Picked up a set of Screamin Eagle evo heads. I want to run a T-man 625. I am checking my valve to valve clearance and I need to sink the valves. Sinking the valve is going to raise the valve protrusion. What is the maximum Valve protrusion allowed? Will I need to use a shorter valve if I exceed valve protrusion limit? I also read about front cutting the valves to get added valve to valve clearance. At what angle would you face cut the valves. thanks for any help.
some times cut relief deeper into the pistons how much do you need ?
Quote from: hdbikedoc on March 16, 2019, 12:54:49 PM
some times cut relief deeper into the pistons how much do you need ?
That will have nothing to do with "valve to valve".
WFOLarry is your friend, contact him.
Search for valve protrusion in this section, been discussed.
You can sink them. Up to 2.070 and even higher is possible as long as everything else is right. Will be fine but it takes a lot of work to bring back the flow and now your chamber volume is bigger and compression was lost. Tmans stock TC bathtub heads years ago were ~92cc IIRC. If I was doing the job I would just get them clear, V to V, then adjust the protrusion by a small top cut or a custom valve, if needed to get the geometry right.