Those gaskets always squeeze out and it leaks after awhile. The AM ones are knock offs of the "Cobrabob" gaskets but those leaked on me too when I used them. Always just did black RTV and it never leaked. And yes, pennzoil syncrhomesh is the ****.
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.