Just wanted to post some very VITAL information you SHOULD KNOW about our 4V intakes.
You guys should be aware of the casting numbers on your intake or if you are going to purchase an intake since this is VERY important and could be detrimental to the final perfomance of the intake on your motor.
First off, there are several version of the 4V intake for the C-head.
1. 1999 Cobra NON-FIXED. This is the nasties, rough and restrictive of all the castings. Its easily identified by the last 2 casting letters of:
"AC" or "AD"
If you are going to purchase a core to get ported or an engine swap or Turbo swap you MUST stay away from them. Even after ported, the performance will NOT be as good as a ported "fixed" manifold. Lately, I have received about 5 of these "un-fixed" intakes!!!! Have the seller send you the casting number or a pic of it, and if they are not fixed units stay away! I'm NOT going to accept non-fixed intakes any longer so if you send me one Im going to send it back!
2. 1999 Cobra FIXED. These are better flowing manifolds, but not as good as 03-Up intake castings. These have been "fixed" by Ford via 2 methods: Extrude Hone proccess and Acid dipping proccess. The Extrude Hone and Acid Dipped could be identified very easy by the following:
Extrude Hone: Last 2 casting letters have been grinded and engraved by the letters - "BA" , and a "BLUE" Dot at the front of the intake (usually in the driver side).
Acid Dipped: Last 2 casting letter have been grinded and engraved by the letters - "AE", and a "GREEN" Dot at the front of the intake (usually in the driver's side).
3. 2001 Cobra Intake. The 01 intakes are a much improved version over the non-fixed units but still not as good as the 03-up cores. These utilize the same casting mark as the 99-Fixed Acid Dipped intakes, but instead of "grinded" they are actually casted. They still utilize the "Green" Dot as well. Look for the last 2 letters of:
"AE"
4. 03-Current Intake (Mach 1, Maraunder, ect.). These are the BEST castings available. They actually utilize a dedicated mold to cast the runner entrance (where the older version is all one mold), this dedicated mod creates the cleanes, larger and radioused (SP?) runner entrace, the runners are very clean and flow the best. These are identified by the following:
"AE" Casting Letters (like the 2001 intakes), BUT with a GREEN and BLUE Dots as well as the casting date of 2002-Up on the casting decal at the bottom of the intake.
Naz my intake has a BA on the passenger side flat spot on the top front of the intake. Is that the letters we are supposed to be looking at or is it on the bottom?
____________________________________
1999 Electric Green Cobra (gone and dead)
Bassani catted X
let the mods begin
glad to know ANOTHER reason the mach's are a little quicker...
____________________________________
Hamilton
2001 Performance Red Cobra (#2)...2712 of 3867 Born August 3, 2001
-Solid Axle w/ 4.10's, JLT RAI, Tune, MGW Shifter, SSV Mod, Accel Pedal Mod, Mac O/R H pipe, Borla SS Catback, Nitto DR's, 03 Cobra AL Flywheel
-Coming attractions: Control Arms
2002 Black Grand Prix GT...OK shift kit and 12" brakes
Formerly
-2001 Performance Red Cobra (#1)
-1999 Electric Green Cobra
-1995 White GT
So how many cfm's does one of your port jobs bump up a 99 or 01 intake Naz?
+1...
do they get us significantly closer to the cfm's of the 03+ intakes?
____________________________________ 2001 True Blue Cobra---1 of 229 made!!! #1836 of 3867 --- Born on date.....6-22-01 Mods/Upgrades: Motive 4.30's, MMFLSC, BF IRS Brace, NAZ-ty P/P lower intake, SCT X-Cal II -- w/pre-loaded tunes from Don@LaSota Racing
MRT SS Catted H pipe, SLP SS catback with MAC Mufflers, Energy Suspension poly motor/transmission mounts, JLT CAI
MGW Orange Shifter, Eibach Pro-Kit Springs, Bilstein shocks/struts, Steeda X2 ball joints, JLT Pre-filters, Prothane end links
18x9/10 Chrome Saleens - 265/35 Toyo T1R's front, 285/35 Michelin Pilot Sports A/S rear, Goodridge SS brake lines, Hawk HPS front & rear pads, more to come!!!!
Awaiting install - Someday '09 MM C/C plates, Spec Stage 1 Clutch Kit, 04 Alum Flywheel!!!
2006 Super Black Nissan Altima 2.5L S - - w/Special Edition Package - - my DD...
Definition of a "COBRA" - - "A VENOMOUS SNAKE THAT IS NATIVE TO OWNING YOUR ASS ON ANY ROAD......"
Last edited by BlueVenom01; 01-18-2008 at 01:24 AM.
I've run numbers on several intakes by the engineering #'s that are cast and also by the plug #'s and they're all over the place, ranging from 98gt's - 01 v6's.......
Seems like if correct, and you're saying it is, that this is the information that several Ford Parts Managers I know could use...
Naz my intake has a BA on the passenger side flat spot on the top front of the intake. Is that the letters we are supposed to be looking at or is it on the bottom?
They are at the Bottom.
This is what you should be looking for for example:
99 Extrude Honed Intake "BA"
99 NON-FIXED Intake "AC" and casting decal
03-Up "AE" Intake (this one has been "Naz-tyfied"!)
03-Up "AE" casting decal (this one has been "Naz-tyfied"!)
99-"Fixed" ("BA"") Feeder Port. Notice the extreme casting flash around the entrance of the feeder port. Keep in mind that the 99's "extrude honed" intakes STILL had the extreme casting around the feeder ports. The acid dipped DID NOT, just like the "01 AE" castings. The NON-FIXED intakes look just like this one!
This one is a "Fixed, extrude honed" " BA" casting. Notice that the extrude hone proccess DOES NOT address the entrace of the runner (the most important area), it just barely cleaned the intake runners.
These are the same "Fixed Intake" (Extrude Honed "BA") during the "Naz-ty"fication" proccess!
(Keep in mind that there is MORE than its showing......(cant tell all my secrets!!!! )
Another thing that you guys must take into account is that those cores (03-up) may flow better stock for stock, but their castings are much thinner than the 01s "AE" or "Fixed" one, so they allow for less material to be removed.
At the end, any "fixed" or 01-up will be ~equal in power gains/CFMs as the 03-Up.
They ONLY ones that may not "see" such of gains are non-fixed units...but dont dispair. If you sent me a non-fixed that was on your car...you will see huge gains still. If the intake you purchased as a core to get ported and swap with a "fixed" unit...then the gains will be partial.
yet another reason for the myth of "factory freaks" - musta been quite a day when one 99 cobra owner got beat by another by SEVERAL lengths because he still had his non-fixed, while the other got a acid-dipped one!
2001 True Blue Cobra---1 of 229 made!!! 
Mods/Upgrades: Motive 4.30's, MMFLSC, BF IRS Brace, NAZ-ty P/P lower intake, SCT X-Cal II -- w/pre-loaded tunes from Don@LaSota Racing
MM C/C plates, Spec Stage 1 Clutch Kit, 04 Alum Flywheel!!!
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