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| Flair Birds [1964-1966] You have a Fourth Generation Bird or just have some questions about them? Then this forum is for you, check it out. |
This is a discussion on crankshaft journals within the Flair Birds [1964-1966] forums, part of the Thunderbird Model Years category; I have a 390 engine out of a 1966 Ford Thunderbird. The engine was rebuilt and there is a tag ...
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07-18-2015, 03:47 PM
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crankshaft journals
I have a 390 engine out of a 1966 Ford Thunderbird. The engine was rebuilt and there is a tag indicating the rod and mains were ground down to .020 under. I have the engine torn apart and plan to mic. the journals to see if they are still within specifications. Problem is can't find the specifications for a 390 crank that has been ground down .020. Anyone know the journal sizes so I can check it with a micrometer?
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07-19-2015, 09:36 AM
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I have the stock specs at work someplace, I will look tomorrow but if you have the standard spec just knock off the .020. The tolerances don't change. If you are close to the plastigage stage look for .001 to .0015 (the latter being a safer bet for all conditions) bearing in mind plastigage is a good guide but not totally acurate.
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Dons Bird
