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Old 05-23-2008, 09:06 AM   #1 (permalink)
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Best Spark Plugs for 408W with Victor JR Heads???

Anyone got a suggestion for the correct plugs to run with a 408W w/11.3comp w/edelbrock victor Jr. heads. 800CFM holley. A good starting point would be great.

Thanks
Dan

Last edited by dano610; 05-23-2008 at 10:02 AM.
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Old 05-23-2008, 12:02 PM   #2 (permalink)
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Re: Best Spark Plugs for 408W with Victor JR Heads???

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Originally Posted by dano610 View Post
Anyone got a suggestion for the correct plugs to run with a 408W w/11.3comp w/edelbrock victor Jr. heads. 800CFM holley. A good starting point would be great.

Thanks
Dan
I run the autolite 3924s in mine..
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Old 05-26-2008, 08:30 PM   #3 (permalink)
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Re: Best Spark Plugs for 408W with Victor JR Heads???

A friend just bought a set of pro comp 210 heads , He don't know witch plugs to use in it . Will the Autolite 3924 or 3926 work in them or does he need something elce .
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Old 05-26-2008, 09:36 PM   #4 (permalink)
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Re: Best Spark Plugs for 408W with Victor JR Heads???

my two stangs, I have same heads and my engine builder told me to run autolite ar3933 hope this helps
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Old 05-27-2008, 02:32 AM   #5 (permalink)
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Re: Best Spark Plugs for 408W with Victor JR Heads???

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Originally Posted by MY TWO STANGS View Post
A friend just bought a set of pro comp 210 heads , He don't know witch plugs to use in it . Will the Autolite 3924 or 3926 work in them or does he need something elce .
I used the Autolite 3924's and switched to the 3923's (which is the next step cooler) when I was running that head. The 3923 was what it liked at the strip and the 3924 was good on the street.
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Old 05-27-2008, 01:28 PM   #6 (permalink)
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Re: Best Spark Plugs for 408W with Victor JR Heads

Thanks for the help guys the guy that sold these heads had no clue as to what plugs to use .
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Old 05-27-2008, 04:13 PM   #7 (permalink)
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Re: Best Spark Plugs for 408W with Victor JR Heads

3933 always worked the best with the Victor Jr's we used, on very similar engine builds.
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Old 05-27-2008, 08:20 PM   #8 (permalink)
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Re: Best Spark Plugs for 408W with Victor JR Heads

This is intresting I have been using the 3924 plugs in my 331 stroker with JR heads since the engine was first built . I think I will try a set of 3933 plugs the next time i take it to the strip . Two back to back passes willl tell me what will work the best . Good to hear every bodys opinion ,I turn my engine to 7500 so I may need a cold plug .
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Old 06-23-2008, 04:03 PM   #9 (permalink)
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Re: Best Spark Plugs for 408W with Victor JR Heads

I stoped at my local UAP NAPA saturday to pick up a set of AUTOLITE 3933 plugs for my 331 . My dealer says that he has no such listing there is a 3922 , 3923 ,3924 and 3926 but no 3933 is that a printing mistake or is he short on info.

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Old 06-23-2008, 06:18 PM   #10 (permalink)
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Re: Best Spark Plugs for 408W with Victor JR Heads

I'm using Autolite 3924's as well on mine. Seems to be ideal.
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Old 06-23-2008, 06:37 PM   #11 (permalink)
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Re: Best Spark Plugs for 408W with Victor JR Heads

3924's
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Old 06-25-2008, 06:39 PM   #12 (permalink)
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Re: Best Spark Plugs for 408W with Victor JR Heads

I hate to tell everyone this, but the N G K plugs will make more horsepower. It is a fact. THe V groove are the ones to get. I dont know how hard they are to buy, but every time someone comes in and wants to do a comparision test, the NGK always win TOO BAD

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Old 06-26-2008, 12:19 AM   #13 (permalink)
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Re: Best Spark Plugs for 408W with Victor JR Heads

Thanks Joe, I'll have to try some of those. NGK's have worked well on alot of cars I have heard. I know I had a 93 Mazda MX-3 (V-6) that needed the spark plugs replaced. Ended up buying some Autolite's for it doing my own tuneup. Car seemed to have a hesitation after I installed them. Figured I had brand new plugs and that could not be the problem with the hestitation.....and thought it was something else. But after 2 trips to the dealer to fix the hesitation problem, they finally replaced the plugs with NGK's. Car ran great after that. Thought it was just the quality of the NGK's versus the Autolites. Anyone know the part # of the equivalent NGK's to replace the Autolite 3924's?? Thanks.
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Last edited by Spali32; 06-26-2008 at 12:22 AM.
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Old 07-07-2008, 09:07 PM   #14 (permalink)
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Re: Best Spark Plugs for 408W with Victor JR Heads

Racing Spark Plug Cross Reference Chart for Autolite, NGK, AC Delco and Champion
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