Yes, the 1.94" valve gets close to the chamber wall & should do some chamber wall relief.
I recommended 1.85" valve because you do not need to do any relieving of the chamber walls, mileage or torque should not suffer.
Also, because you did not seem to want to make much power over what you currently have, & seem to be hesitant on wanting to change the camshaft.
Going to a 1.94" valve will cause mileage drop, less low end torque
I would not add lumps unless you are wanting to go into a different direction from what you originally wanted out of your current engine.
Meaning, do you want to make more power & suffer a bit in the mileage department, less low end torque, throttle response?
Bronze guides are better.
MBHD
