Thread: 410 in a '74 F-100

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I need someone to set me straight on something, the motor in my 74 says 390 on the air cleaner but when I took it in to be overhauled a few years ago, the mechanic told me it was a merc 410 right out of the factory. Is this true?

Hi. The only 410 references I've been able to find are for '66-'67 Mercury. The 390 as such was supposed to end in about 1976 for the pickups, so that's the most likely thing.

The 410 is a 390 bore (4.05), with a 428 crankshaft, giving it the longer stroke and more displacement. The cranks will usually have 1U or 1UA on one of the counterweights.

Hopefully DennyW will jump in here - he's very knowledgeable on the 410 engines and can straighten out my errors.

Thanks for your help guys.

Hello everybody. How can you push a 410 over 500 HP at the wheels? I am just starting to put a little work into mine and would like to do so. Thanks