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Old 07-11-2018, 09:59 PM
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ISO HELP OR INFORMATION!!!!

I have a Ď74 GMC SWB 350 (V8), found the oil real milky. Not real sure the reasoning behind how water got there. So, Iím looking for a motor I can drop in or any advice or insight one might have! TIA


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Old 07-11-2018, 11:52 PM
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Head gasket, intake manifold gasket, or cylinder head issue
Rip it apart, and you can fix it. If all you found was contaminated oil, she is likely salvageable. If it is the original 1974 vintage engine, I would rip the heads off, without question.



Give us more info. I would disassemble the top end and check gaskets before I swung a complete engine in, unless you know there is lower end issues.
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Old 07-12-2018, 04:45 AM
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Old 07-12-2018, 10:13 AM
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The Penguin is correct. Easy to find on the older engines. Most likely head gaskets.
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Old 07-12-2018, 11:17 AM
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Yes weíve torn the the engine down to the block. Is there a way to check if itís good? I thought you had to take to a mechanist for block to flushed, pistons to get honed, mil the heads down, and run the valves. I honestly donít know how all this works or even places to start lookin for either rebuild kits or motors when I find out what I need to do. And Iím looking to get out the cheapest way I can.


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Old 07-13-2018, 04:43 AM
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Not sure how many miles are on it, but I'd go ahead and pull the intake and replace the camshaft and timing gear and chain while you're in there. Those cams wear out at around170K.
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Old 07-13-2018, 06:50 AM
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OP, what is your mechanic skill level? They don't get much simpler than that 350, but if you are overwhelmed, then swing an engine.


To reply to your 2nd post; that is NOT torn down to the block, that is the intake removed, and that might have been all that was wrong. Did you find evidence of a blown gasket?


I would remove the heads, and take a look at the head gasket surfaces, and then you can see what shape your cylinders are in, and make a better call on replacing the engine.
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