AA Engine
 

Are all AA engines Diamond Blocks? What is the difference from an A engine and a Diamond block?
Thanks,
Phil

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.

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.

Charlie Stephens

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.

Ron

Re: AA Engine
 

Not all Diamond blocks had hard seats.

Re: AA Engine
 

Why hardened seats in the '30's? All the gas was unleaded. The valves is stock blocks did well.

Re: AA Engine
 

I have a diamond block in my A & it does not have hardened seats.

Re: AA Engine
 

Thanks for the info Guys.