Which NGK Spark Plug Do You Use In Your 440 on the Street?

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I ran champion n10yc in my 440. 509 purple shaft .060 over. Ran incredible. Not sure what that converts to ngk tho.
 
R5670-5 on the street were too cold a plug and my car did not like them in the cooler weather in the spring and fall here in Ohio.
 
Typo Hit the 5 instead of the 8.
Meant to say R5670-8 were too cold on the street only used R5670-5 or -6. Bob is correct heat range goes the other way. Used to Run Champion J10Y or J11Y on the street. R 5670-8 Were Like a J63Y if my memory still works..
 
mcodecuda said:
Which NGK spark plug do you use in your 440 on the street?
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NGK's seem to work better in my Mopars than other plugs. My buddy mentioned that to me once, I switched and love them.

I forget the exact plug numbers I have now, but I run two different heat ranges on 3 cylinders in my RB to get the same 3 to 4 thread discoloration from the end of the plug downward on all cylinders.

I started doing this after reading the 4 Seconds Flat plug reading write-up.
Spark plug reading can be complex and sometimes frustrating task this page will help make it easier and the results rewarding

20200427_174153(2).jpg
 
jbc426 said:
NGK's seem to work better in my Mopars than other plugs. My buddy mentioned that to me once, I switched and love them.

I forget the exact plug numbers I have now, but I run two different heat ranges on 3 cylinders in my RB to get the same 3 to 4 thread discoloration from the end of the plug downward on all cylinders.

I started doing this after reading the 4 Seconds Flat plug reading write-up.
Spark plug reading can be complex and sometimes frustrating task this page will help make it easier and the results rewarding

View attachment 1715630023
Click to expand...

THATS LIKLY BECAUSE OF THE UNEQUAL FLOW IN IN UR INTAKE RUNNERS !
 
famous bob said:
THATS LIKLY BECAUSE OF THE UNEQUAL FLOW IN IN UR INTAKE RUNNERS !
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Yes, I suspect it is too. These old intakes do have a significant port to port spread. Even though this one has been heavily massaged internally by Hughes and each ports flows a lot more and than they did stock, it still suffers from significant variations from port to port. They are closer to each other in terms of flow now, but there is still marked spread on several ports.

I would like to send a fresh intake to Wilson Manifolds and have them give it their max effort, but I've been to lazy to pull my current intake, bolt on the new one to get the head ports marked onto it and then replace the current one so the car runs while they do it.
 
jbc426 said:
Yes, I suspect it is too. These old intakes do have a significant port to port spread. Even though this one has been heavily massaged internally by Hughes and each ports flows a lot more and than they did stock, it still suffers from significant variations from port to port. They are closer to each other in terms of flow now, but there is still marked spread on several ports.

I would like to send a fresh intake to Wilson Manifolds and have them give it their max effort, but I've been to lazy to pull my current intake, bolt on the new one to get the head ports marked onto it and then replace the current one so the car runs while they do it.
Click to expand...

AGREE , WISH I HAD THE COIN TO SEND ONE TO WILSONS !
 
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