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Got her fired up, running greaat. Had no obvious signs of any problems. At a loss, but all put back together and no leaks.

yeah think I’ll pull the intake tomorrow to look around some more and then heads. Trying to figure out what head gaskets were used

I’m just confused at how coolant would get in the #2 cylinder from the intake, it would go straight to the oil pan I thought

Yeah I believe so, it always ran great with no noticed coolant leaks. Motor probably doesn’t even have 200 miles on it. It was broken in on a dyno

Antifreeze was coming out of the oil pan drain plug first then followed by the oil antifreeze was coming out of the oil pan drain plug first follow by the oil. 1 to 2 quarts was judging by the oil level on dipstick

Probably was down a a quart or 2. Oil wasn’t milky was layered with the anti freeze being on bottom and good oil on top.

Car has been sitting inside for 5 years, haven’t cranked it yet, was getting it ready to crank and noticed this coolant issue so I am just trying to trouble shoot it some. Tempted to fire it up and let it warm up and then let it cool to see if the coolant is still leaking. Or if it just slowly...

Yeah I agree, just wanted to get an idea before I started tearing down. I’ll pop the intake and take a look, but wouldn’t that put coolant down in the oil and not cylinder if it was leaking?

All components redone, and upgraded. Stroked to 416, roller cam

Still no smoking gun, pressurized coolant system and it held. Any ideas?

Ok leak down shows all cylinders at 2% cylinder 2 is way higher at 20ish %. Thinking the coolant washed the oil off the rings when it was sitting. Didn’t see any bubbles or anything in the radiator. May pressure check the coolant system to see if I can see anything before removing the heads

Doing a leak down test when I get home if all the cylinders, will keep y’all posted

Thanks was thinking the same. I put fresh oil it in and sucked coolant out. Also put marvel myster oil down each cylinder, rotated freely by hand. Wonder if I should prime oil pump and fire her up to see if she’s leaking steadily?

Hello I have a 340 that’s been sitting in the car for a few years without running. Freshly built with not many miles on it. Ran perfect when parked but I’m now going thru it and noticed coolant in the #2 cylinder. Any ideas? Maybe head gasket was weeping over the years?

Hello, new to the forum from Georgia. I have a 340 6 pack fresh out of storage and was wondering what the recommended fuel from sunoco would be for general running and storage? Was debating between Sunoco Surge or Standard. Would probably mix 2 to 1 with ethanol free fuel. Thanks