Cascade Crew

91RSVert · Posted: Wed Oct 12, 2011 2:01 pm Post subject: Spark Plug gap help

I have a iron 350, with the 113 alumn heads. I have put in the delco plug for the an 89 vette. I think I gapped them at .035.

Ive not drove the car alot, and its starting to get a studder under load. Ive checked my cap n rotor button. I'm thinking I may have gapped the plugs wrong. Is 035 correct? Or should I raise or lower it?

91RSVert · Posted: Wed Oct 12, 2011 2:24 pm Post subject:

Just pulled one out, yes they need replaced.

I have delco FR5LS in it. I'm wondering about putting some of the delco shorties in it since I have headers. Any comments or suggestions on that?

Twilightoptics · Posted: Wed Oct 12, 2011 4:24 pm Post subject:

Stock ign run .035.

I ran .045 with an MSD and aftermarket coil.

Heat range is going to be more important.

91RSVert · Posted: Wed Oct 12, 2011 5:19 pm Post subject:

I just have an MSD coil.

Twilightoptics · Posted: Wed Oct 12, 2011 7:10 pm Post subject:

You should be fine with .035.

Misses will start to come on more with too large a gap, than with too small.

91RSVert · Posted: Thu Oct 13, 2011 2:33 am Post subject:

Thats what i was thinking.

Ive replaced them all. I found one that was set to .040 Confused

Dunno what I was thinking.