MERC. FLATHEAD - Ford Truck Enthusiasts Forums


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Old 06-20-1999, 10:10 PM
fugates fugates is offline
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I have just acquired a (49-53)flathead marine engine that I would like to install into my 51 F1.
I am wondering if there is a lot of differences between the normal 239 and the marine engine
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Old 08-09-1999, 08:58 PM
fordman_1 fordman_1 is offline
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There is a little differnces from ford and mercury engines.The merc was a little thicker in the block around the valve seat and the cyl and they didn't crack the block as bad when you got them hot. and they had 10 more horsepower than ford.They used shaft and head. and marine had 10 to 15 more hp than car engines.In the late 60, I had woods boat with a 51 merc engines. YOU CAN PUT IT IN WITH NO PROBLEMS.
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Old 08-26-2001, 10:06 AM
Wired Wired is offline
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I got both Ford and Merc engines and I only can see a difference in the crank and was told by a reputable machine shop that if the block of the Merc is cracked to save the crank as it is a 1/4 of an inch longer throw and believe me they still crack in all the same places ( 1/4 inche throw accounts for the 10 hp increase and a cam and head change would increase it even more ). I just put a set of Edelbrock heads on one and increased the horses up 25 % ( compression ratio went from 6 1/2to 1 to a whopping 8 to 1 ) .
So as far as using this in your truck it will work and if it is fresher then you will notice a big change but if it isn't then it will be the same . Just remember that the Ford is a work truck and the Merc is just the same but dressed up .
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Old 07-22-2002, 08:08 AM
mercuryblues mercuryblues is offline
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>Yes It is really A Merc FLathead (Cast on the heads), Since
>I made the first post Ihave removed the hedas and found that
>It has a 4" stroke (Pure Merc). Did you say Hot Rod? This
>Motor is going into my 51 EFFIE!

If it has a 4" stroke its a 255cid most Mercs cars and trucks meteors and monarchs used this engine.
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Old 07-24-2002, 01:15 AM
soso soso is offline
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