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Old 11-23-2004, 10:22 PM   #1
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GT40X flow numbers...why are they different from FMS?

from http://www.fordracingparts.com/parts...tKeyField=2603

Intake flows approximately 240 cfm at .550" lift (at 28" of H20)

Exhaust flows approximately 170 cfm at .500" lift (at 28" of H20)

but when looking at http://forums.stangnet.com/showthread.php?t=334773 and http://www.allfordmustangs.com/Detailed/630.shtml

they list these heads to flow 216@500 214@600 intake and 149@500 exhaust

which one is correct?

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Old 11-23-2004, 10:41 PM   #2
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comparing flow numbers from one bench to another is absolutely pointless, heck just the change in weather conditions alone could easily cause the numbers to be that far off.

If you're considering those heads for some reason, you should really reconsider, unless you're getting one hell of a deal on them.
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Old 11-24-2004, 07:59 AM   #3
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Could very well be that different depressions were used too, some use 28" of water, some use 25" of water and some use 1.5" Mercury (~21" water I think) which will result in different flows.
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Old 11-24-2004, 08:26 AM   #4
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Quote:
Originally Posted by fiveohpatrol
If you're considering those heads for some reason, you should really reconsider, unless you're getting one hell of a deal on them.
Any GOOD reasons absolutely not to get them? Other than the fact that they don't flow quite as well as an AFR?

I'm planning on X's because I don't feel like ending up tearing my motor back apart in 10,000 miles because of head problems. The only one I've ever heard of with X's is valve guides, but I don't expect problems there as I am doing some work to them before I install the heads (HD valve guides, machined for stud mt. &guide plates, etc...)
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Old 11-24-2004, 08:38 AM   #5
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Quote:
Originally Posted by AJMcCurdy
I'm planning on X's because I don't feel like ending up tearing my motor back apart in 10,000 miles because of head problems.
You're never going to buy a set of heads that are "guaranteed" to last 10,000 miles. Horror stories have been dished out on this board for pretty much every head made.

A handful of people out of thousands running AFR heads who have had problems does not make the X a better head.
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Old 11-24-2004, 08:58 AM   #6
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I know that and I'm not saying the AFR has problems. Looks like it's actually one of the more reliable, if you can deal with retapping a hole once in a while. I never even hinted at the GT-40X being a better head than an AFR.

On the same token, I don't see any reason to bash the X's . They're readily available, and for as old as they are they keep up well with most of the aftermarket's "street" heads, and Ford has been supportive and fixed the reliability bugs out of them...

I wasn't going by this board, either, I'm going from experiences in real life.. I've helped tear apart Edelbrocks with valve spring perches pounded out, and don't get me started on TFS.
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Old 11-24-2004, 09:30 AM   #7
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I've had my GT-40X heads and intake on my stang for about 3 years now and have over 25,000 mi on them and have had no trouble with them at all. IMO I think they are great heads, but on the same note I haven't tried AFR's either. I'm usually at the strip 3 times a month running mid to high 12.6's, depending on the weather. The numbers that you show look correct, its been quite a while since I looked at them to see for sure.
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Old 11-24-2004, 11:33 AM   #8
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I was just saying that because I've never seen a GT40X headed car running that strong at the track. I'm sure they're are a few, with some port work, but from what I've seen there are much better heads out there for the money.
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Old 11-24-2004, 12:31 PM   #9
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Quote:
Originally Posted by mustanggt95
I've had my GT-40X heads and intake on my stang for about 3 years now and have over 25,000 mi on them and have had no trouble with them at all. IMO I think they are great heads, but on the same note I haven't tried AFR's either.
I have 3 years and 25K on my AFRs with a much more agressive cam than that E cam, so I don't think reliability is an issue. (Even got up to 27 mpg on my last road trip, so that's not bad either).
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Old 11-24-2004, 12:37 PM   #10
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I like my gt40x heads low comp 64cc got 12.7's on the motor and 11.90's on a 100 shot and thats with a truly stock 88 ho cam

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Old 11-24-2004, 01:26 PM   #11
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That's more like it... My goal is solid 12s on motor with X's and a ported intake. (and a TKO500 and slicks, I'm hurting BAD for traction).
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Old 11-24-2004, 02:19 PM   #12
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I ran 12's and 11's with bfg drag radials too
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Old 11-24-2004, 02:23 PM   #13
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just read your mods how is that 2031 cam??
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Old 11-24-2004, 04:53 PM   #14
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You can easily run 12's with X-heads. If you get the right deal on them go for it. No they won't make as much power as the AFRs, but they'll be a heck of alot cheaper. Besides out of all the alum heads on the market AFR does not make the most HP per $.
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Old 11-24-2004, 05:01 PM   #15
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Last time I dyno'ed I showed nearly the same numbers down low with high end increases, didn't fall off until well past 5200 RPM as opposed to peaking at 5000 with a stock Cobra cam. I was impressed by the top end gains with no bottom end losses at all, even TQ.

As for drivability, it sounds very similar to an E cam. (surprise surprise, same exh. duration). A little more lope though, especially before the idle settles. Strangely, the thing bucks if you idle through a parking lot in 1st gear, but not in 2nd.

Overall I would recommend this cam to almost anyone, but some of the antics of the lope can get a little old in traffic if you have a daily driver.
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