Hey guys, I have a 93 Mustang 5.0 and I keep blowing head gaskets. I am running 8-9psi with Aluminum GT-40 heads. I use 94octane pump gas. I blew the first gaskets with the stock heads and then again with the new Aluminum heads. Could this be due to not running enough octane? I plan on installing a Water/Meth injection kit this winter. The car put down 354rwhp before adding the GT-40 heads. I'd guess I am around 400rwhp now.
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