Just wondering if crank walk is very common with these. I changed my previous short block due to 250k and crank walk before I got a BL in 2006. The current block has only 60k and recently had to go in for beginning crank walk. I don't race it at the track, but will boost on the highways and sometimes from a light. I only have a Precision 6265 pushing 15~18 lbs that was put on in 2010. Is this common, and what can be done to prevent this?