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I bought a 1979 horizon jet boat with a 455 olds, 12jc-a pump. How can I tell what impeller it has, how do I know if it needs a new one, how to service the pump, and the best question of all how to go faster? My top speed was 51. I was told it has a 650 cfm carb on the 455. It has a place divator on it. Do I need a loading great? It has these little fins on each side of the boat that are flat What are they for? Sorry for all the questions I just want to fully understand my boat. Thanks for the help
 

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Give me a call and I'll help answer some of your questions for you. Answers to what you've asked is way too much to type. 417-858-8616.
 
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