Topic: spark plugs
in Forum: C3 Engines
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Hi All,
Wanting to change spark plugs. Any suggestion? I went to Auto Zone and they recommended an Iridium plug. What do you think?
Thanks,
Darrell
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Duncanville, TX - USA
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If you're running a basically stock engine, there's no need to go for anything other than a "regular" sparkle plug, imho. The AC/Delco plugs work just fine.
Joel Adams
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Hi Joel,
The engine was rebuilt before I owned the car. Don't know much about. Only that it's a 350, has headers and an aluminum intake.
thanks
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Frederick, MD - USA
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Vette(s): 1969 convertible L71 427/435 4-speed black interior
Joel is absolutely correct. In a stock system installing exotic spark plugs only serves to enhance the spark plug maker's (and ad agency's) bank account at the expense of your wallet...but you do get a nice little decal in the box so you can place it in a conspicuous spot on your car so everyone knows what spark plugs you use. It's kinda reverse endorsement arrangement...instead of them paying you to endorse their product, you're paying them to endorse their product! Just joking...stock plugs are all you need.
The most important thing in selecting a spark plus is proper heat range. Unless you're trying to address a specific issue, the manufacturer's recommendation is all you need. Pick your brand. I have AC's in my '69 but I know many swear by NGK. Your money...your choice.
A second plug for the stock AC/Delco's here.
I think the technology of a carburated 350 calls for the stock plugs.
I wouldn't want to find out what the wrong plugs could do to my motor.
Tell us what you decide to go with.
Kevin
Thanks guys...I think I will go with the AC Delcos!
Lifetime MemberEquinunk, PA - USA
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Vette(s): 1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.
They're good enuf for the General, they're good enuf for me. 
if you have more time than money, you can index your stock plugs and file the ground back so that the end stops over the center of the electrode, there are different thories but I index the plug so the open end of the electrode- ground face the top of the piston and filing back the ground helps unshroud the spark, or if you don't have the time for a little more money you can try GM's Rapid Fire plugs they work and they are way cheaper than Iridium and Split Fire is junk. anips 2011-08-01 19:39:44
Hey Anips,
Where would be the best place to purchase GM's Rapid Fire plugs? They will work in a 350? Right?
Thanks,
Darrell
in Forum: C3 Engines
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