the only problem with big valves in inline heads is shrouding around the valve. a 1.94 valve is very shrouded and should really get unshrowded to benefit the motor. that is alot of work. also with a 1.94 valve there is a ton of port work needed to really let it work well.
it really boils down to how much work/money you want to put into your head.
i have also never seen a 1.94 valve hit water. tom
