I am in the process of doing a leak down test. at first i had problems with the tester i jerry rigged up but i think ive gotten that leak proof. then i had problems with getting the exaust port air tight, once again i think i got that problem straightened out but im not sure. i had a couple small leaks on the case so i brushed some case bond over the leaks. its holding air a whole lot better than when i first started the process. its loosing about 1 psi every couple mins. im really hoping its not the seals as i do not wanna tear half the motor apart again. i guess what im asking is that iv any of u guys have had a leaky seal with the test about how much air does it usually loose in what time frame. im kind of just hoping that my exahust port is not 100% tight.