SOmeone saif that doing a valve job on an old engine is agamble,becasue the increased compression will put increased stress onlower end parts.I am replacing the head gasket on a 3.9 dodge with 151,000 on it. I amdebating with having a valve job done or not. I will have it crackchecked and milled if necessary.Or I thought about just laping the valves at home. I put fluid in oneof the heads and it seeped out slowly of every valve but one.

stryped fired this volley in news:4fa97790- You're _supposed_ to get about 50% blow-by on that motor. It was never intended to burn the gas in the cylinders, but rather, in the exhaust where it creates that cool exhaust tone that motor is famed for, along with the hyper-cool tailpipe flames it makes.You shouldn't mess with leaky valves. You'll screw up the "street coolness" of the vehicle.LLoyd

Is this true for an engine

Apr 15, 2009 44 Replies

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Randy 17 years ago

No antifreeze, I can guarantee that. Thank You, Randy

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Stupendous Man 17 years ago

I thought dex-cool had been removed from the market after the lawsuits. It eats gasket material.

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Joe Pfeiffer 17 years ago

No, it's still out there. The claim is that, if you've got gaskets designed for it, it doesn't damage them.

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clare 17 years ago

Also stated as total volume/clearance volume - or volume at BDC/Volume at TDC

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clare 17 years ago

So it was running pure water in the rad when the head gasket or whatever caused it to overheat?

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