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you probibly need to change the water pump to a newer year. there is no difference between the 400 and the 455 besides the year. if you use the pump for the 455 it should work or go to the salvage yard and get pully setup for the 455.

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โˆ™ 2011-09-14 08:37:23
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Q: You have the belt set up from a 1968 Pontiac Bonneville with a 400 engine was replaced with a 1973 Pontiac grand ville with a 455 The water pump shaft is too long and the pulleys do not line up what?
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