Spark Plugs

[Tim W]

My truck currently has NGK R plugs in it that need to be replaced due to an upcoming Dyno tune session. Are NGK plugs a better choice than ac Delco? I guess the NGK R plugs are what the guys put in while doing my holley sniper installation.

Also would the plug gap be based on my motor being a 97 vortec 350 or my Ignition coil being a Holley Hyperspark?

 

[0xDEADBEEF]

How old are the plugs? Any problems?

My experience is it really doesn't matter that much unless using a power adder. Whatever the manual calls for is fine.

 

[PlayingWithTBI]

I got these a couple months ago but haven't run em yet. With slant plugs on my aluminum heads I figured these would work better. They're gasket instead of taper fit but, you should be able to find some for your heads.

www.amazon.com/gp/product/B00JKR08QU/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

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[Tim W]

How old are the plugs? Any problems?

My experience is it really doesn't matter that much unless using a power adder. Whatever the manual calls for is fine.

The plugs are a few months old.. they are black though. No real problems The truck is running rich. That's why I need a good tune

 

[Dravec]

The plugs are a few months old.. they are black though. No real problems The truck is running rich. That's why I need a good tune

If it's running that rich, have you checked to make sure the O2 sensors are good? The fuel injectors? Cap, rotor, coil? There could be other things going on with the engine besides just a tune issue.

 

[RichLo]

If your spending the money on a dyno tune, get whatever brand you can that you can get an assortment of heat ranges. Put the middle range in to start the day and go up or down as the tune gets better and you can accurately read your plugs. You can return the unused plugs once you find the right ones.

What else has been done to the engine to justify a dyno session?

 

[Cadillac Bob]

I would think your stock plugs would be platinum but the copper does ring a bell but yeah o2’s I’d be checking first on the rich part! But it really comes down to what you prefer but some older vehicles aren’t meant for the newer tech plugs just a heads up but I did put those E3 ones in my old lil SL Saturn and it ran better! Not that it had anything wrong with it but I wanted all the basic stuff I could do to squeeze out more mpg’s since that was its purpose to save money as I drove all over for !!

 

[BeXtreme]

ACDelco iridium plugs are actually just rebranded NGK plugs. The ones in my 2011 Suburban with a 5.3 actually have the NGK number stamped on the outside of the body with the ACDelco number painted on the ceramic portion. The ACdelco are often half the price of the same NGK plug

 

[Tim W]

If it's running that rich, have you checked to make sure the O2 sensors are good? The fuel injectors? Cap, rotor, coil? There could be other things going on with the engine besides just a tune issue.

Yea all the stuff is pretty new. I'm not a tuner by any means. Its on the rich side at Idle. The plugs are over a year old (man time flies)

 

[Tim W]

If your spending the money on a dyno tune, get whatever brand you can that you can get an assortment of heat ranges. Put the middle range in to start the day and go up or down as the tune gets better and you can accurately read your plugs. You can return the unused plugs once you find the right ones.

What else has been done to the engine to justify a dyno session?

It's a nicely built cammed 383.