4.6L New long thread style spark plugs?

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11-10-2009, 09:32 AM

tomtk3

1st Gear Member

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Join Date: Oct 2009

Location: Michigan

Posts: 53

4.6L New long thread style spark plugs?

I have been trying to find out after what point did they change the plug and head design to eliminate the crimped 2 pc style prone to breakage plugs.

11-10-2009, 10:53 AM

SirKnightTG

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Join Date: Mar 2007

Location: Deep in the <3 of Tx

Posts: 3,925

During mid 2008.

11-10-2009, 01:35 PM

StickShifty

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Join Date: May 2005

Location: New Jersey

Posts: 4,536

mine was built on 2-15-2008 and i have the new plug and head design. if you have a 2009 you are good

11-10-2009, 06:00 PM

BRENSPEED

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Join Date: Apr 2005

Location: IN

Posts: 495

Not to repeat what has already been stated above but, the plug design was changed for mid 2008. If your coil packs are black on top and have a brown boot you have the new plug design, if coil packs are all black, old design.

11-10-2009, 06:11 PM

tx_zstang

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Join Date: May 2007

Location: Central Texas

Posts: 2,388

THe new (brown) coil packs start with '8' while the older (black) ones are '3'. That's what it says everywhere to know what plugs you need.
The newer ones are 12mm and the older ones are 16mm threads.