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Which ATI damper fits my 418W?

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Bolt number is dependent on the crank pulley you are using.  If its original pulleys it should be 3 bolt (confirm by looking at your own pulley), as 70 and after used 4 bolt pulley. You should also verify the imbalance of your crank (28oz, 51oz, or 0oz).  The stock is 28oz, but with aftermarket cranks it isn't always stock.  The 51oz is late model imbalance and not likely yours, but some performance builds convert to 0oz imbalance. The flywheel imbalance would also have to match the crank and dampener imbalance, so to go away from 28oz imbalance requires a different flywheel too.

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