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- HSV VS Senator, VX Calais II L67
I think "shouldn't" is the appropriate term. People have been doing top swaps for years, how many do you think took the rotating assemblies out to be balanced? How good is the factory balance tolerances?One thing not mentioned is that the L67 is externally balanced.
So you can't just bung on a L67 balancer as it will throw the balance off.
Both the ecotec and L67 are externally balanced. The L67 balance weights are different because of the heavier pistons/rods used.
You might notice a vibration you didn't have before or you might not.