Im thinking anyones jig is going to give a different reading and that includes shop to shop. We have both seen the slightest variance move the scale 10g (~1/3 oz) in either direction. Im starting to believe that the balance you get with the shops bobweight (1X4) is gonna get you close, but there is nothing short of a dynamic balance in the block that's gonna get you nuts on (at one RPM!!) ...and with under and overbalance practices and moving balance numbers throughout the RPM range...its just needs to be close. For example , there is an added 'oil assumption' value, "...Eagle uses 5g for small block assemblies and 15g for big block assemblies. (all balance shops use an estimated oil weight) Since it is impossible to accurately represent this value, it is just an estimate.." so that right there is saying 10g out of balance isnt going to make a noticeable difference. Road kill garage had a 360 assembly 'balanced' at a machine shop and they said it 'shook like a paint shaker' on the dyno. I think those guys know the difference between a neutral balance and a Detroit balance in their parts.
