O1 is what had the injector problems, we have had every year between my family in friends and the only problems have been injector cups lifting on the lb7 pulling truck (~800whp) and we put a rod through the side of the block on a twin turbo stock motor lb7. Never a problem from any stock turbo lb7,lly,lbz,or lmm we have had, and all tuned to 500+whp. I would not be afraid of an 02-04.5 lbz.