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05-30-2021, 09:08 AM | #1 |
Junior Member
Join Date: May 2021
Posts: 14
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Mercury ID help
I recently acquired a Mercury flathead and would like to know the year and specs.
Here are the numbers/letters so far: Head: F L EAC C 18 3 Mercury 12 Top of rear of block: 24 39 x : 4 Intake: 8 B A 8 R T 6520 Rear intake top of right side of block: 3 C |
05-30-2021, 09:26 AM | #2 |
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Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,319
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Re: Mercury ID help
Hard to tell what you have because the head and intake contradict each other. The heads are for a '53 Mercury, but the intake is for a Ford (car or pickup). You are probably going to have to take a head or oil pan off to measure the stroke to be sure. The only thing that is really important is whether you have a 3 3/4" or 4" stroke crankshaft. Other than that, the differences are minor.
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05-30-2021, 11:09 AM | #3 |
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Join Date: Jun 2010
Location: San Antonio, Texas
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Re: Mercury ID help
If heads are original the EAC heads were 1952/53 production but they are easily replaced. Measure stroke or width across the crankshaft counterweight cheeks. Some crankshafts have casting marks with the prefix but not all. The 6.5" width across is Mercury. All of the 8BA blocks are basically the same with the exception of the valves beginning in 1951 plus the obvious crankshaft & pistons mentioned previously. Rotator valves and a larger crankshaft flange bore were late engine characteristics and also the elimination of hardened intake valve seats and exhaust valve seats on some engines. Many late engines have a 1BA casting mark down in the tappet valley area.
Last edited by rotorwrench; 05-30-2021 at 11:14 AM. |
05-30-2021, 11:32 AM | #4 |
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Join Date: May 2010
Location: East Hartford, Ct
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Re: Mercury ID help
As stated until you can determine if you have a 4" stroke, that will at least tell you that you have a Merc. crank. For now it appears you may have a Ford block with Mercury heads and possibly an 8RT truck intake.
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05-30-2021, 12:19 PM | #5 |
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Join Date: May 2010
Location: Capital of Corruption , NY
Posts: 811
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Re: Mercury ID help
Check for more markings on rear top of block. Date code. See link.
http://flatheaddrag.com/birthday |
05-30-2021, 01:51 PM | #6 |
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Join Date: May 2021
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Re: Mercury ID help
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