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If you're saying that the engine has been repaired with only a crank and bearings... there is no break in period necessary.

The break in procedure allows piston rings to properly seat and to a lesser degree, it allows lifters to seat to the camshaft. If you've replaced none of those items you don't have a break in concern.

Technically, when an engine is running properly, oil pressure is up and nothing is worn, the bearings never actually touch the crankshaft. The pressurized oil holds the bearings away from the crankshaft and they could theoretically last indefinitely provided that you could keep clean oil flowing.

I'd just drive it normally. That's a tough engine and if you only needed to replace the crank and bearings I'd guess it ran out of oil.

The bad news is, if it ran out of oil there is a real possibility that a rod or main journal overheated and "stretched", meaning that it may be slightly out of round. The new crankshaft and bearings could have problems if the rods weren't reconditioned and the block wasn't checked and possibly align bored.

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17y ago

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