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Engine anatomy question

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Old Nov 4, 2011 | 05:59 PM
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Default Engine anatomy question

Ok, so I've got this coolant leak in my 72's 350 SM. Pretty good drip comming from the rear of the oil pan. I can see it dripping from the top of the arch where it meets the tranny. Nothing top side appears wet. I've got some UV dye that I'm gonna try next but what in the rear of the engine could be leaking? I checked the freeze plugs and they're ok. Got to be something midline above the rear of the oil pan. Any ideas?
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Old Nov 4, 2011 | 06:32 PM
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Originally Posted by medic1555
Ok, so I've got this coolant leak in my 72's 350 SM. Pretty good drip comming from the rear of the oil pan. I can see it dripping from the top of the arch where it meets the tranny. Nothing top side appears wet. I've got some UV dye that I'm gonna try next but what in the rear of the engine could be leaking? I checked the freeze plugs and they're ok. Got to be something midline above the rear of the oil pan. Any ideas?
Freeze plug rear of block.
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Old Nov 4, 2011 | 06:59 PM
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Intake coolant passage, head gasket.

As noted, there are two freeze plugs on the back of the block...but if they were leaking you wouldn't see it on the top of the arch.
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Old Nov 4, 2011 | 07:28 PM
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I looked around the intake from the top and I don't see any signs of leakage.

Wouldn't there be signs of an external head gasket leak? I don't notice any steam under the hood when the car is running or smell any antifreeze either.
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Old Nov 5, 2011 | 06:39 AM
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check your hoses that go to the heater core maybe one is pissing and running down the block
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