C5 spark plugs?
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Joined: Oct 2016
Posts: 95
Likes: 6
From: San Francisco CA
C5 spark plugs?
I picked up some new spark plugs for my 2000 corvette which I've owned for 3 years. It has 32k mi. runs fine but plugs may be original. Decided to go with as close to stock as was available and was told that would be the AC Delco professional Part # 41-110 which has changed from original part number over the years.
My dilemma is that the manual says the original plug gap is .06 The new plugs are all gapped at .04 Soo.. Because these plugs are Iridium (original ones I assume are copper) should the gap be left at ,04 ?. Also anyone know the correct torque value? Looks like 15lbs but I've seen other numbers.
Thanks a million for any help with this!
My dilemma is that the manual says the original plug gap is .06 The new plugs are all gapped at .04 Soo.. Because these plugs are Iridium (original ones I assume are copper) should the gap be left at ,04 ?. Also anyone know the correct torque value? Looks like 15lbs but I've seen other numbers.
Thanks a million for any help with this!
Melting Slicks
Joined: Feb 2007
Posts: 3,297
Likes: 398
From: Raleigh Suburbs
Well according to this Post: https://www.corvetteforum.com/forums...post1600075159 TR gapped their iridiums @ 0.050, therefore what how could it be bad to run 0.040? I don't see a solution. Are AC Delco's even worth running, what if they are not all the same? I do not know. Everybody I know runs NGK's.
Racer
Joined: Oct 2003
Posts: 274
Likes: 42
From: Venice, Florida
The difference between .040 and .050 is less than the thickness of 3 sheets of notebook paper. It isn't gonna make any real difference. Go with .050 and you'll be fine. Also leave the torque wrench in the tool box and just snug them up. Also whenever going into aluminum I always put anti-ceise on the threads.
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Le Mans Master
Joined: Aug 2005
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From: CA.
St. Jude Donor '13-'14-'15
Originally GM said .060 then years later they changed the recc. gap to .040
The larger the gap the more chance of a misfire --wires must be perfect all the time---as well as all ignition wiring----NO HP gains by going to a larger gap
PS Magneto ignitions that run on alcohol -- top fuel blown engines and even N/A engines only run a gap of .016 !!! and they can make 1000's HP
The larger the gap the more chance of a misfire --wires must be perfect all the time---as well as all ignition wiring----NO HP gains by going to a larger gap
PS Magneto ignitions that run on alcohol -- top fuel blown engines and even N/A engines only run a gap of .016 !!! and they can make 1000's HP