[Inter911]

Kind of suspected that with the intake ports. The ones on the S engine do not look ported but look factory I think. The ones on one side of the T are obviously different from the other side as you can easily see the grinding marks on one side while the other side is smooth. It looks like someone just opened up the intake ports to about the size of the gaskets that were put on. And just at the mouth. The other side was left alone.

Good to know about the 12 mm nuts....I'll have to source some more then.