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Apr 1, 2024 | 11:51 AM

#16

Rubiranch

Logistics Pro

Joined: Jun 2004

Posts: 4,715

Likes: 3,321

From: South Central Utah

Here's my choice for spark plugs and spark plug wires.

I've never cared for colored spark plug wires.
I just like the way they look.

Apr 1, 2024 | 01:43 PM

#17

Ericfromfrance

Thread Starter

Mountain Pass

Joined: Aug 2021

Posts: 144

Likes: 21

Quote:

Originally Posted by Rubiranch

Here's my choice for spark plugs and spark plug wires.

I've never cared for colored spark plug wires.
I just like the way they look.

what about the gap ? I read 0,043 inch is it correct ?

Apr 1, 2024 | 03:38 PM

#18

redroad

Lead Driver

Joined: Nov 2006

Posts: 5,217

Likes: 506

From: Pa.

Apr 2, 2024 | 02:57 PM

#19

FuzzFace2

FTE Legend

Joined: Nov 2015

Posts: 30,831

Likes: 4,096

From: Angier, NC

Quote:

Originally Posted by beardedcap

I wouldn't recommend platinum or iridium with a stock ignition system. I'd go autolite 25s or the copper version of the motorcraft

Quote:

Originally Posted by beardedcap

Well honestly it's mostly anecdotical. I know copper has a lower resistance, so theoretically better for an older ignition system using oil filled coils. But I have had a buddy use some iridium tips in even an eec-iv truck and it was running like, ****, fouling plugs very quickly, etc. I'm not sure what or if he'd gapped them but we went and got some copper plugs and it ran fine. I've also read a few times online to use copper, but like I said it's all anecdotal.

I have also seen the same thing in the 80 - 86 truck area.
Some have no issues running them fancy plugs yet others do?
Some as soon as they install them or soon after.
When you see a post on running like crap and you start helping to find out they did a turn up 100 miles ago then ask what plugs they used once they say them fancy ones tell them to replace with copper and all was good again.

My thought is the old ICM just cant handle the load needed to fire the fancy plugs.
So why spend all the money on plugs that were not meant for our motors and may have to be changed out for the copper one?
Dave ----

Apr 2, 2024 | 06:33 PM

#20

cb_13

Fleet Mechanic

Joined: Jul 2010

Posts: 1,509

Likes: 116

From: St James, Missouri

I put some NGK V power plugs in my 460. So far, so good. Definitely runs better than with the fouled Autolites that came out. They were cheaper than Motorcraft and shipped from the same warehouse as everything else I was ordering from Rock Auto. Sometimes I’m annoyed by playing that game with Rock Auto but I’ve never had an issue with NGK plugs.

Apr 3, 2024 | 09:11 AM

#21

ford4x477

Mountain Pass

Joined: Apr 2021

Posts: 140

Likes: 12

From: Bay Area

Hello Ford Community,

Since we are talking spark plugs can I ask you all the recommended 390 engines? In my setup, I have, as I mentioned, 390 and still have points.

Thank you,

Apr 3, 2024 | 05:35 PM

#22

FuzzFace2

FTE Legend

Joined: Nov 2015

Posts: 30,831

Likes: 4,096

From: Angier, NC

Quote:

Originally Posted by ford4x477

Hello Ford Community,

Since we are talking spark plugs can I ask you all the recommended 390 engines? In my setup, I have, as I mentioned, 390 and still have points.

Thank you,

Go to the local parts store and ask for copper plugs for your year motor and they will hand you what you need.
If you find the motor is burning oil and fouling plugs you could ask for 1 step hotter plug.
If you have run on and the idle speed is set to factory or get pinging / spark knock and timing is also set to factory you may want to go a step colder.
My .02
Dave ----