Tap rod bearings into shape??

[sjaakslinger]

I got .010 undersize rod bearings for the 36 LB engine we're rebuilding/having rebuild. Part 48-6211-C. (.010 under, STD on the rod)

The rebuilder says they don't fit the rods. Neither of them. Seems odd to me. Parts are NOS. I suppose 1 set could be mixed up at some point the last 70 yrs, but all 4...

In the Flathead Rebuild book I read it's common to tap them into shape. When I mentionned this to my rebuilder, his eyes almost popped out. [emoji28] They've done 1 or 2 newer Flatheads before, but they rebuild for a wide variety of cars, mainly top notch stuff (Ferrari, Maserati, etc.)

Is it really common practice to tap those bearings into shape? Do they really get a bit misformed from laying on a shell all those years?

Thanks.

Dennis


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