I don't know how good the stock LS lifters are but I have almost 200,000 miles on the stock roller rockers in my '99 Suburban which has the 5.7 Vortec (R motor). Granted they don't see the lift and RPM yours do but still.
For the rockers, if you went from the stock 1.7 to a 1.8 you'd see an increase of .033 for a lift of .599. Do you have the piston-to-valve clearance for that? How about the springs, will that put them coil bind?
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