Here is my dilemma, I have both and am getting ready to a rebuild. I know the level 20 is a stock block and it can be level 10,000000, but its still stock. Who has the level 20 and what are you getting out of it. Has anybody on here put the claims to the test? I picked it up for a good price and basically bought it because the machine work was already done and at the time I didnt think I had the 4 weeks for the machine shop to get mine done. Boy was I wrong!!:OT: I got the time now, just no funds!!