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1961 - 1966 F-100 & Larger F-Series Trucks Discuss the Slick Sixties Ford Truck

1966 F100 Engine code de-code

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Old Apr 11, 2022 | 02:00 PM
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1966 F100 Engine code de-code

Hi folks,
I am new to this site.
I have a 1966 F100. The VIN plate is F10AN802005 which I believe indicates a 240 cid In-line 6-cylinder motor. The previous owner insisted that the truck had a 300 cid in-line 6. The stamping on the motor block is 05AE-6015-F and 5D20 -- does this engine code identify the motor size?

 
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Old Apr 11, 2022 | 03:07 PM
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802005 is early January 1966. The 5D20 is April 20th, 1965. Engine date code is likely too old to be the one that came in the truck. The C5AE-6015-F is common between the 240 and 300 so that won't help. But, measure the stoke through a spark plug hole using a dowel marked at top dead center and bottom dead center. 240 is 3.18 and 300 is 3.98. Should be easy to tell which it is.
 
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Old Apr 12, 2022 | 07:54 AM
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Thanks TA455HO. I don't have the engine torn apart, so I will not be able to measure TDC and BDC.
 
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Old Apr 12, 2022 | 07:58 AM
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Use a dowel or coat hanger in the spark plug hole. No need to rear engine down.
 
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