I'm getting ready to have my engine tuned. It's a 2414 cc H22A with 13.5:1 compression. Will be tuning it on at least 93 octane.

What heat range plug do I need to get? I'm thinking 6, but I want to make sure.

 

hope you have a sufficient head to run that on pump gas. its been awhile since i have bought plugs for my race car but the ones i am running show perfect heat range although you choice in fuel is dependent on heat range as well. run e85 or get a thicker head gasket.

2 cents

 

If you think I need to up the octane, I can, as the car is just a toy and won't be daily driven. E85 is not an option as there are no E85 stations in my area.

The car will be ran at 4,000 ft altitude.

 

7 heat range is about what you can do.

 

Use NGk