Spark Plugs
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Senior User
Joined: Sep 2005
Posts: 169
Likes: 0
From: Nuevo Laredo/Laredo Tx.
Spark Plugs
Hi folks I need an advice on changing the spark plugs on my 1977 F-150 Supercab, The engine is the 400 6.6 Ltr. 2 barrell. I wanna know if I should stick with the brand that I've been using since forever (Motorcraft) or how recommendable it is to use other brands since there's so much out there nowdays like BOSCH, Champion, NGK, ACDelco, and all those types like 2 platinum and all that stuff. The dealer recommended Motorcraft ASF42, I've been using Motorcraft AWSF52C, what would you recommend? Thanks for your answers!!
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
You're not going to see much difference. A spark plug makes a spark jump across a gap of air. Pretty hard to mess that up or improve it. Don't waste your time on the hype; stick with what works and gap to spec. Autolite\Motorcraft will be fine.
Elder User
Joined: Feb 2008
Posts: 640
Likes: 1
From: US/Baja border
I've had bad luck with Champion, stick to what you've been doing. Those fancy tips don't seem to do much of anything but the platinum tips seem to resist oil fouling better, NOT good, just better.
Elder User
Joined: Jun 2007
Posts: 679
Likes: 1
From: Memphis, TN
i used the E3s in my dads yoda and the were awesome! lasted about a year on a carb that was DUMPING fuel. too bad 4 of 'em was like $30
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Post Fiend
Joined: Apr 2008
Posts: 8,261
Likes: 15
From: Big Sky Country
I wouldn't use Autolites any longer since they are now made in China, anyone know if the Motorcraft plugs are still made in the USA?
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Elder User
Joined: Dec 2007
Posts: 739
Likes: 1
And yes...We always use NGK V-Power. Not to spendy, looks pretty cool LOL..And the truck runs good on 'em.
S-
Postmaster
Joined: Jul 2001
Posts: 4,956
Likes: 10
From: MD
Ordered some ASP32P, they are made in USA.
Posting Guru
Joined: Jun 2004
Posts: 1,133
Likes: 3
From: Dracut, Massachusetts
next time i change my plugs i think im going to use the e3 ones. i've been using autolite platnum, but the last time i did my plugs one of them snapped in half. scared the bujesses outa me. i thought i was going to have a problem getting it out.
Senior User
Joined: Mar 2007
Posts: 499
Likes: 0
From: Erie Pennsylvania
What plugs do you guys think I should use for my 351 that I built up to a 408 with a hyrolic roller cam? Do you think I should go with a different/hotter plug, or should I stick with the origionals. Also, what are the origionals from motorcraft supposed to be?
Thanks
TheBlueMule
Thanks
TheBlueMule
Senior User
Joined: Jun 2007
Posts: 239
Likes: 0
The theory of sparkplugs is that the spark likes to transfer from one sharp point or corner to another which is the reason over time they where to rounded look wearing of these corners, hence the v-groove and splitfire design promoting better spark transfer and longer life with more sharp edges. I have used autolite for years and only now are trying the NGK's. We'll see I guess