Bracket Talk
Spark plug

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https://drr.infopop.cc/eve/forums/a/tpc/f/80760912/m/2617064086

March 10, 2018, 09:06 PM
Duane
Spark plug
What plug to use Mopar 500 gas motor?
March 10, 2018, 09:19 PM
imakehp
Autolite



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Dave



F J B

March 10, 2018, 09:40 PM
Duane
it has been many years since I ran gas that I simply don't recall what plug number I used. I am thinking J 12 Y champion but hoping some one has info so I can fire it up.
March 11, 2018, 08:57 AM
sr4440
what cylinder head is on the engine?


Without data, you’re just another guy with an opinion.
March 11, 2018, 09:33 AM
TD6297
quote:
Originally posted by Duane:
it has been many years since I ran gas that I simply don't recall what plug number I used. I am thinking J 12 Y champion but hoping some one has info so I can fire it up.


Iron heads do use the short reach plugs like the J12Y. I'm not sure about the TF or Indy but I know that Eddy heads are a long reach. So as sr4440 mentioned, which heads?
March 11, 2018, 12:46 PM
A39Coronet
For my racecar, I used to use AR3934 and AR3933, until I switched to a comparable NGK plug. Very affordable if you buy in bulk from Advance Auto with coupon codes.

Aluminum headed 400 @ 12:1 comp, worked well with both 110 and E85.
March 11, 2018, 07:13 PM
sr4440
quote:
Originally posted by TD6297:
quote:
Originally posted by Duane:
it has been many years since I ran gas that I simply don't recall what plug number I used. I am thinking J 12 Y champion but hoping some one has info so I can fire it up.


Iron heads do use the short reach plugs like the J12Y. I'm not sure about the TF or Indy but I know that Eddy heads are a long reach. So as sr4440 mentioned, which heads?


FYI the 440-3 engine (motor home) uses a 5/8 tapered seat RV9YC. So knowing which head he has would be helpful.

Joe

This message has been edited. Last edited by: sr4440,


Without data, you’re just another guy with an opinion.
March 11, 2018, 08:10 PM
Tom H
NGK-XR5/3332 on "most" steel heads, NGK-4554 (5671A-8) on aluminum. These are a good choice on each given type of head.
March 12, 2018, 01:50 PM
TD6297
quote:
Originally posted by sr4440:
quote:
Originally posted by TD6297:
quote:
Originally posted by Duane:
it has been many years since I ran gas that I simply don't recall what plug number I used. I am thinking J 12 Y champion but hoping some one has info so I can fire it up.


Iron heads do use the short reach plugs like the J12Y. I'm not sure about the TF or Indy but I know that Eddy heads are a long reach. So as sr4440 mentioned, which heads?


FYI the 440-3 engine (motor home) uses a 5/8 tapered seat RV9YC. So knowing which head he has would be helpful.

Joe


wow, I have never seen that, that is very interesting. Show even more that the actual head style is necessary