ok to run this??
Though you can a little closer, I recommend a minimum piston to valve clearance of - .080 intake and .100 exhaust.
I don't know how the LS6 heads compare.. but I know someone that milled his stock LS1 heads .050 and ran a Comp Cams 224/224 563/563 w/out a problem.... (he's one of if not the fastest NA stock cubic inch F-Bodies... i think his last run was 11.2 or so... )

