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477 or 534?

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Old 05-28-2008, 02:47 PM
jbh174 jbh174 is offline
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477 or 534?

I am searching for a way to distinguish exactly what engine is in my 1969 F-100 Super Duty single axle dump truck. For the many years I have owned the truck I was under the impression it had the 534 CID engine. However, the carb has been giving me issues lately and upon researching the holly numbers (List# - 6284) it claims to be for a 477 CID engine. The carb could have been replaced at some point in the trucks history, but I would still like to confirm what engine the truck has for future parts inquires. How can I find this information?, I believe the engine to have never been out of the truck but I can't be 100% sure. Thanks in advance.
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Old 05-29-2008, 01:00 AM
85e150six4mtod 85e150six4mtod is offline
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Shorter stroke in 477, enough that you can probably measure using a wire or small dowel through a plug hole:

Quote from another post here:

"""You asked for it, from the Motors Truck Repair manual (C) 1979.

'66-72 477 - 4.5 x 3.75" 7.5:1 4 bbl carb HP:253@3400, TRQ:415@2300
'66-72 534 - 4.5 x 4.2" 7.5:1 4bbl HP:266@3200 TRQ:481@1700

In '73, they went down to 7.2 (477) and 7.3 (534) compression and the numbers went way down because of "net" hp/trq. In '75, there is a 475, same bore/stroke as the 477. The 475/477/534 were used up until '79, the end of my book.

Quick edit: there was a 2bbl 477, early on, in '66/'67, with HP:231@3400 and TRQ:412@1600 """

Which was from this thread:

http://www.ford-trucks.com/forums/17...ial-555-a.html

Somewhere here are all the bore/stroke specs + more for the 401/477/534.
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