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not sure but i do know Pontiac changed the design of the timing covers and water pumps in 1970 for cooling purposes,on the 400.but they didnt come out with the 455 till that year i believe.i know what your talking about because i made the mistake of puting a1970 timing cover on my 68 Bonneville and i have to change it back.if the timing covers are the same you can take the one off the 400 and use that but i don't know if they are the same.

Turn the pulley around on the shaft and see if that makes things fit better.You are correct the 455 was introduced in 1970. The 11 bolt water pump was introduced in 1969 to replace the 8 bolt previous pumps. You must change the timing cover and water pump together as the earlier and later styles will not work together. You would need the water pump, timing cover from the 1968 400. -Bonn-evil

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โˆ™ 2011-09-12 13:59:03
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Q: 1968 Pontiac Bonneville with a 400 replaced with a 1973 Pontiac grand ville 455 engine The water pump shaft is too long and the pulleys do not line upwhat can you do to correct this problem?
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