View Full Version : Spark plug gap

07-24-2007, 03:03 PM
What is the best plug gap???:confused:

07-24-2007, 03:12 PM
035 - 045
im using 045 works very well under boost


07-24-2007, 03:15 PM
What is the best plug gap???:confused:

Hey, if your car is mostly stock with stock or close to stock boost just use the stock specs that you will find under your hood.

My car is pretty modified. I used Autolite 103 non-platinum spark plugs with .035 gap. Factory spark plug gap specs are slightly more, but I don't remember specific numbers.

07-24-2007, 04:04 PM
on a 90 sc /w 5sp ,underhood tag say's 052 - 056 for the plugs


07-24-2007, 04:33 PM
The higher the boost the smaller the gap. .035 for high boost and a colder plug like the autolite 103. I ran stock plugs with .045 before up the boost


07-24-2007, 04:43 PM
I am runnig a 10% pulley as of today and was curious if i need to change my gap. I don't know what gap they are set right know because the plugs where changed last year before i owned it. I have only had it for 2 months.

07-24-2007, 06:18 PM
I run about 15# of boost and still use the stock plugs and stock gap of 0.054 Mine is a mustang motor with the SC blowr so thast why my boost is a little lower, I am running a 15% OD as well.