2.5 crank big vs small bearing

How hard is it to fit a 2.5” non-oiler 1.5” top journal crank into a later model 280 block? Do you just use the smaller 1.5” bearing and the matching top cap in the newer block? Or is it much better to stick with a big bearing crank?

the question is why put a small bearing crank in a 280 block you can use a small bearing crank in a big bearing motor just got to put a collar on it but I would not be comfortable with a small bearing crank

Because I have one already and it looks like a new big bearing crank is around $2000 :-(

Just use it...bearings fowwle the crank.....JMO...Just don't use plastic....Sand the rings for more.... did I say that????? heeHee..

Mercury made an adapter to install small crank to big 280 block I have the part number at home dunno if they still make it !!!Ive used it lots of times ...


Jay

http://www.marineengine.com/newparts...1159-832012T+2

pretty pricey, it only adapts crankshaft with 1.5" upper journal to big bearing block

You can find good used big bearing cranks for around 800

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Originally Posted by patchesII

You can find good used big bearing cranks for around 800

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Thanks. Been looking but so far no luck. Seems like a rare item.

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Originally Posted by tripower

Thanks. Been looking but so far no luck. Seems like a rare item.

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I have sold about 10 in the last year if I get more I will let you know $650-$800 +shipping

Great, thanks!