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Hi,

can you please help to ID the 455 crankshaft main bearing size. Are those nominal size ? Or ? I was googling for the visible numbers, but no luck for me .... The numbers are stamped on the same single bearing. Thanks for any info.

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those should be standard size. Oversize will be marked .010 or similar.  Mic the journals, regardless. 455's are clearance specific, get it right the first time. Good luck!

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9 hours ago, DualQuadDave said:

those should be standard size. Oversize will be marked .010 or similar.  Mic the journals, regardless. 455's are clearance specific, get it right the first time. Good luck! 

I was thinking so - yes I will mic the shaft. Thank you Dave. Looks like the whole engine is still from the factory - i haven't seen the front crankshaft seal rope type for a while !

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Anytime you find factory bearings these days is a good thing. Make sure you read up on the oiling mods and everything else needed for a 455.  They make good power, but you have to fix a ton of factory mistakes in them.

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