Spark plug indexing

QIKSILVR · March 20, 2003

This may sound silly but...what is spark plug indexing? Is it difficult? What are the benefits of doing this? ???

cyrylyn · March 22, 2003

I've only heard of crankshaft indexing..

dsmazz · March 23, 2003

Spark plug indexing refers to installing each plug so the opening between the electrodes is in the same position relative to the twelve o'clock position. I used to do this years ago on a '69 Z-28 I owned, thinking it evened out the power developed from cylinder to cylinder. Does it help? Maybe on highly tuned engines, but I doubt it makes much difference on a daily driver. Could be wrong, but I'm not going to take the time to find out.

fenderbender · March 23, 2003

It's not worth the time or trouble unless it's making a lots of HP

TROYROBO · March 23, 2003

ditto-----same thoughts as fenderbender

carguru · March 23, 2003

Ah, the old hot rodder's trick. Have to agree with dsmazz, fenderbender and Troyrobo, won't make much noticible power power difference on a daily driver.