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So I ordered Motorcraft Spark Plugs for my 2001 SVT Cobra (using my VIN to get correct part) and here is what I got:

Motorcraft SP-433 AGSF32WM Platunum

When I pulled the plugs from the block to change, I noticed the plugs appear identical (overall length, size, gap) but had a much shorter cut thread length overall on the barrel shaft. The old plugs had a different part number too:

Motorcraft AWSF 32E Platunum

The plugs appear identical, but the old threads maybe go up from the bottom 1/2" until a smooth taper and the new ones go up probably a full 1" to the plug taper.

I called Ford thinking I have the wrong plugs. They confirmed the AWSF 32E plugs were the original plugs and part # for this car but were superseded by the AGSF32WM plug. Normal - parts change a lot.

I explained the concern and they checked, double checked, and triple checked that the new part was proper for my car. They transferred me to a 'specialist' and he confirmed the new plug number and said the reason for change is that plug is used in multiple cars now most likely. Since the block is tapered, the plug will go in and stop (which it did I confirmed) and some threads would stick out the top of the block. The important thing was since the block is tapered, the plug will still only go in the exact same amount and everything will be fine.

Anyone else see this, or changed to new Motorcraft plugs recently? These are supposed to be plugs for 99-04 Cobras.
 

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I thought that the extra threads were added to eliminate them from backing out. I have read about the precautions needed when removing & installing plugs.
4.6L DOHC Engine SPECS for reference:
Common 4.6L & 5.4L Engine Issues

• Spark plugs stripping cylinder heads: 1997 - 2008 modular engines have a history of stripping the threads for the spark plugs in the cylinder head. The cylinder heads are made of aluminum, a much softer metal than steel, and the spark plugs are only held in place my a few threads. This combination makes it easy to strip the cylinder head during spark plug removal or replacement. Additionally, it is not uncommon for a spark plug to blow out, stripping the heads. This defect is acknowledged by Ford Motor Company as multiple TSB's (technical service bulletin) relate to this issue. A threaded insert is the recommended repair method, & Ford provides a tool kit specifc to this repair procedure.
• Composite intake manifold cracking: 1996 - 2001 Ford 4.6L & 5.4L engines a nylon composite intake manifold produced by DuPont. The intake manifold is prone to cracking, which results in coolant leakage. Ford began installing a revised intake manifold late in the 2001 model year to prevent this issue. A class action lawsuit was filed in behalf of Ford owners and later settled. Owners of problematic model year cars & trucks were elegible to receive an updated intake manifold within 90 days of the settlement.

Ford Modular 4.6 L Specifications EngineGuy
 
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