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Mercruiser 7.4 serial numbers?

Old 08-22-2021, 08:27 AM
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Default Mercruiser 7.4 serial numbers?

Is there place where i could find out the year model with the serial number? B947354. All i can find is that it is 1988-1991, 7.4l
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Old 08-22-2021, 11:42 AM
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From merc a dealer ran
manufactured 12/23/87
registered 5/4/88
couldn't find anything on HP.
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Old 08-22-2021, 01:03 PM
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Originally Posted by PA.WOODCHUCK View Post
From merc a dealer ran
manufactured 12/23/87
registered 5/4/88
couldn't find anything on HP.
Thanks alot! Can you see where it is registered the first time? The engine is now in europe. One site claims it is 7.4 magnum 365hp.
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Old 08-22-2021, 07:27 PM
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Originally Posted by janih View Post
thanks alot! Can you see where it is registered the first time? The engine is now in europe. One site claims it is 7.4 magnum 365hp.

miami ,fl 33189
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Old 08-22-2021, 08:56 PM
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Pull your valve covers and oil pan, those era/model mercury engines have 4 bolt main, forged rotating assemblies, 990 or 188 rectangle port heads, or they don't and it's just a base model engine.
the earlier 80's engines 370 and 420 had crane gold roller rockers, i don't know if those rockers carried over to the 365 mag tho.
i'll try and find some threads and part look up link.

https://www.perfprotech.com/mercury-...gines#hp-table

same site says no results found for that serial number B947354 or OB947354

how to tell if I definately have a magnum motor

how to I.D a 454 Magnum

Mercruiser 454 serial number info

Last edited by outonsafari; 08-22-2021 at 09:25 PM.
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