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Concerning question #1, what is the duration @ .050 lift and do you you know the lobe separation? Those are the parameters that most influence the ECM. I ran a Crane that was 210 deg. intake and 218 exhaust with 116 deg. lobe separation, and it ran great with the stock ECM tune in my 05 LS2. In fact I'm presently pulling it out and it's for sale if you'd have any interest. I'm going larger with ECM tuning involved. If you have a lot of miles you may want to stick some dowels in the lifter galleries, but my swap worked well without them @ 10k miles. Now I've got over 30k miles and I'll probably use the dowels this time through for safety, because if a lifter drops down the intake and the cylinder head has to come off to access the darn lifters! Other things to consider while you're in there would be a new timing set and doing a little work to the stock oil pump. A little blending of the inlet and outlet of the pump along with a shim in the pressure relief helps out. Good Luck with your swap!
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