Light valve + light retainter/lock + light spring = lower spring pressure. For instance look at the springs specced for modern stuff with, say a .750 lift cam compared to the drag racing section. Take 50g off the intake valve using Ti valves and 100g using an ovate spring and spring pressure requirements drop. At least that is what I am hearing from vendors for the N/A applications. FWIW the cam grinders are insisting we keep the big spring pressure (250/770) with the n20.

Does this engine have Ti valves on bith jntake and exhaust?