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Re: Numbers Stamped on Pistons: Factory of Rebuild

I am rebuilding my 83 and the pistons are original, I do knot that, and they have a 3 stamped in the top. I do not have a 4, but the difference in years would explain that. The best way, are you have to do it anyways if you are rebuilding it, is mic the pistons and cylinders, checking for size, collapsed pistons, etc. Get the book How to rebuild your Nissan/Datsun OHC engine by Tom Monroe. It will explain the measurements. That is though if you are doing a rebuild. Even if you are not, you can measure most of the cylinder and get an idea if they are oversize, just put the piston to the BDC and use a telescoping gauge, then mic the gauge. You should be able to see 10 thou worth of reboring. My engine with 110K on it still had the original cross hatching and less than .0003 of wear! I hope this helps and little. I would keep the engine and rebuild it if anything rather than getting a whole new one. They are not THAT much to rebuild, but more than a Chevy or Ford.
Joshua L.
 
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