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Jack.Stew48 I agree that checking while the trans is not installed and adjusting the position of the flywheel is the best option if one has it. Hopefully that would take place when the engine mounts were brand new also....
It is a bottom line test which neutralizes ( no pun intended ) many of the potential variables extant... which can be either cumulative or in various self cancelling configurations.
It is akin to the old style balancing of tires by spinning the wheel and finding the needed weights to add with the old Hunter equipment which clamps onto the wheel.... the brake hubs and the rim and the tire can be adding to each other's out of balance.. or partly cancelling each other .... when using that system it was then important to mark the studs so the tire could be remounted at the same orientation if it had to come off.
Trying to match the auto flywheel with a manual flywheel without the inclusion of the front half of the torque converter seems short sighted to me... then sometimes adding the less than perfect situation of using a 240 flywheel on a 300 engine does complicate procedures....
Really smooth real life usage of the car may not be able to be tested since testing without the manual trans ( which may have a vibration damper attached from the factory ) and is also an indicator that the factory knew of some inherent vibration which it tried to suppress by adding that vibration damper to the manual transmission... The fluid coupling ( torque converter ) isolated the rest of the drive train from this inherent vibration.
Someone mentioned ' external balancers'... the one at the front of the engine should be checked when dealing with these issues....
For people putting their own engines together.... it is possible with old fashioned (cheap) self made tools to get pretty much perfect equality between the weights of the pistons,rods, bolts if one has patience....it is static and not dynamic... but it is simple and straight forward.. making a balance beam and comparing them.... using the FSM to take off weight at the appropriate places with a file.
It does not require taking the crank out of the engine...only the pistons and rods... and as such would be perfect to combine with new cylinder sleeves and rings of course...
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