00 to 2:00. Now when you pull the valve and check the marks, you'll know generally where you have poor contact (if you do).

















