Stock 2000 GT Cam Specs.. HELP!!! - Mustang Evolution

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Old 02-20-2012, 01:38 PM   #1
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Angry Stock 2000 GT Cam Specs.. HELP!!!

Okay, so I have a 2000 GT. I'm fairly certain that the cam and internals are stock. Anyways, I haven't been able to find any super reliable info on the net about stock specs. I'm trying to figure out Valve Lift for the exhaust valves. So far here's what I've found. Stock cam lift is either 504/531, or 505/534. The stock rocker arm ratio is 1.80:1 or 1.81:1. Using the Valve Lift formula to try to figure out valve lift is giving me this for valve lift:
Lobe lift (exhaust) x rocker arm ratio = valve lift so...

.531 x 1.80 = .9558" valve lift?? I'm seriously doubting this and I would like some clarification. Am i messing up somewhere here? Any help would be great.. basically the whole point of this is I'm trying to calculate proper header primary tube size as close as possible, and for that equation i need valve lift. Thanks again.
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Old 02-20-2012, 01:52 PM   #2
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Re: Stock 2000 GT Cam Specs.. HELP!!!

I would say those lift numbers you found were net lift and not gross cam lift, meaning that's the lift after the rockers are factored in. Stock cams won't ever be that high.
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Old 02-20-2012, 02:37 PM   #3
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Re: Stock 2000 GT Cam Specs.. HELP!!!

See, that's what I was thinking, but I can't seem to find the stock specs anywhere on what the lobe lift is, valve lift, or even if that's the correct rocker arm ratio.. But thank you. Hopefully this can get cleared up.

---------- Post added at 02:37 PM ---------- Previous post was at 01:56 PM ----------

Just found out that the numbers used were 'the actual valve lift' and not lobe lift. Also, when I say 'rocker' I understand that we have rollers, i'm just using the term loosely. I still would like to know lobe lift, and roller/rocker arm ratio. Thanks.
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Old 02-20-2012, 02:45 PM   #4
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Re: Stock 2000 GT Cam Specs.. HELP!!!

Lobe loft is probably somewhere around .295" which equals .531" lift after you multiply the rocker arm ratio in.
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Old 02-20-2012, 02:46 PM   #5
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Re: Stock 2000 GT Cam Specs.. HELP!!!

I see.. is that just reversing the equation, or do you know if that is actual lobe lift? Sorry to be picky... I really appreciate it though!!
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Old 02-20-2012, 03:20 PM   #6
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Re: Stock 2000 GT Cam Specs.. HELP!!!

I just reversed the equation, when I get home tomorrow I can check. I have a book all about the 4.6's and it has all that info in it. I'm pretty sure it's not to far off from that figure though.
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Old 02-20-2012, 03:23 PM   #7
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Found this in my haynes! Hope it helps.
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Old 02-20-2012, 03:30 PM   #8
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Re: Stock 2000 GT Cam Specs.. HELP!!!

There you go, that's probably closer to being accurate. I just used the numbers you had and reversed them to get cam lift. So with those numbers .2594 x 1.8 would be around .466 lift on the valve.
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Old 02-20-2012, 04:10 PM   #9
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Oh, and everything I've found supports the 1.81 or 1.80 rocker arm ratio.
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Old 02-20-2012, 04:52 PM   #10
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Re: Stock 2000 GT Cam Specs.. HELP!!!

Wow!! Thank you very much!! That does help.. i just had someone else say though that they thought rocker arm ratio was around 1.6 ish which is typical for stock vehicles, but I've found more evidence supporting the 1.80 and 1.81 ratio. Now for my next thread I've posted!! LOL

---------- Post added at 04:52 PM ---------- Previous post was at 04:49 PM ----------

Just another quick question, that info was for the 99-04 4.6L right? And in the mustang not any trucks or whatever right? I just gotta ask, sorry..
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Old 03-23-2012, 10:07 PM   #11
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racist gabacho

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