I'm not sure I'd describe it as a proactive teardown, more like a "I don't know what to do next, so I guess I'll rebuild the engine" teardown.

The bores were in remarkable shape, you could still see the cross hatching after 30 years and more than 100,000 miles. The shop told me that they didn't need to bore the block, just break the glaze and install new rings and bearings. I think Nissan must have used old battleship hulls for the metal to cast those blocks.

Mainly I suppose I wanted to make sure that the coolant passages were clean and unobstructed. Same thing with the head, except that the valve seats were pretty bad, so I went ahead and had them ground.

I'll let you know how it looks tomorrow.



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Ty Till
#16 ITS
Rocky Mountain Division