$10.00 per plug! That better include installation considering what a PITA installing LT1 plugs are;
another reason why I'm building up my '81 T/A rather than continue with my Z. As long as you don't spray, most decent brand platinums will be fine. I'm considering those +4 Bosch Platinums for my '97 Z-28, I just have yet to price them. As for non-platinums, a lot of the guys on latemodel boards and several friends of mine with LT1s use NGK TR55 for both N/A and nitrous applications. I was told they will probably last only about 5-7K miles, but they perform great under hard use.