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Old 05-28-2020, 12:51 PM
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TransAm 474 TransAm 474 is offline
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Default NGK Plug

Good day everyone... Does anyone know if a NGK Spark Plug exists that is the same as the NGK R5673-8, but in a Resistor plug? They are for 6X heads, and need to be 5/8" wrench, .460" reach, tapered seat, perferably "Non-Projected" tip. The engine is a 461 with a single SXE480 billet turbo making maybe 800+hp with 10-15 lbs of boost. 100% street car on pump gas. I will be running the Holley XFlow 1375 EFI, and it recommends "Resistor" plugs to keep RFI problems in check. I think the heat range of the R5673-8 would work great for me, but I need it to be a "Resistor" plug. Anybody have a recommendation for a part number? Thank You

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Last edited by TransAm 474; 05-28-2020 at 01:16 PM.
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Old 05-28-2020, 01:00 PM
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Subscribed, cause I'm having trouble finding non projected tip, resistor NGK's as well. Different application though... Hope you find what your looking for.
https://www.sparkplugs.com/Data/uplo...ug_Chart_1.jpg
This will help, but I'm not sure you'll find non projected tip...

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  #3  
Old 05-28-2020, 02:33 PM
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Quote:
Originally Posted by Scott65 View Post
Subscribed, cause I'm having trouble finding non projected tip, resistor NGK's as well. Different application though... Hope you find what your looking for.
https://www.sparkplugs.com/Data/uplo...ug_Chart_1.jpg
This will help, but I'm not sure you'll find non projected tip...
Thank You. I'm actually starting to lean more towards a "projected tip" plug for this application, since it is street driven. I have came to that conclusion after reading a comment over on one of the turbo forums, where a NGK Tech had responded and explained that, even with boost, it is better to run the projected tip in a street application, since it keeps the tip of the plug burned cleaner, keeping it from fouling. The coldest "Resistor" plug I can come up with in the NGK, with a tapered seat, .460" reach, 5/8" wrench is the NGK UR6(7773 Stock Number)plugs. The NGK Tech says it is 2 steps colder than stock Heat range, so that should work for me. I have since read quite a few people using them with great results in Street boosted applications as well. Anyone see any problems with the UR6 plug in this application?

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Old 05-28-2020, 03:27 PM
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I guess NGK tech is saying a "4" heat range would've been stock? I run a "6" heat range (BKR6E, for an edelbrock head) normally aspirated. And I don't disagree with the projected tip for normal driving. Mine are as well. But I was hoping to find a non to try as well. Same deal as you, electronics that won't tolerate noise.

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Old 05-28-2020, 07:05 PM
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Larry Navarro Larry Navarro is offline
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I use the extended or projected electrode in all my 2-stroke MX bikes since the '70's. High revving 2-strokes are brutal on plugs.
The electrode actually runs cooler as it is the the direct path of the air/fuel mixture, as opposed to the "shrouded" (regular) electrode.
Another advantage is more efficient burn with the electrode extended further in the combustion chamber.

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