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1977 Highboy engine question

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Old May 25, 2023 | 02:34 PM
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1977 Highboy engine question

I bought a 1977 F250 4x4 Ranger XLT

It came with what the guy said is a 390, definitely an FE (ribbed block) 68-352 cast into head.

the vin has H designated for the engine- mfg date is 12/76, according to the chart for decoding the vin it would be a 351m correct? It says the 390 did not come as an option from the factory on 4 wheel drive? Trying to figure out if the engine was swapped in at some point or what… motor mounts and everything look factory wouldn’t they be different?

this truck has A/C power disk brakes and steering along with the manual 4 speed and the newer style (no big knuckle) front end.
 
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Old May 25, 2023 | 02:44 PM
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How many bolts holding the valve covers?

Does the intake manifold extend under the valve covers?

As OEM, no 390s in 4x4s.

 
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Old May 25, 2023 | 03:16 PM
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Intake extends under the valve covers… ok guessing this engine was swapped in. 👍🏻 Thank you.

is the flywheel interchangeable by chance for FE and the 351/400m series engines?

The plan is to put my solid 2wd 77 body on it- it has a great running 351m with an auto.

id just have to find the right bell-housing. I’m going to restore the running gear first before moving anything around.



 
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Old May 25, 2023 | 08:52 PM
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The FE is an upgrade, if it's in decent shape I'd leave it.
 
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Old May 26, 2023 | 09:18 AM
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Originally Posted by hollywoodtuck
Intake extends under the valve covers… ok guessing this engine was swapped in. 👍🏻 Thank you.

is the flywheel interchangeable by chance for FE and the 351/400m series engines?

The plan is to put my solid 2wd 77 body on it- it has a great running 351m with an auto.

id just have to find the right bell-housing. I’m going to restore the running gear first before moving anything around.
No, flywheels will not interchange between the two.
 
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