I have seen people talk about Leak Down and compression test for a while, but now since im buying a motor from japan (Hmotoronline), I wanna make sure that I am making a good decision. What should the compression come out to be?190?

About the leakdown, please explain that to me. What are your opinions on buying JDM motors? Even with 35k miles on the motor, couldnt it still be bad if it was stomp and whomped on? I may not get one from Hmotors because there is a shop here that sells motors strait from Japan for real cheap, and I know the guy, so Labor will not be too much. I did business with him before with my transmission for my civic and he did a good job. He also gives a 6 Months, 6000k miles Warranty on all engine and transmission.

Well this post has already gone way OT, but I basically just want to know:

1)What is a leakdown test?

2)Should I get a JDM motor?