Making progress on the long-rod 225 I started building last year. Gapped and installed rings last night, and tonight I started installing rod/piston assemblies in the block. These are stock 198 rods, but they appear to be a mixed set. They have all been resized by a machine shop.

I got to the third rod and found that the two bearing halves are offset by about 1/32" when assembled. It looks like the locating notch in the rod itself (not the cap) is offset slightly. The bearing shells themselves look fine; the notch location matches up with all the others I have on hand. I tried flipping the cap around, but that obviously wasn't going to work. The rod was definitely resized with the cap installed in the direction pictured below, with both notches on the same side.





I went ahead and installed the rod and torqued down the cap nuts, and the crank still spins freely by hand. Should I stop worrying about this? This engine will be seeing 5k RPM on a road course with a turbo.

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Somehow I ended up owning three 1964 slant six A-bodies. I race one of them.
Escape Velocity Racing

I'm thinking no problem and would most likely just install it, but I'll happily defer to others' knowledge...

Lou

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Home of Slant6-powered fun machines since 1988

I remember seeing a similar mismatch on the outside edges of the bearing shells when I was assembling the slant motor that is in the 83 D150.
I assumed the mismatch is due to a tolerance stack up between the notches in the rod ends and the bump outs on the bearing shells.
As long as the shells do not extend into the chamfer on the outside of big end of the rods and the oil holes line up,
I would not be concerned over it.

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Doo Ron Ron and the Duke of Earl are friends of mine.....
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