Re: L78 pistons
If there is even the slightest bit of bore wear I wouldn't even consider putting one back together with OEM pistons, but that's just my opinion. Ring seal is critical to performance and longevity, and w/o honing with a torque plate (which is something the factory did not do back in the day) the cylinder walls will never be straight, round & true in operation.
Even if you tried to hone the block with a torque plate now, by the time you got the bores straight you'd have too much piston to wall clearance.
Again...just my opinion.
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