Re: 637 ci
Started my 637 today. It's in a 1967 GMC ladder truck.
The 637 came out in 1966, it replaced the V-12 twin six.
Some on here don't like posts about the 637. They feel it does not fit in with the 60-66 group. I may have a shop manual on it though. Join "Stovebolt.Com", They will help you out a lot more!
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