When valve train clearances are going to be tight, I like to double check my measurements and bench calculations by actually testing the components after they’re assembled. I put the valves and springs in this head, then used my quill on the seat & guide machine to check that my math was correct. I touched off on the valve tip, zeroed the indicator, opened the valve to full lift, and recorded how much further I could open the valve before it hit coil bind. I like to have at least two methods of measurements on anything that is critical, or that could cause a failure point. In this case, I actually measured .010” more clearance to coil bind than I had calculated on the bench.
Jake Sampson
Sampson Race Engines
Inver Grove Heights, MN
