[railroaderman]

Not on my Nova, but it is on my truck. 1994 GMC OEM 350 121,000 miles. This past summer the radiator tank busted (stupid plastic side tank crap) and truck ran hot (210/220) before I noticed it. Replaced radiator and no further issue until I went to check anti-freeze level this winter. Radiator low but truck had not shown high temp. Re-filled and checked it again week or so later, Little low again.

No leaks in heater core, no leaks around or in any hoses, nothing in oil pan. No noticeable white smoke out tailpipe and nothing noted in smell of exhaust (although my sniffer not too good). Truck cranks and runs good. Slight miss noticed when idling at red-light. Not sure what's going on unless it's a head gaskets, but not sure.

Checked compression and plugs. Cylinders 1, 3, 5, 7 all at 150 to 155. Cylinders 2, 4, and 6 at 130 to 145. Cylinder 8 at 155.

First two pictures below is plug # 2 cylinder. Next two are # 6 cylinder. Plugs in # 4 and # 8 looked OK.

Feedback appreciated

 

[railroaderman]

Appreciate the responses. I am going to do one more test with a "Combustion leak detection kit". Local Harbor Freight had one and basically it's a solution that changed color if exhaust gases are detected in the coolant system.

Shane - thanks for suggestion on internet search.

Dean - I'll do both sides for sure and have heads tested as well.

 

[railroaderman]

I'm almost convinced your right. It is what it is.

I looked at the Lisle unit but no one locally had one. Maybe the HF knock off will work.