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Please explain how a rock and play doh got in there in the first place. Did you try a grab-tool like this? Or maybe a coat hanger with a loop at the end, then a blob of thick epoxy on the loop, stuck to the rock? Then when cured you maybe can pull it out?
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How about a bent 1/4" steel rod, like a "J" that can get under it and yank it out? Or can it be pushed all the way in so it drops into the oil pan? Is that an oil or coolant drain spot?
 

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EPOXY TRICK?!?
Yes, it worked for me once. I was doing a timing chain on a Pontiac 400. The block was drained and the timing cover was off the front of the block. There are two large openings for the water pump flow into the block. I still don't remember how but a critical bolt bounced right into one of the openings and fell down inside. It was 304 stainless steel so no magnet would work. The claw-reacher tool could not get a purchase on it. You could just barely see it. I could not ignore it because it was for a custom alternator mounting. It took me forever to get one that exact length and stainless so it would not corrode. It HAD to come out. So I made up a ball of thick sticky epoxy and wrapped it around a loop at the end of a coat hanger. I carefully snaked it down inside and got the epoxy all over the bolt. I just let it sit there overnight. The next day it had cured and all I had to do was carefully withdraw it from down in side the block and I got my bolt back. Never say never!
 

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It was a 1980 Trans Am Firebird. Someone had yanked the 301 and put a 1978 400 in there. The original owner was a total idiot and we have spent years un-doing the damage. The bolt was for a custom serpentine belt conversion and had to be an exact length to go into a blind hole in the aluminum modern alternator upgrade. Stainless won't act galvanicly with the aluminum and I often upgrade to stainless on anything coolant or exhaust related. I learned that working on boats that operate in salt water. But I still don't understand how the rock got into the Cobalt although as I said, never say never!
 

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No, not a turbo 301. But in '80 the 301 used in the TA did have a more agressive cam and the detonation sensor that the turbo engine used. I agree, if idiot GM had put development into the turbo 301 the third gen F bodies would have been killer. I still don't understand where this rock is wedged. Oil or coolant area? If coolant jacket you could probably jam it all the way in it will stay put. If crankcase then I would worry.
 

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You know I just can't find a coolant flow diagram. I have two FSMs and they have oil flow but not coolant. I ask because that spot is dark like an oil drain and open to crankcase fumes. Most coolant passages I have encountered have been round holes or slots and more clean. I will continue to search......
 

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Here ya go. See the slots surrounding the bores? The triangle shaped holes between the bores? Coolant passages are located where they can do the most good- surrounding the cylinder bores and combustion chambers. See the other openings? Those are oil drainbacks and open to the crankcase.
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