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Spark Plugs - SP519 vs SP534

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Old 03-16-2015, 04:54 PM   #1
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Default Spark Plugs - SP519 vs SP534

Here is the way I understand it:


The SP519 is the correct plug for the 5.0 under normal (stock) conditions. It comes gapped from the factory at approx. .051. Many guys are gapping down to .045, especially if running a tune. There is some variance in the manual depending on what year your truck is, but .045 seems to be widely accepted as a good number.


The SP534 is the correct plug for the ecoboost under normal (stock) conditions and comes gapped from the factory at approx. .030, some gap them down to .028. Apparently this plug is also recommended if you are running forced induction on your 5.0


Here is my question - is there any difference in these plugs other than the gap, such as heat range? Further, can the SP-534 be ran in the 5.0 without a supercharger? I'm not sure you'd want to try and open the gap from .030 to .045 without breaking the tip, right?


Honestly, the reason for asking is that I was shipped the SP-534s and trying to decide if I mess with them or send them back for the SP-519s. I run a 5* 93 tune with LT headers and an intake.


If anybody has any lessons learned, further or corrective information, I'd greatly appreciate hearing it.
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Old 08-04-2015, 01:31 PM   #2
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bump:

as im looking at 519 vs 534 for my 11' 5.0 stock config.
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Old 08-05-2015, 09:35 PM   #3
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519's are OE for the 5.0. 534's are OE for the EcoBoost. both plugs are the exact same minus the gapping. 0.045 is widely accepted for the 5.0. 0.030 is accepted for EcoBoost. You can gap the 534's to 0.045 and it will be the exact same as the 519's.

It is noteworthy, the 519's ship with a 0.051' gap from factory.. meaning you have to gap either plug to 0.045 if you are so inclined to do so.
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Old 08-05-2015, 11:11 PM   #4
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copy thank u!
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