where was the leaking taking place? rings? intake valve? exhaust valve? a for instance, my supercharged motor leaked 1-2% thru the rings on all but #5, it was an exhaust valve at 8%, so off came the head to have it reseated at the shop. your build sheet ring gaps are fine. if yours is leaking thru the rings at that leakage a vacuum pump is only a bandaid and you'll still have a shitty screwed up "joe Sherman" built motor. take the damn thing out and go thru it or have some one else do it.
