Spark plugs

Philip Saran · 08-24-2007, 08:42 PM

History on this car is a little vague, I bought it a month ago and everything is a learning curve. Yes this is a bracket car.

1974 Duster 383/727/4:56 the 383 is a 10 to 1 flat top motor, solid cam, 10" convertor
It had a Holley 750 DP, but when I got it that had been replaced with a 650 Holley DP.
I'm shopping for another Holley 750 DP carb for it.

Ok the plugs are Champion J12YC in it now.

Looking for recomemdations, opinions, suggestions on a good plug to try.

I made the mistake of going to my local Pepboys (somewhat better than Autozone) and
asking for a set of these plugs, of course the answer was NO GOT, how about a set of
AC Delco plugs computer says a straight match up.

Chris DeGidio · 08-24-2007, 11:24 PM

I use Denso W16P-U in my 383 and 440 engines.I also use Accel,but I cannot remember the number on them.The Accel plugs are made by Denso.The W16P-U is equal to a Champion J-11-Y.

Philip Saran · 08-25-2007, 12:23 AM

Chris, thanks for the reply. Guess I should have just emailed you direct
in the first place.

08-24-2007, 08:42 PM	#1
Philip Saran Senior Member Join Date: Oct 2006 Location: Parker, CO. Posts: 727 Likes: 160 Liked 14 Times in 11 Posts	Spark plugs History on this car is a little vague, I bought it a month ago and everything is a learning curve. Yes this is a bracket car. 1974 Duster 383/727/4:56 the 383 is a 10 to 1 flat top motor, solid cam, 10" convertor It had a Holley 750 DP, but when I got it that had been replaced with a 650 Holley DP. I'm shopping for another Holley 750 DP carb for it. Ok the plugs are Champion J12YC in it now. Looking for recomemdations, opinions, suggestions on a good plug to try. I made the mistake of going to my local Pepboys (somewhat better than Autozone) and asking for a set of these plugs, of course the answer was NO GOT, how about a set of AC Delco plugs computer says a straight match up. __________________ Phil Saran Parker, Colorado

08-24-2007, 11:24 PM	#2
Chris DeGidio Member Join Date: Jun 2007 Posts: 364 Likes: 8 Liked 2 Times in 2 Posts	Re: Spark plugs I use Denso W16P-U in my 383 and 440 engines.I also use Accel,but I cannot remember the number on them.The Accel plugs are made by Denso.The W16P-U is equal to a Champion J-11-Y. __________________ Nautilus Racing

08-25-2007, 12:23 AM	#3
Philip Saran Senior Member Join Date: Oct 2006 Location: Parker, CO. Posts: 727 Likes: 160 Liked 14 Times in 11 Posts	Re: Spark plugs Chris, thanks for the reply. Guess I should have just emailed you direct in the first place. __________________ Phil Saran Parker, Colorado