I am getting the valves done on my 1994 lt1 and i was woundering if the stock valve guides will work with these valves or do i halfto buy new ones?they are stock length and diameter Of .3415 (11/32) 2.02 And Exhaust 1.600

 

If replacing valves you probably want to go longer to let you get enough spring in to use some real lift.

Then there is the fact that to properly utilize valves that size in these heads you should have new seats installed and even then based on RESULTS they seem to be worth nothing over the 2.00/1.56 valves that do fit the stock seats.

So I wouldn't use those if they were free.