What spark plug is recommended??
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Intermediate
Joined: Jun 2005
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What spark plug is recommended??
I just put long tube headers on my C5 & while I have it down, i'm replacing the plugs. Should I stay with the NGK TR-55's or go with something else? Thanks in advance for your help 
Safety Car
Joined: Oct 2000
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From: Monticello MN
Originally Posted by Sean98C5
I just put long tube headers on my C5 & while I have it down, i'm replacing the plugs. Should I stay with the NGK TR-55's or go with something else? Thanks in advance for your help
Ed
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Joined: Jun 2005
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Originally Posted by C5XTASY
Go with the AC Delco 41-985 Iridiums. They are now the stock plug for C5s. They are as good, or better, than anything else out there, and you won't have to change them out once a year as they're a long-life plug. I have never seen any documented, measureable proof that any plug, properly gapped, and properly heat ranged, from a reputable manufacturer, performed better than any other reputable manufacturer's plug, power-wise. You can usually buy them cheaper at an auto parts store than from a dealer.
Ed
Ed
What is the gap setting on these? Are they pre gapped?
THanks.
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From: Monticello MN
Originally Posted by jag71usa
What is the gap setting on these? Are they pre gapped?
THanks.
THanks.
Ed
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Originally Posted by C5XTASY
They come pregapped. If memory serves me right, it's .040. Take a look at the AC Delco website. I checked all of mine, in the store, at the time I bought them. They were right on.
Ed
Ed
yeah but the correct gap for the C5 is between .050 and .060 I do believe....
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From: Springfield VA
Originally Posted by C5XTASY
Go with the AC Delco 41-985 Iridiums. They are now the stock plug for C5s. They are as good, or better, than anything else out there, and you won't have to change them out once a year as they're a long-life plug. I have never seen any documented, measureable proof that any plug, properly gapped, and properly heat ranged, from a reputable manufacturer, performed better than any other reputable manufacturer's plug, power-wise. You can usually buy them cheaper at an auto parts store than from a dealer.
Ed
Ed
Been working on cars for 10+ years and that is true. The only ones I really stay away from are Autolite as they just paint their threads so they rust easier and stick in the head more.
Also do NOT use a ramp plug gapping tool on Iridiums as that will damage them and also a lot of Plat. tip ones as well. Use the right tool, but most Iridiums and even plats now seem to come pre-gapped.
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From: Monticello MN
Originally Posted by pewter99
yeah but the correct gap for the C5 is between .050 and .060 I do believe....
Not for the iridium plug. It's .040. Look it up...http://www.acdelco.com/
Ed
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Originally Posted by C5XTASY
Not for the iridium plug. It's .040. Look it up...http://www.acdelco.com/
Ed
Ed
yep....so whats the deal?? anyone care to explain the huge difference