maximumvelocity

I have a set of well flowing heads with stock valves (1.94 and 1.5) on them. The seats have been enlarged to accommodate the larger 2.02 and 1.6 valves. The shop said they sealed just fine, but they were seating right at the edge of the valves, with a little bit of the seat visible around each valve head. He's now trying to sell me 2.02s and 1.55s. Anyone have experience with valves being pushed through their seats because they were too small for their seats?
The person running these heads before me apparently had no issues while running them n/a. I'm on a slightly tight budget here and was thinking about just leaving them as is for now.
For now I'm going to run n/a but I have a turbo in the works.
How beneficial would it be if I bumped these up to 2.02/1.55 or is 2.00/1.55 any better? I'm more interested in better throttle response than maximum top end performance. I've heard some talk about losing power and throttle response by going larger. I'm not building a race engine (for now), but I am expecting to have a 400rwhp n/a daily driver and perhaps 600ish hp boosted in the future. Stock valves up to this kind of load?

jsetzer

I went 2.02 and 1.55 and don't think it made a bit of difference. The bigger valve in our little chamber just shrouds the opening more. So its a bigger hole, but theres a bigger valve for the air to flow around coming out of that hole. If he says they will run fine with stockers run them.