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Old 10-19-2014, 04:50 PM   #1
47 flatbed
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Default 1939 3/4 ton flathead

Trying to figure out what this engine is. Truck has 85 badges on side. Removed heads has triangle round triangle water holes. Is this a mercury block? On passenger side of block it has BBMC20247 stamped.
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Old 10-19-2014, 05:03 PM   #2
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Default Re: 1939 3/4 ton flathead

Round hole instead of keystone shape in the center is a good indication of the early 239 blocks. Mercury and trucks both used them. Someone may have changed an 85 out for a 95 at some time.
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Old 10-19-2014, 05:21 PM   #3
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Default Re: 1939 3/4 ton flathead

I have a strong feeling this is the original engine. But with many years past who knows for sure
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Old 10-19-2014, 05:22 PM   #4
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Default Re: 1939 3/4 ton flathead

Are the badges original to truck also
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Old 10-19-2014, 05:24 PM   #5
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Default Re: 1939 3/4 ton flathead

Is the crank going to be 3 3/4
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Old 10-19-2014, 11:20 PM   #6
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Default Re: 1939 3/4 ton flathead

It should be 3 3/4 stroke. Does it have 99T on the heads?
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Old 10-21-2014, 04:16 PM   #7
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Default Re: 1939 3/4 ton flathead

No 81 a heads. That's what got me started
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Old 10-21-2014, 04:25 PM   #8
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Default Re: 1939 3/4 ton flathead

First year for 3/4 ton truck.
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