Quote
All variants of the mitsu 6G72 12V 3.0 heads are all pretty much the same but there are some variants in the cams, cam sprockets, and valve cover bolt boss. But there is no bolt on upgraded 12V head that I'm aware of.


Correct - and AFAIK, there's no "bolt-on" anything for the 3.0L 12v SOHC engine that will make more power. There are a couple of header sets manufactured, but I doubt much gain would be realized from them - maybe a little.

If you want to spend a day with a die grinder, the heads can be ported and gasket matched to the manifolds which might help a little. I've done that to mine, but I don't know if it does much more than makes me feel like I did something to "make it better".

Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum