I've found the same results as Larry with the Bosch Platinum plugs and also with the AC Rapidfire: better idle in a mostly street driven car. Overall performance remains the same though...
I've experimented with a lot of different plugs in my Nova and it definitely likes the NGKs and ACs. Champions suck. Those things will break if you look at them wrong, had one where the threads twisted off the plug and remained in the head and I did NOT apply any undue force to it.
Haven't had a chance to experiment with plugs in the Formula. Was running the Bosch platinum's in it because they were on sale and I knew they worked good.
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'72 Formula 400 Lucerne Blue, Blue Deluxe interior - My first car!
'73 Firebird 350/4-speed Black on Black, mix & match.
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