Has anyone tried AC delco platinum plugs in their 3.5 litres? They are made in USA and cost under $10 each from your local Holden dealer. They sound ok but should I stick with NGKs ?

never heard of these ones....
i stick to my ngk iriduims

i'll have a look in a mag i got tomorrow, they have a write up of a few different plugs.

dyno results too :D

Hey here's a new type of plug. It looks like it's pretty good. Depends how much it costs though.
www.greenfire.com.au