Cramer Posted June 23, 2009 Report Share Posted June 23, 2009 Hey all. I just swapped out my plugs the other day. I bought the truck a few months ago with 128k on her and honestly it don't look like it had more than 40k. Well pulled the first plug out, and wow. The gap looked large so I checked the gap. It was .060. I looked to see what kind of plug it was, and AcDelco was on the side. Wait a minute on the other side it was NGK. So the plugs were AcDelco - NGK plugs. Are these plugs the stock plugs? I don't have the part number off them but I put in the NGK TR5 plugs and it didn't make a difference. I did get a little better gas mileage, but I thought it make a little more power with the plugs gapped at .040. Also the NGK plugs I put in didn't have AcDelco - NGK on them. Quote Link to comment Share on other sites More sharing options...
thomp62301 Posted June 23, 2009 Report Share Posted June 23, 2009 The original plugs do say AC Delco/NGK on them. I can't remember for sure but I think .060 is the correct gap. Quote Link to comment Share on other sites More sharing options...
Cramer Posted June 23, 2009 Author Report Share Posted June 23, 2009 WOW. Got atleast 129k out of a set of stock plugs. I know in the manual it says .040 for the gap. Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted June 23, 2009 Report Share Posted June 23, 2009 What type of plug did you install, copper, platinum, or iridium? Quote Link to comment Share on other sites More sharing options...
Cramer Posted June 23, 2009 Author Report Share Posted June 23, 2009 I put in NGK TR5's. V-Power copper plugs. My fuel mileage went up but throttle response went down. I'll probablly change to the TR55's soon. Quote Link to comment Share on other sites More sharing options...
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