Sat too long with antifreeze on top of the piston, rusted the cylinder bore deeper than boring it .060 would clean up, didn't want to get into sleeving it.
I didn't expect that because I too thought 318 were stout motors. The guy let it sit for almost a year because he got busy with work and it was a difficult job with a 4" lift and 33" tires.
Dang. The engine was probably otherwise just fine til he did that.
If I have a head gasket leak that I can't get to I pull the lower rad hose and crank the engine with no spark plugs to drop the coolant level below the deck and blow the coolant out of the cylinders. Drain and fill the crankcase with some cheapo 10W oil with a fresh Walmart filter then add a tablespoon of ATF each in all 6 or 8 cylinder and a second good crank. Then just re-install the plugs finger tight. No rusting cylinders and no cruddy oil in the bearings...