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Old 05-18-2013, 05:04 PM
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spark plugs

which plugs should i use in edlebrock performer rpm small block chev str. plug 64 cc heads? have vic jr manifold forged flat top pistions .500 246 degree hydralic cam 750 demon carb and msd pro billet dist. I have been using champian rc12yc. was wondering if there is something that would work much better ty
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Old 05-18-2013, 05:10 PM
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do you have an issue with the plugs? are you using premium plugs?
performer heads and vic Jr,hows that work for ya?
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Old 05-18-2013, 05:17 PM
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do you have an issue with the plugs? are you using premium plugs?
performer heads and vic Jr,hows that work for ya?
the motor is a 355 c i in a 72 chevelle with turbo 350 and 3000 stall converter and 456 gears. it runs 12 flat at 115 plus with slicks. revs 7000 no prob. plugs worked fine. just wondering if there is a better plug i could be using
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Old 05-18-2013, 05:23 PM
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I prefer NGK myself.
115 should be mid 11s,lots of potential left
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Old 05-18-2013, 05:38 PM
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I prefer NGK myself.
115 should be mid 11s,lots of potential left
heavy car transbrake and 4500 stall would do it. But it is a total street car. Do you have numbers and heat range for the plugs. Are platinum any good for high performance>
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Old 05-18-2013, 07:18 PM
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I use iridium plugs myself
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Old 05-18-2013, 08:54 PM
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bet it run high 11 with an rpm intake
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Old 05-19-2013, 04:49 AM
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Always use platinum spark plugs unless you like to change plugs. Iridium spark plugs are not necessary unless you hav 13:1 compression ratio or a turbo or supercharger.

I replaced the Denso platinum/titanium fine wire spark plugs last weekend after the first 10,000 miles of street / highway driving in order to check the gaps and see how the heat range was firing. They were like new and were easily good for another 10,000 miles. I installed new plugs anyway since I already had the older spark plugs out. I will check the spark plugs again in 20,000 miles.

I switched form AC Delco #1 Rapidfire spark plugs to Denso PTF20TT spark plugs after I bought a set of AC Delco #1 Rapidfire spark plugs and discovered they were just remarked AC Delco CR43TS plugs at a higher price.

Use NGK or Denso spark plugs. The iridium spark plugs are that are used in the supercharged ZR1 Corvettes are made by NGK under the AC Delco label. The NGK spark plug are camouflaged as AC Delco because it would be difficult for a dealership to explain to a new owner of a $112,600 Corvette ZR1 with 638 HP that his spark plugs were NGK.
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Old 05-19-2013, 09:17 AM
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spark plugs

Changing brands of spark plugs from Champion RC12YC to NGK FR45 or FR5 is just preference. Another spark plug you could use is Autolite 3924. If you check your spark plugs and find you need to use a hotter plug go to Autolite 3926 and NGK FR4.
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Old 05-23-2013, 08:37 PM
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spark plugs

I use both the 10mm tapered deep reach) and the 14 mm in Stovebolt sixes. I too became dissatisfied with the AC product line and switched to Nippon Denso platinum and have no complaints. One runs in night drags and actually performs better throughout the full RPM range. The other is a daily driver and there was a noticeable MPG gain.
Normbc9
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Old 05-24-2013, 12:46 AM
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I have iron heads and 10:1 compression running a mildish performance cam xe 274h

i've had good results with ngk ur5 platinum spark plugs
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