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Old 05-08-2018, 07:45 PM   #1
fixitphil
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Default AA Engine

Are all AA engines Diamond Blocks? What is the difference from an A engine and a Diamond block?
Thanks,
Phil
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Old 05-09-2018, 12:06 AM   #2
Chris Haynes
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Default Re: AA Engine

Diamond blocks did not come in cars or trucks. The only difference between an A engine and a AA is the serial number starting with AA.
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Old 05-09-2018, 01:57 AM   #3
Charlie Stephens
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Default Re: AA Engine

The AA indicated the engine/transmission assembly was intended for a large (AA) truck. The engines were the same but the transmissions were different for the large trucks. The diamond blocks were post production replacement engines.

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Old 05-09-2018, 06:31 AM   #4
Ron in Quincy
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Default Re: AA Engine

The 'DIAMOND block is built with hard seats in the exhaust and the Camshaft is a ''B" Style. The A and AA blocks use standard valve seats and standard "A" camshaft.

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Old 05-09-2018, 12:06 PM   #5
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Default Re: AA Engine

Not all Diamond blocks had hard seats.
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Old 05-10-2018, 11:41 PM   #6
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Default Re: AA Engine

Why hardened seats in the '30's? All the gas was unleaded. The valves is stock blocks did well.
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Old 05-11-2018, 01:31 AM   #7
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Default Re: AA Engine

I have a diamond block in my A & it does not have hardened seats.
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Old 05-11-2018, 08:48 AM   #8
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Default Re: AA Engine

Thanks for the info Guys.
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