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Thunderbolt 500 Distributor

RnTMotorsports

New member
I am trying to find out if the distributor off a 85 horse mercury will work on my thunderbolt 500. They both look Identical except the caps. Mine has 4 bolt and the 85 clamps on. reason for the change is cost. Also what is the difference between a 393 2955 and a 393 2955A2 distributor cap.
 
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