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Since he was asking about a 1961 FL I only gave him a number for 74 CI as 61 CI engines ended in '52 and the crank wont fit the later cases. 61 CI engines also have a smaller bore, 3-5/16 as opposed to the 3-7/16 of a 74 CI.
If someone truly wanted to though they could build a 61 CI engine out of any pan with a little machine work and small bore cylinders. Then you would be making a dog into a lazy dog!
I must have been asleep when I read that. My brain saw 61, so I thought he was asking about an el.
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