Is it possible to go from a 2.04 back to stock? I really dont want to cut valve reliefs in my pistons.

 

Yes it is. I'd do some more research and look into a different set of heads if you are dead set on the MS3 (from your other posts). The stock valved CNC LS6 heads flow over 300 and will fit a TRex without flycutting (not to mention they cost about a grand!). Or, keep the heads you have now and look for a different cam. I'm not sure about fitment issues with the 2.04 valves but with the 2.02's I had in my 5.3s you could fit the Torquer 2 or similar. However, I think the 2.04 valves are a little to big IMO.