Quoting mitsuturbo:
that's on the 2g T/E/L.. they have a 10mm stud on each end of the exh mani and 8mm studs all in-between
a common "upgrade/mod" is to tap out the end holes for a 10mm stud... it works wonders for sealing and holding the exh mani tight to the head
This is also present on the later 1g 7 bolt engine cylinder heads. I do this mod when I do a head.
that's on the 2g T/E/L.. they have a 10mm stud on each end of the exh mani and 8mm studs all in-between
a common "upgrade/mod" is to tap out the end holes for a 10mm stud... it works wonders for sealing and holding the exh mani tight to the head
This is also present on the later 1g 7 bolt engine cylinder heads. I do this mod when I do a head.