new CNC ported aluminum heads

I was told they dont when I asked the guy selling them on ebay. Im not going to buy a set, but if someone wants to donate a set to me, Ill take a good look at them.

No helicoils in aluminum is just wrong. Maybe its just me wanting the best for my customers. I have seen a lot of rocker shafts bent all to hell from the bolts being ripped out of the aluminum threads.