TimS
Well-Known Member
Bought my Duster back after 12 years. Original Motor was swapped to a 408 Stroker. It has NGK R5671A-7 plugs installed. I’ve never been fond of NGK plugs. Anyone have an alternative they’ve been happy with?
What plugs are You Running in Your 408 Strokers.
- Thread starter TimS
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Professor Fate
Push the button, Max...
I've been an Autolite guy for decades, but I've gotten a number of the bogus Autolites in recent times...
Had issues with Champions years back, but they seem to be on the rebound now. I'm not used to their new numbering system yet...
People seem to love their NGKs, so I may be trying them next.
Don't even bring up E3s.
Had issues with Champions years back, but they seem to be on the rebound now. I'm not used to their new numbering system yet...
People seem to love their NGKs, so I may be trying them next.
Don't even bring up E3s.
abodyjoe
Well-Known Member
i prefer the ngk plugs
We run the 7938 aka bkr5e plugs from your first post in approx 30,000 crate engines a year. They are a HUGE upgrade to the old 792 champions we ran in the past.
If I was going to try something else, it would be bosch. But I have no reason to as the ngk's have been great. They are my favorite by far.
BPP7938 NGK 7938 BKR5E Spark Plugs - Set of 8
I've run nothing but NGKs since the 80's.
Type of fuel, Cam, compression ratio, Carb CFM, Exhaust, altitude. All play a roll in plug heat range. Only you can determine what plug or heat range works best.
TimS
Well-Known Member
So if I’m correct that your 5 range plug is hotter than my 7. I pulled the plugs yesterday and they have a black sooty coating on them. I cleaned and put back in. I’ll keep the NGKs but might look at a different heat range.
Dartsun
Mopar Dude
NGK always in my blueprint crate. Had tried the champions and they were expensive and sucked.
This ^^^^^
Nobody's answers are right unless you answer all these ^^^^^ questions.
furrystump
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autolite 65’s so I can change them like underwear and not cry. Work fine for me.
Why no E3's, just gotta know?
Snake oil.
I have had buddies try them in late model stuff and throw engine codes. Lol (E3)
340six
King Of Bling
340six
King Of Bling
And as far as the OP question i have all 3 of these in my cabinet at different times were on sale. Got about 120 of the 3 types. All 3 ran well and were cheaper to swap than snake oil high $ ones.
Tim,
Yes to answer your question, NGK 5s are hotter than 7s. There will be a lot of engines running around with cold plugs [ that are not needed ] getting carboned up with soot & running poorly. Plugs have a very generous temperature working range, about 800*F, which got extended with the use of copper in the centre electrode.
Yes to answer your question, NGK 5s are hotter than 7s. There will be a lot of engines running around with cold plugs [ that are not needed ] getting carboned up with soot & running poorly. Plugs have a very generous temperature working range, about 800*F, which got extended with the use of copper in the centre electrode.
TimS
Well-Known Member
Mine were sooty so might try a hotter plug and see how that goes.
aaronk785
Well-Known Member
I use NGK heat range 6 with 100 shot of nitrous or n/a. Plugs are always clean. If I go to a 150 shot I change to a number 7 non extended tip. Never had a bad NGK.
It has probably been asked, what heads and compression?
You may be too cold on plug but going up in heat range may not be the fix.
j par
Well-Known Member
Nice observation!!..
Any idea what carb and intake he's running? Carb may have issues or need some tuning.
jbc426
Well-Known Member
My builder recommended Brisk Spark Plugs for my supercharged 408 Magnum stroke. I had never heard of them before, but went with his recommendation. I'm just finishing up with the final installation engine and transmission swap, but will post an update once I learn how they do.
One my RB stroker, I have always run NGK's. They seem to clean up the idle and low rpm operation.
briskracing.com
One my RB stroker, I have always run NGK's. They seem to clean up the idle and low rpm operation.
Brisk Silver Racing D10S Spark Plug
D10S Brisk Racing Silver Spark Plug Brisk SKU - D10S Parameters: Thread Diameter 14mm Thread Reach 19mm-3/4" Hexagon 16mm-5/8" Seat Type Gasket Design Silver Racing Resistor No Projected No Heat Range - 10 Brisk D10S Replaces: NGK 5671A-9 Denso Iridium IK27 Denso Iridium IK01-27 Denso...
briskracing.com
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