valve protrusion

[evofatboy]

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.

[hdbikedoc]

some times cut relief deeper into the pistons how much do you need ?

[koko3052]

some times cut relief deeper into the pistons how much do you need ?

That will have nothing to do with "valve to valve".

[Deye76]

WFOLarry is your friend, contact him.

[Ohio HD]

Search for valve protrusion in this section, been discussed.

[Don D]

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.