It will depend on who handles your crank. Most of the time it's easier to source another crank and in all honesty I should've held out to do the same, but the shop I took my engine into were competent enough to repair the crank. The bearings don't fail due to the surrounding block but have failed from a combination of wear and/or an oiling failure under normal circumstances. I am in agreeance with BradMph - your compression is more than acceptable and mechanical flat tappet heads on G63B engines (as with any adjustable flat tappet type OHC head) are noisy if not adjusted up. p.s. I haven't assembled my engine yet as I'm holding out on locating decent rockers and rails for my head