They are a excellent rod. Normal removal time is 400 passes. I have one set that has 450 passes on them plus another with zero runs. These are 6.5 in length and 2.200 rod end. Bob weight is very light and requires mallory with my combo. I was talking to a guy this weekend and he bought a 440 source crank that is 4.25 stroke with big block chevy rod journal with aluminum rod and J/E piston and he said they had to drill to balance this combo. If you can find them , BUY them. Don+