Quote:
Originally Posted by austin8214
You can safely bore a 13 fin block out to almost 4".
However as mentioned you will need to get the correct rod and piston combo. You also need to take the club rules into consideration.
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How close to 4"? 3.900"? 3.800"? 3.999999999"??
You say a 13 fin. What about the 12 fin?