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Oversize Pistons


ArcticFoxCJ

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So I just got my L28 block back and the 2 things I need are an oil gallery screen that apparently disintegrated, and oversize pistons because it was bored .50mm over.

I found a set of pistons that are .020" oversize, and I just wanted to do a sanity check... .5mm equates to 0.01968504 in, so I feel safe buying these.  Does anyone know of any gotchas I should be worried about?

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The math is correct.  That's about all that can be gleaned from your post. 

You'll want to match the pistons to the heads, not the block, to get the desired CR.  The L28 was used for small and large combustion chamber heads, the pistons were changed to achieve the desired CR.

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These are new.  (Do pistons normally come with wrist pins?  Can't seem to find those.)  

The cylinders have already been bored.  Which is fine because the pistons I found don't seem to go higher than .020 from that supplier.

They're dished pistons, and I'm still using the original head so that's good to go.

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17 hours ago, ArcticFoxCJ said:

So I just got my L28 block back and the 2 things I need are an oil gallery screen that apparently disintegrated, and oversize pistons because it was bored .50mm over.

I found a set of pistons that are .020" oversize, and I just wanted to do a sanity check... .5mm equates to 0.01968504 in, so I feel safe buying these.  Does anyone know of any gotchas I should be worried about?

Whenever I have had engine block work done, I have given the machine shop the cylinder block, complete rotating assembly (crankshaft, connecting rods, damper pulley, flywheel and clutch cover). The machinist sourced and fitted the pistons. 

The machinist and I had a clear understanding of what I wanted, including the piston configuration.

I was given everything after the work was completed, including rings and bearings, and prior to assembly I checked bearing clearances and ring end gaps.

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Looks like it's a moot point.  Nobody's got 'em.  The place where I thought I'd be buying them from is out of stock indefinitely.  According to California Datsun, it's been 6 months since they last got any in, with no idea when there will be more.

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