Good DOHC Article.

[RacerX]

It's from 2004, but, very informative for those that don't know the differences, etc. http://www.mustang50magazine.com/techarticles/m5lp_0412_ford_four_valve_head _information_guide/

[SC Cheesehead]

Hadn't seen that article before, thanks for posting, Bill! :up:

[WhatsUpDOHC]

Yes, thanks!

[Vortech347]

Good find.

[J-MAN]

Nice read, thanks for posting!

[JOEMERC]

Very informative,good find.

[na svt]

A blast from the past.

[maineiac]

good sheet thanks

[guspech750]

That's a good write up. Even touched on the blue mark on the revised head.

Didn't a member here ask about the infamous blue mark? And then was told it was just a myth?


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[RacerX]

Yes, the "Blue mark" is a myth. I have a recent article somewhere that explains all the differences and all the actual head casting numbers and date codes. I'll see if I can dig that back up.

[guspech750]

Yes, the "Blue mark" is a myth. I have a recent article somewhere that explains all the differences and all the actual head casting numbers and date codes. I'll see if I can dig that back up.

In the article it states that it not a myth. On page 6. Said all revised heads had a blue mark.


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[RacerX]

Article fwom twotousandfo, little gwasshoppa. It has been since proven.


In the article it states that it not a myth. On page 6. Said all revised heads had a blue mark.


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Ahhhhh, here we go: http://www.stangshiftergaskets.com/2003_2004faqs.htm#_Toc35092316

Question: "I have a blue stripe on the driver side head. Does it mean that the head was replaced by the dealer or at the factory to fix the tick issue?"
Answer: "

This is a question that has been tossed around more than a mixed salad. The popular rumor is that the blue stripe means that the head was replaced by the dealer (or at the factory) to fix the tick issue. First, some facts. The tick issue is not common, but it can occur on any 2003 or 2004 4.6L DOHC engine (Cobra, Mach 1, etc.). The latest head (the one that fixed the tick issue) wasn't released until 01/2005. Second, the blue stripe has appeared on 2003 and 2004 Cobras/Mach 1s from the factory, and it has appeared on both the driver side and passenger side heads. So it has no correlation to the tick issue fix.
As far as what the blue stripe means, JB from SVTPerformance.com belongs to a local Cobra club and they toured the factory a few years ago. This was the explanation given at the factory. "Assembly plants use just-in-time inventory, meaning parts are not stored up but are delivered daily. The paint markers provide a visual confirmation of when particular batches have been purged from the line. They show up on other Ford engines besides the '03/'04 Cobra. The bottom-line is that the blue stripe doesn't mean a head has been replaced by a dealer". Here's a history of the '03-'04 Cobra heads. Thanks to Joe G. (Jrgoffin on SVTPerformance.com). These are the casting numbers on the actual heads. The actual part numbers are different. It get confusing. As Joe says, "The engineering numbers I listed above can be close to the actual part numbers, but it's usually confusing no matter what. Adding to that, FRPP gets in the mix and then they create yet another part number!! Again, guys have to look at the engineering/casting number to know what head they have".
The 2C5E-6C064-AF & AG castings were the earliest heads, with 4 plug threads. Some have the blue paint, some do not.
The 2C5E-6C064-DA head was the first update to the driver's side (also with 4 threads). Some have the blue paint, some do not.
The 2C5E-6C064-DB head came out for 2004 and had nine plug threads.
The 2C5E-6C064-DC head was the final 2005 revision and also the FRPP head."