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My friend just got a 77 460 from a lincoln. He needs a flywheel for it. I guess there is a difference in flywheels depending on balancing. How can you determine if its an internal or external. balanced engine.
If it is a 77 it should be internal. Look at the spacer behind the harmonic balancer. If it is smooth the motor is internal balanced. If it has a big hatchet looking weight on it the motor is external balance.