Main/Rod Bearings for Stroker

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Ivoryk3ys78

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Good evening.

This is for a 360/408 with a Eagle Crank and Scat I beam rods.

We got the block back from the machine shop and have started assembly. Tnen I came across something saying I need narrow baarings.

I called the machine shop and he told me that that is usually just on forged cranks and that Cast are typically full radius.

I have Cleavite 77 P series full grove and P series rod bearings.

He told me that if I do need narrow I would go to the H series bearings.


I did some searching on here and it seemed I do need narrow but from what he said on Forged cranks I wanted to double check before having to buy new bearings.


Thanks
 
Snap a bearing in the Rod or Rod cap and set it against the journal. You should be able to slide the Rod against the crank and the bearing not ride up on the radius of the fillet of the journal. If it does, you can narrow the bearings or buy narrow bearings.

Same with the mains. Snap a bearing in the cap and slide it up to the edge of the main journal and LOOK and verify if the bearing is riding up on the radius of the fillet just like the Rod throw.

If it clears you're golden. If not, narrow the bearings or get narrow bearings.
 
Perfect thanks a lot will check that. I went through my order history on summit and it does show right there for the Eagle crank that narrow bearings are not required.
 
Product description of a Eagle Forged crank...says...

Each crankshaft has cross-drilled and chamfered oil holes for improved oiling, a .125 in. radius on rod and main journals for increased strength

Product description of Eagle Cast steel

These cast steel crankshafts for feature .092 radii on the rod, main journals, a rear seal, and a snout for increased strength.

Check it out........
 
What is the purpose of half Groove and not full Groove all the way around?..
 
Stock Mopar has 'rolled fillets" don't need no stinking radius
the high pressure really increases the strength
remember "there is no strain in strength"
Jpar
the half shell provides better crank support
the full grove provides 360 rod feed without "cross drilling" the crank
Lots of improvement in oiling theory since the BBM and SBM were desighned
right Yellow Rose
some claim improper cross drilling starves the rods due to centrifugual force
me I'd check out how the LS or 3rd gen hemi or other late engines do it
 
Narrow main full groove...Clevite MS 1266HG
narrow rod bearing.....Clevite CB 481HN

King Bearing makes a narrowed rod bearing but not a narrowed main bearing...

FYI
 
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