Oil Filter Adapter
@Earlie A Hang onto that thin headed bolt! You can get 2 of the oil holes welded up, then step down a little ways and drill 2 new ones. The thin headed bolt is required with some TTI exhaust systems.
@65barracudaLA had to saw the head of the bolt on his car off to get it to fit with the TTI head pipe he used on the factory passenger side manifold. I'm not sure if their headers require the same thing or not? If it does, I'd rather modify the oil holes than saw the bolt head thinner! Here is the pic he posted of his after he sawed it in two.....with a HACKSAW. :eek: