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This motor should have 31k miles on rebuild. 1.9L. Motor drinks a bit of oil and spark plugs are always very fouled.

Thanks

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1979 4wd Mikado. G200, Gemini 250 Turbo, Clive Cam, Offenhouser Intake, JE Pistons, maXspeeding Forged Rods, Blow Thru Weber, Trooper 5spd, Intercooled

I hit it with seafoam spray thru the carb 4 times before pulling the plugs.

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1979 4wd Mikado. G200, Gemini 250 Turbo, Clive Cam, Offenhouser Intake, JE Pistons, maXspeeding Forged Rods, Blow Thru Weber, Trooper 5spd, Intercooled

looks like you had a valve hit the piston. My thought on this would be a rebuild due to the damage and if a valve did do that then you could have a bent valve and/or cracked head.

Looks to me like ignition timing issue. firing at the wrong time and the piston is in the wrong place. Might check distributor timing? Maybe plug to hot? NGK sometimes to hot in older engines? My $.02

The shiny spot on the piston worries me, like stated abouve, but the cylinder walls look good. Those angled scratch marks are from honing during a rebuild. That's a good thing. Deep scratches that are streight up and down are bad. Yours look good to me.

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OK, I'm over it. Where's the beer?

Looks like piston hit valve to me as well...

Looks like different cylinders to me. I vote the time is out a notch
..

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Maybe not now, but at one time the valve/ piston timing was off. With 31,000 miles already, I figure the previous builder early on realized the timing mistake and 'rolled' the cam to the correct position. Maybe before the engine even fired. The cylinders look real clean though. Yet member says plugs are fouled. With cylinder walls still showing hone marks, and fouled plugs, maybe the rings are too small for the pistons. Don't laugh, it happened to me.........I ended up with .020 rings on the .030 pistons. it took about 12,000 miles to start smoking and it was bad at 14,000 miles. Ran real good to start with though. Ha!

There are two ways the valve could have hit the piston. Having the cam timing off as has been said, or badly over reving the engine where the valve "floats" and wacks the piston.
Also two main oil burning sources,--either the rings to small ie wrong ring gap (too large) or- bad valve stem/guide seals, especially the intake valves.