I have a Buick nailhead that came out of a 57 Buick Century but its believed to not be the original engine in the car. I need help in finding out if its a 364 or a 401. The casting # on the heads are 1172889. Are there any other tell tale signs of which this engine might be? Thanks in advance for the help. Rob
59-60 364/401 Need the casting # from in front of the valley cover to be sure which one it is. suffix should be like 3F =1959 364 or 4F =1959 401 or 3G =1960 364 or 4G =1960 401
The 57 364 had a cast iron timing cover and all 401's had an aluminum cover. This will be a clue but 364's after 58 had aluminum covers as well but it could be quick answer for you. Good Luck
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