jz

They have washers that duplicate the tapered seat that vary in thickness. However, I do not believe anyone makes them for our plugs. Probably due to the minimal HP gain.

Goldenpony

Interesting, thanks. You learn something new every day.

jz

Here's a set I found on Summit's site (not necessarily for our cars, just an FYI for ya).

http://www.summitracing.com/parts/ACC-1001/?image=large

kentompkins

I ordered the set from Summit. Installing a Procharger over the holidays and planning on doing this while I have the tools out.

Here is the procedure I plan to use. Not going to take off the headers.

http://www.bullittarchive.com/5005.htm

I know the gain is minimal. I just want to conquer the challenge and be able to say I've done it.

Marc S

The HP gains will be greater than 1% with forced induction. It would be interesting to do 3 dyno pulls before and after the indexing to see what the average gain is. Of course, you would have to do them all the same day which would be difficult.