I've found a lot of different answers. I bought Iridium plugs.

 

David's XKR; From what I found, the gap is .035 -.039. My source was in the FAQ section, scroll down to Specifications (outlined in green box), open the info and there it will give you the specifications by model and engine. Hope this helps.

 

Thanks for the info. I looked through the FAQ twice and could not find the section you mentioned.

 

Here:

 

Thank you