one thing I know .. you can always tell an engine with a good valve job!! when you crank it.. it " Pops " off instantly.......... I have seen an engine with 1 valve barely tweaked / bent , and it kills the vaccume on start up... also , if your cyls are round cold they should be round when hot. how do you bore an engine at the exact temp. it will run at ?? if your pressures are close to the same across, you have what you have. a leak down test shows how efficient your valves- and - rings are at holding their seal.. that is a sure way to see if quality is in your build...