I reread DV's lsa article and applying his theory to my 511 with 2.200 intake valve, 4.375 bore and 12.5:1 compression it looks to me 108-110 lobe separation should work pretty good with this combo. In fact I believe dwaynes cam should work quite well in this combo(270/276@50-110). If i ever replace it I would go 108 before I would go 112 and with faster lobes and a tad more lift.