Dennis, I set my NGK's to .059" my stock plugs with 1200 miles were between .085-.110 thanks GM
------------------ Carl V. *****Authorized Zaino Distributor*****
Huntingdon Valley, PA.** 2000 Magnetic Red Convertible **
** Corvette Club of Delaware Valley ** www.hcvind.com
E-Mail: [email protected]
I would recommend between 0.055 and 0.060, depending on mods. With minor bolt-on mods (intake and anything else) go closer to 0.055, and if you are bone stock 0.060 is fine. I run mine at 0.055 and the car runs like a scalded dog.
I put the TR55 (can't remember the rest of the number) Iridium plugs recently in my SS. The box specifically said not to try and change the gap because the tips are small and can break. I cheked them anyway and they were around .58.