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Chryco's Tech Shop
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Engine & Go Fast Goodies
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Chryco Psycho
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Spark plugs in a 383
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Topic: Spark plugs in a 383 (Read 1061 times)
Cdnchallenger
Jr. Member
Posts: 313
Spark plugs in a 383
«
on:
October 24, 2011 - 06:08:17 PM »
I just picked up a 70 challenger with a 383 that does not run. The car came with both long and short plugs installed. Which is correct or does it depend on heads or pistons etc?
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Chryco Psycho
Administrator
C-C.com Guru
Posts: 36620
70 Challenger R/T SE 70 tube Chassis Cuda now sold
Re: Spark plugs in a 383
«
Reply #1 on:
October 24, 2011 - 06:53:57 PM »
the correct plug is RJ12YC from Champion ,that or the Autolite will make the best power .
The J plugs are short thread , N plugs are long thread , the N plug was used in the small blocks , Hemis & Slant , the B & RB engines use short J plugs
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Challenger - You`ll wish You Hadn`t
Cdnchallenger
Jr. Member
Posts: 313
Re: Spark plugs in a 383
«
Reply #2 on:
October 24, 2011 - 07:11:09 PM »
We are trying to get this engine running. Plugs seem to be constantly soaked in gas so i was worried that I was not getting a good spark . Put longer plugs in and seems to run better. Any thoughts? One good thing that this car has is great compression in all cylinders.
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'Cuda Hunter
Sr. Resident
Posts: 9102
Tastes Like Chicken
Re: Spark plugs in a 383
«
Reply #3 on:
October 24, 2011 - 08:21:18 PM »
Are the plugs still wet?
If your plugs are wet your carb is dumping too much gas.
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"All riches begin as a state of mind and you have complete control of your mind" -- B. Lee
Road_Runner
Sr. Member
Posts: 1825
Mopar Owner & Standard Bearer Since 1974
Re: Spark plugs in a 383
«
Reply #4 on:
October 24, 2011 - 08:43:56 PM »
I've run J11Y's for years in my 383, believe that's what came on the HP 383 motors in 70, but the J12Y's are the current plug since J11Y's aren't made anymore. Either way J is the right series plug and the number is the heat range.
Later, Jim
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1970 383 Roadrunner Tor Red
1973 318 Barracuda Mist Green
2014 Mustang GT/CS Convertible All Black
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Spark plugs in a 383