1. 

   hollowpoint Member

   Can you use the 430 big port heads on a 400 or are the valves too big?

    

   hollowpoint, May 31, 2004

   #1
2. 

   MPRY1 Gear Banger

   Buick didn't increase the valve size until 1970, so If they are stock size valve, big port heads you should be fine since a 430 and 400 ran identical valve sizes.

    

   MPRY1, May 31, 2004

   #2

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