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Old 12-14-2012, 08:21 AM
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Tiny coolant leak

freshly rebuilt 327 Chevy. It's together and I filled it with coolant preparing for first start up. I wanted to let it sit for a few days to see if any leaks appeared, I hadn't checked for several days and then I noticed a small amount of coolant on floor. I traced it and found a very small drip (about 3 or 4 drops overnight) coming from the driver's side rear of the engine between the head and block mating surface, just above the rear side core plug. It is definitely coming from there and not the plug. I can see it clearly. I was going to pull the exhaust manifold and retorque the head. Any thoughts on whether you think this will fix it? I thought I'd give it a try before pulling the head which is a much bigger job. Thanks.

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Old 12-14-2012, 09:25 AM
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I've had small leaks seal after re-torquing, in proper sequence, with aluminum heads/mls gaskets on SBC's. Did you use sealant on the head bolts/studs where needed?
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Old 12-14-2012, 09:33 AM
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I did use sealant on the bolts and followed the torqe sequence. It's a 327 with 416 iron heads (from a 305). I'm guessing it's a coolant passge hole. I was hoping retorquing it would be OK. I'm gonna give it a try. I am concerned because theres no pressure in the cooling system yet since I haven't run it, and there is still a small leak. I have not retorqued it yet and the weather has gotten colder, aso maybe there a little of both at play.
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Old 12-14-2012, 10:04 AM
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I'd be concerned also, mainly for the same reason as you; it's leaking under no pressure. I'd probably retorque it too and give it a try, but not sure I'd expect good results.
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Old 12-14-2012, 01:39 PM
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Had this problem once on an Oldsmobile engine & sadly retorking the bolts didn't help. I'd used a cheap head gasket & found out that the gasket was my problem. Here are a few things you should check: (1) if the head was installed onto the block while the engine was in the car, verify that you didn't get any wires stuck between the head & the block (2) sometimes fluids run or travel down hill before the leak down to the ground. I would take the manifold loose & check the coolant hole on the front of the engine & make sure that coolant isnt leaking from there.

Good luck
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Old 12-15-2012, 09:23 PM
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OK, I retorqued the head and the leak stopped..... but only after I drained the coolant lol. Looks like I'll be pulling the head and installing a new gasket. I bought this engine in pieces and the guy I got it from had new gaskets still in wrapper (Mr Gasket) I'm ditching those, pulling both heads and going with Fel pro 1003.
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