I am now in the process of finding a motor salvaged/used, does anyone know a good leak test rating on a motor? It seems some places do a compression test and what I am told is not to buy anything with compression lower than 310 with 10 between each cylinder at most. But some shops or yards are giving me a leak test and saying it is 10 to 14% meaning 90 to 86 % good. I just want to beable to convert it to a compression test and know. Does the 310 sound like a good #? thanks for all of the help