The Stovebolt Site Forums The Parking Lot Big Bolts 70s era flywheels

So today I was told that 1970s era 427 engines made in Canada were externally balanced engines. Engines made in the US were internally balanced for the 427. I have a big flywheel from a 427 that is externally balanced. Plan on using it on a 454 with the original crankshaft. Local machine shop said they can check the balance for me. I would like to have an idea before I drop it off. Do they share the same external balancing?

Hy farms, welcome, are we talking about the tall deck 427s?

Yes. I am putting a 454 into a 1970 c50. The 454 is a 1978 engine according to the casting numbers. Having trouble balancing the assembly with the flywheel that came with the original 350. So have been looking for an externally balanced flywheel for a 454 medium duty truck. Seems the 454 medium duty trucks were only a couple of years in the early 80s. So now hoping this 70s externally balanced 427 flywheel will work for my 454.

Hy farms, what research I have been able to do indicates that the only Chevrolet V8 engines that are externally balanced are the 400 small block and the 454 big block.

Here is a pick of the casting number and the flywheel. My parts catalog only goes to 1969 and only has one part number for the 427 flywheel. So maybe it is after 1969 that they started making some externally weighted?