351w cracked block?
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Joined: Jan 2002
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351w cracked block?
I have a puzzling question about a 351 that I have access to.My cousin rebuilt it and it ran good.Then it sat for a couple years,and my uncle put it in a car of his.It ran good but it kept overheating.He figured a head was cracked so he had the heads tested and plained but it still kept doing it.It would actually swell the radiator hose up,and if you didnt shut it off it would blow it.But,this was a mercury and he figures that the exhaust system on the car wasnt big enough for the engine thats why it would overheat.I figured it sat with water in it and the block cracked,but he says it had 65 below antifreeze in it.Anyways,if you unhooked the exhaust it wouldnt overheat.I want this engine for my truck,but I would like to know if it is worth the work to put it in.Its only got 4000 miles on the rebuild!Anyone have any thoughts on it?
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Joined: Jul 1999
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351w cracked block?
If it swells the radiator hose to the point it will burst then that likely means either a head gasket failure or a cracked head , you have a pressure buildup , removing the exhaust allowed the excess pressure to have an easier means of escape . Exhaust gases are entering the cooling system . A cracked block would allow coolant to leak all the time .
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351w cracked block?
Yeah, I figured maybe a cracked head but he sent the heads away and had them checked and plained.He was told that there was nothing wrong with them.So,it got a set of new head gaskets too.It never got to hot to hurt it.He also only ran the y-pipe off of the manifolds into a new muffler with a tailpipe,there wasnt any converters on it.Could the radiator that was in the car be too small for the 351?He has been told that the exhaust was too small for the engine,being it had a 302 in it originally.But,I find that hard to believe.
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