Moparts

need advice from any iron head racers

Posted By: moparmattkos

need advice from any iron head racers - 05/02/09 02:25 PM

I am lookin to see what plug you guys run in closed chamber iron 915 heads for racing. I dont think the rj12 will do the trick for what i want. I will spray a 150 shot on this sometimes also but id like to know some plug recomendations for both . Thanks for your help guys!!
Posted By: blownzoom440

Re: need advice from any iron head racers - 05/02/09 02:48 PM

i am using an NGK #8.i can get the stock # to order later.sorry.
edit: thye stock # is 3354 part # R5670-8 for my 346 heads.
Posted By: moparmattkos

Re: need advice from any iron head racers - 05/02/09 08:37 PM

Quote:

i am using an NGK #8.i can get the stock # to order later.sorry.
edit: thye stock # is 3354 part # R5670-8 for my 346 heads.



What is your combo? Nos , blower , or N/a??
Posted By: blownzoom440

Re: need advice from any iron head racers - 05/02/09 08:47 PM

boosted,about 15.5to1cr total,sunoco 110,7AL-2 pro coil,firecore 50 wires.30* timing.
Posted By: Supersonic

Re: need advice from any iron head racers - 05/02/09 11:38 PM

I run auto lite 75 in mine. it has shaved and ported 915 heads and runs 10.30's. I have 24 runs on this motor without changing any of the plugs yet, they seem to do the job. I know a lot of people hate auto lite's but i've always had good luck with them so i've never changed.
Posted By: Cab_Burge

Re: need advice from any iron head racers - 05/03/09 02:35 AM

Try a Autolite AR73 or AR72, or a Champion J63Y or J6YC and or Accel 132
Posted By: eds dart

Re: need advice from any iron head racers - 05/03/09 03:03 AM

I,ve been using Accel 134 for a couple of years now. 906,s 14 to 1 alcohol. Never had any issues.
Posted By: wildcargo

Re: need advice from any iron head racers - 05/03/09 12:21 PM

When the motor had 915s on it we ran AR73 gaped at .035.I like the cut back electrode on the AR plugs I think there is less chance of detonation with that style plug.
Posted By: moparmattkos

Re: need advice from any iron head racers - 05/04/09 03:31 AM

I went to the local parts store and they crossed over the ar73 to autolite 85's will these work ok?
Posted By: Cab_Burge

Re: need advice from any iron head racers - 05/04/09 03:44 AM

Quote:

I went to the local parts store and they crossed over the ar73 to autolite 85's will these work ok?

Absolutely not, a 85 is a resistor plug that has the same heat range as the non resistor Autolite # 75 A 83 is the same heat range as a 73
Posted By: qwkmopardan

Re: need advice from any iron head racers - 05/04/09 04:17 AM

Champion H8C. Should be easy to get. Oreilly Auto Parts stocks them. That is what I run in Iron head big blocks. Got them in the Lebaron right now with 915 heads. Dan
Posted By: moparmattkos

Re: need advice from any iron head racers - 05/05/09 04:25 AM

Quote:

Champion H8C. Should be easy to get. Oreilly Auto Parts stocks them. That is what I run in Iron head big blocks. Got them in the Lebaron right now with 915 heads. Dan



I went to all the local parts stores no one keeps this plug either. They told me that c this plug crosses over to a autolite 216???? Dan is your motor n/a or a power adder? will these work and what about a little 175 shot on it???
Posted By: moparmattkos

Re: need advice from any iron head racers - 05/05/09 01:23 PM

Posted By: afxcoronet

Re: need advice from any iron head racers - 05/05/09 01:36 PM

We run the NGK 5670-9 on our
Alky Injected 14-1, Iron headed 440, Use PN 3913 to order through O'Reilly's.
Posted By: moparmattkos

Re: need advice from any iron head racers - 08/15/09 05:00 PM

More info The motor is a 451 stroker about 11 to 1 with a 590 cam 915 heads and a 4500 converter in a 3000lb car with a very occasinal 150 shot of nos.
Posted By: 70dusterjohn

Re: need advice from any iron head racers - 08/15/09 05:21 PM

We ran Auto lite 74s in both the 915 and the Max wedge heads. We did use a 150 shot on my buddies 440 with 915s and using the 74s.. I think that they changed the number on it but they can cross it for ya.. oh his is a 496... 12.5 comp soild mop cam 590 lift single carb 1050 dom. Hope this helps ya.
Posted By: moparmattkos

Re: need advice from any iron head racers - 08/16/09 07:39 PM

Are those ar74's or just the 74's??
Posted By: DoubleD

Re: need advice from any iron head racers - 08/16/09 07:59 PM

Used to run autolite 75 or 74 in a 915 headed 511 ran 9.80's in a 3200 lb car - they were cheap and worked - I did try the 85 and 84's never really noticed any difference using a MSD 6Al - the resistence in the plug is negligable.
Posted By: RemCharger

Re: need advice from any iron head racers - 08/17/09 04:02 AM

Quote:

i am using an NGK #8.i can get the stock # to order later.sorry.
edit: thye stock # is 3354 part # R5670-8 for my 346 heads.

These are the plugs you need . Or the -7s,,, If you can wait since may, you can wait to order them?
© 2024 Moparts Forums