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9/7/12 9:44pm - Original Message: 'Spark plugs'
rep69
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Chesapeake, VA - USA

Vette(s):
1969 convertible 427 4speed

Joined: 7/24/2012
Posts: 130
I have a set of autolite AP 404 spark plugs that were given to me by the previous owner of my 69 427 390hp. Has any one used these plugs? Would like to know if they are worth keeping for the next tune up
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9/8/12 11:54am - Reply: 'Re: Spark plugs'
Gunslinger
Former Member
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Frederick, MD - USA

Vette(s):
1969 convertible L71 427/435 4-speed black interior

Joined: 9/8/2003
Posts: 3398
I have AC spark plugs in my 427 but realistically, as long as the plug you use is of the right heat range for the application, it really shouldn't matter.  I know many have their own favorites for spark plugs, the fact remains they are all designed to do the same job.

Unless your car has modifications such as cylinder head work, cam changes, etc., whatever meets factory specs is fine.  There's no need to use exotic (read that as expensive) spark plug designs with a stock ignition system.  You'll only make the parts manufacturer richer and see no gain in performance.

As I said, if the Autolite spark plugs are the correct application and heat range, there's no reason not to use them.  Getting them for free is a bonus.


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Poet...Mystic...Soldier of Fortune. As always...self-absorbed, adversarial, c o c k y and in general a malcontent.

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9/8/12 3:05pm - Reply: 'Re: Spark plugs'
aceinthehole Lifetime Member
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Valley Springs, CA - USA

Vette(s):
1978,Metalic Money Green W/Gold emblems,TH350 w/gear splitter,black & grey interior.1978,two tone,Metalic Rootbeer & gold ,Doeskin interior,auto. trans. 1981, Silver w/mirrored T-Tops,4 spd, charcoal interior.

Joined: 11/20/2005
Posts: 3618
 Them's my senaments azackly Thumbs Up.

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Jimmy B.
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9/15/12 11:25am - Reply: 'Re: Spark plugs'
73shark
Standard Member
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 382
I agree that w/ our vintage engines, the right heat range is the most important feature but when the mfgs went to EFI, I found that I got the best results w/ the OEM recommended plugs.

For instance, I found that my engine ran best w/ one heat range hotter and w/ a projected tip.


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1973 L-82 4 spd

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9/15/12 11:42am - Reply: 'Re: Spark plugs'
rep69
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Chesapeake, VA - USA

Vette(s):
1969 convertible 427 4speed

Joined: 7/24/2012
Posts: 130
I am in the process of getting a tune up and my mechanic will only use ac delco plugs. He is installing the rapidfire # 4. The autolites did not cost me anything, so I will keep them for a late time.
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