Lot of work messing with an NS crank.
Nothing available to re-build, but i guess if you're putting stroked rods in, seals and bearings are the least of your worries?
TZR 3XV rods fit a treat as a stock substitute.
Makes you wonder about the barrels?
As Sheppherd does a 500 overbore, the real benefit is in modern barrels I guess?
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