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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

engine swap

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Old Nov 17, 2004 | 11:56 AM
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engine swap

I have a 80 f-150 with a 302 and a c-6
and i want to put a 351 out of a 81 ltd
will every thing bolt up? what will have to be changed?

thanks jason
 
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Old Nov 17, 2004 | 12:01 PM
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351 m or 351 w? You'll have more luck with the 351w. The M block will need a different transmission.
 
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Old Nov 17, 2004 | 12:08 PM
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i just heard about the car and im not sure which one it is
what is a easy way to find out the difference?
 
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Old Nov 17, 2004 | 12:32 PM
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The w block will be similar sized to your 302. The M block is substantially bigger. If the car is relatively clean, it should be stickered on the air cleaner or valve cover. Worst case, ask the owner.
 
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Old Nov 17, 2004 | 12:39 PM
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I don't think they used the 351M in passenger vehicles especially after 1980.
I have seen a 1977 LTD w/ the 351M. Those were big cars though.
 
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Old Nov 17, 2004 | 01:51 PM
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Look at where the thermostat housing connects to the motor. On a 351W the thermostat housing connects to the intake. On a 351M the thermostat housing connects to the motor block because no water flows through the intake on a 351M.
 
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Old Nov 18, 2004 | 11:40 AM
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it's a 351 w
 
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Old Nov 18, 2004 | 12:10 PM
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If its a 351w then the motor will bolt to the trans and engine mounts. Because the 351 is a taller wider block than the 302 then you need the brackets for the alternator power steering AC from the 351 motor.
 
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Old Nov 18, 2004 | 01:20 PM
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Will the exhaust have to be altered any to fit the 351?
i had to true dual exhaust on the 302.
And what about would the horsepower difference be the 351 was just rebuilt and has a police intercuptor cam and crank bored .30 over
 
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Old Nov 18, 2004 | 02:11 PM
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Don't know for sure about the exhaust, but the 351 is wider at the top where the exhaust manifolds bolt on due to the taller block. If you have X pipes or crossover pipes then they might not be wide enough without alteration.
 
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Old Nov 18, 2004 | 04:55 PM
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the exhaust will be probably an inch off... I think the 351 is 2inches wider...
 
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