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Make sure they are flat and use copper rtv. Stock heads use 1 heat rang colder which is an autolite 24. Stock is 25.
 

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many people feel that rtv high temp silicone is all you need and works best. Id rather use Remflex gaskets and feel they are a great option. Ive used them before and they will seal ANYTHING
 

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1995 GTS, 2014 GT/CS
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High temp RTV is all I ever use since I started using it a few years ago. I have never had a leak with that stuff. Coppercoat is a great RTV.
 
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