I think bascially it comes down to this ..
Tools .. if you have the right tools (I do not have all them now) so thats another reason I choice to send it to someone else.
Money .. if you have the extra money to have someone do it, I plan for it usually every winter, this year I am not planning to have it done as I raced very little this year (100 passes) Next year will be the real test to see what it can do with 350 or so 1/4 mile passes on it.
I was once told by a old school engine builder, if it has good oil pressure, and its not smoking .. why replace any parts in the bottom end. New lifters and springs and race it !! He claimed he had took near perfect used parts out only to see new parts break (we've all seen it) this is why he does what he does ..
FYI My engine isnt a 20k engine either just runs like one :lol: