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Dude...normally it's not too horrible. Usually a weekend will do it but you may want to get your heads cut for special gaskets. That is time and money to get them done. Since you are supercharged you are running higher pressure/temp at the heads and this is why you blew the gasket most likely. There is a special gasket, I think from FelPro, where they are O-ringed to be able to handle the extra pressure but the heads need to be grooved for them. If you just go back and put non ringed gaskets back on spend the money on good ones so they last longer. Don't shave your heads either as you have plenty of compression with the supercharger.

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Q: How much labor is involved in changing a blown head gasket out of a 1994 Mustang Cobra Supercharged The engine has 150000 Ks but still ran strong before the gasket blew I am also running 47o horses?
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