What plug is an autolite racing plug 2 steps colder?

regular is like a 103 I think right? I have no idea...but I need to get a set in the morning.

Stock head castings for LT1

 

Stock is 106, 104 is anywhere from 1/2 to 1 steps colder than stock (depending what source you believe), 103 is 1-1/2 to 2 steps colder than stock. I run a 104 for NA, 103 for a small (125-150HP) shot of nitrous, and a much colder Champion racing plug for the 300-shot.

 

So will that work o.k. using the stock type and not a race type?

The comp is a little over 14 static, I have 103's I can use but was told to use the race plug....I have not a clue what the difference is other then it has half an electrode on it.

And I will be running 112 if it makes a difference

 

Might want to add all the info with the original question... not many people are able to remember the detailed specs of other's engines. I run 10.8:1, so my experience with plugs would not be applicable to the engine you describe. Someone more knowlegdable in an engine similar to yours will have to help you.