moper
Well-Known Member
Two things cry out at me:
1. - it was bored - meaning new pistons. It should have been rebalanced unless the pistons were factory replacements - and honestly even then if it was a performance build - it should have been balanced even if it was external using the factry balanced AND flexplate AND convertor.
2. the convertor change. If it was not balanced at all, it might shake as the rpms rise. If it was externally balanced but you replaced the factory nuetral flex plate and counterweighted convertor with a neutral convertor and counterweuighted flexplate - it should be fine.
Does the vibration get worse as the rpms rise in neutral? Rev it up to 3500 or 4K slowly. If it's trying to rattle your filling out - the engine needs to be balanced or the flex plate/convertor combo is off.
1. - it was bored - meaning new pistons. It should have been rebalanced unless the pistons were factory replacements - and honestly even then if it was a performance build - it should have been balanced even if it was external using the factry balanced AND flexplate AND convertor.
2. the convertor change. If it was not balanced at all, it might shake as the rpms rise. If it was externally balanced but you replaced the factory nuetral flex plate and counterweighted convertor with a neutral convertor and counterweuighted flexplate - it should be fine.
Does the vibration get worse as the rpms rise in neutral? Rev it up to 3500 or 4K slowly. If it's trying to rattle your filling out - the engine needs to be balanced or the flex plate/convertor combo is off.
