08-25-2014, 11:24 PM
Join Date: May 2007
Location: Fort Atkinson, WI
Re: 2001 Z28 plug change
Originally Posted by Injuneer
I believe there was a technical service bulletin (TSB) that changed the recommended plug to the AC Delco 41-110 iridium plug, gapped to 0.040". The gap is set at manufacture and should not be changed, or it can damage the plug.
Do not confuse this later TSB with an earlier one, which had recommended ACDelco 41-985 gapped to 0.040"
Not sure that using the plug you selected, in place of the recommended plug would cause a noticeable change in engine performance ("runs like pure crap" isn't very specific). I would check for wires not fully on the plug, cracked plug insulators, plugs not torqued to spec.
Ok, first of all I do not want to hijack this thread. I'm thinking of changing the plugs in my 01 ss which are original. What one of the plugs that you have listed do I need. I'm thinking the z-28 and ss used the same plug right?
I am not interested in anything but stock as you can see by my sig on all of my cars.
1989 Firebird Formula, 305 TBI, auto, 100% stock
1989 Firebird Formula, 350 TPI, auto, 100% stock
1991 Camaro Z-28, 350 TPI, auto, 100% stock
2001 Camaro SS, LS1, auto, 100% stock
Last edited by cars3; 08-25-2014 at 11:28 PM.