im doing a 20/22r hybrid and half the people i talk to say i can use 22r valves if i grind the seats deeper (22r valves are shorter) and the other half say thats impossible, i looked around on google all morning and have seen people saying they have done this, is it possible?

 

Use the 20r valves... 22r cam/rocker arms... Why use the 22r Valves? Are the 20r valves burned up?

 

Ok it is tricky but I had stock 22r valves machined in to fit on my 20r head. 22r valves are still bigger than most 20r O/S valves. The big problem comes down to finding the correct springs to run with you Cam lift. The guy who did the work on my head measuring it all out with my .440 cam lift and only found 1 set of springs that would work and the made by Crane. Took him a good couple of weeks to order them in.
Hope that helped

 

call this guy he is out of oregon and can answer all your questions
http://www.engnbldr.com/