cubicinches

The Clevite MS1748P is only oversize on 1-4. The thrust uses std housing bore... It's kinda goofy that they do it that way... It's got a standard thrust width, but it's not available in std shaft size... only .010 and .020. OP made the comment that his mains were std, that's why I stated he'd have to grind the mains .010.

See page 402, line 108:

http://www.mahle-aftermarket.com/C125790900540AC0/vwContentByUNID/58A5032D3003098AC12579AB00615520/$FILE/EB-10-07.pdf


At any rate, It's not gonna work for him anyway, as all five bores are +.020. Like you guys said, I do believe King makes the set he needs.

Panther

Good info, thanks for posting!

Gimme Fuel

I just can't believe that this isn't a common way to fix this problem with oversize bearings. It is the solution for turned cranks, why not for the more expensive to replace part, the mains? .020 is not a whole lot to have to thicken a bearing.......

I did find that King makes a set....but not in their performance series bearings.

MB5274SI it is an Allecular Silicon bearing. Is this strong enough for a 600 hp marine application? King's web catalog sucks by the way.

BillK

King MB5274SI is probably what you will have to use. I would not be afraid of using those bearings as long as you are not making outlandish HP. Also, depending on which crankshaft you are using, you might have to put a chamfer on the bearings to clear the radius on the crank.

BillK

Boy, that is really strange that Clevite does it that way. Would pretty much mean that the block would have to be align bored and not honed to finish size.

Gimme Fuel

King just responded to my custom bearing request........500 minimum order. Anybody need over-sized bearings?

Going to give Odessa Babbit a call......they claim they can make any bearing.

Gimme Fuel

What is considered OUTLANDISH? Talking under 650 hp here....but heavy throttle handed driver

cubicinches

Exactly... Doesn't make much sense.

cubicinches

Do they consider that a custom bearing? It's in their catalog.

BillK

I know of a couple that have been modified to at least that horsepower level and are using the "normal" King bearings.

I am almost certain that the last couple of 502's that I have worked on had King bearings in them from the factory. They were both "freshen up" deals and did not need the crankshafts reground so I wanted to put the same exact bearings back in them that came out. After a bunch of measuring and comparing, I pretty much came to the conclusion that the oem bearings were King. After looking at bearings for 25 years you sort of get to know which is which, they all have thier tell tail characteristics even without part numbers.

I think that those bearings would work just fine if they are run with the proper clearance etc. Unfortunately for you, the machine work has already been done so you will have to live with whatever clearance you end up with unless . . .

What I would do is get the King bearings but in .010" undersize. Then you can bolt them together and measure them and have the crankshaft reground to give you the clearance you want to run.

Your other choice is to get the King bearings for your standard crank and see what you have, but if it isnt right you will be stuck with those bearings.

Not sure what other choices you really have