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Old 02-21-2009, 11:34 AM   #18
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Also, the L99 may have the same heads found on the L76, since that too has AFM. Although the castings are the same as the L92 heads, to save costs the L76 (and possibly the L99) has heavier solid valves vs. the lighter sodium filled L92/LS3 valves.
The AFM gear is in the block, not the heads.
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Old 02-22-2009, 02:49 PM   #19
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Here are some pics of the lifters for AFM/DOD which will be used in the L99:




The LS3 will have normal hydraulic lifters, a different valley cover, and it will not have this in front of the camshaft which is for VVT:

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Old 02-22-2009, 03:46 PM   #20
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i would say if your going to mod it go with the auto, a 3000 stall converter and delete the afm, cam and a tune and you will blow away a 6speed manual with the same cam/bolt on mods
that will be debated. actually it already has been debated.

but to add to your argument, there are a nice group of AFM G8's out there running superchargers as well with no problems.

regardless of which one you go with. they will both be bad ass from the factory as well as with adding mods.
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Old 02-22-2009, 03:51 PM   #21
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that will be debated. actually it already has been debated.

but to add to your argument, there are a nice group of AFM G8's out there running superchargers as well with no problems.

regardless of which one you go with. they will both be bad ass from the factory as well as with adding mods.
at the cost of fuel economy, don't see the point of still having it active, the AFM
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Old 02-23-2009, 09:57 AM   #22
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at the cost of fuel economy, don't see the point of still having it active, the AFM
I dont know what their mpg's are after the sc install, ill have to look into it. but the other thing to keep in mind is that EPA estimates are just that.... estimates.

just like the 4th gens where people were getting 30+mpg in their cars, im sure that both the LS3 and L99 will get better than the EPA estimates
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Old 02-23-2009, 10:02 AM   #23
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that will be debated. actually it already has been debated.
I agree, I take back my statement about the m6 being better to mod from. Might be a little simpler to start with, but in the end, once you get to a cam swap, there isnt that much more to swap out with afm than you would with a normal ls3. Guess its all up to driver preference.
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Old 02-23-2009, 10:16 AM   #24
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I agree, I take back my statement about the m6 being better to mod from. Might be a little simpler to start with, but in the end, once you get to a cam swap, there isnt that much more to swap out with afm than you would with a normal ls3. Guess its all up to driver preference.
camming the L99 will be a little trickier as you have to allow some leeway with the AFM and the lifters. now if you tune it out and remove all that stuff and basically convert to an LS3, then cam swap to your hearts content
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Old 02-23-2009, 10:25 AM   #25
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Well, I'm not sure if anyone is making a cam right now thats compatable with AFM. I would think with the l99, if you are going to cam it, youre going to have to take out the AFM, which is a couple more parts than doing a cam swap on a ls3, but really not that much more labor.
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Old 02-23-2009, 10:27 AM   #26
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The only thing I am concerned about with the L99 are the cylinders wearing out quicker over the years on one side than the other and how that will affect things ten years down the road..
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Old 02-23-2009, 03:19 PM   #27
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Well, I'm not sure if anyone is making a cam right now thats compatable with AFM. I would think with the l99, if you are going to cam it, youre going to have to take out the AFM, which is a couple more parts than doing a cam swap on a ls3, but really not that much more labor.

depends on how big of a cam you are going with.
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Old 02-23-2009, 06:18 PM   #28
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The only thing I am concerned about with the L99 are the cylinders wearing out quicker over the years on one side than the other and how that will affect things ten years down the road..
All pistons are always moving. And the fuel/valves deactivate two cylinders in each bank. No worries about wear.
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Old 02-23-2009, 06:22 PM   #29
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All pistons are always moving. And the fuel/valves deactivate two cylinders in each bank. No worries about wear.
This shows how much I know. Thanks for the explanation..
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Old 02-23-2009, 07:00 PM   #30
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All pistons are always moving. And the fuel/valves deactivate two cylinders in each bank. No worries about wear.
yes and no. there is a minute amount of wear to worry about, but only on the cyls that are still firing. however, i dont see it being a big problem at all considering that afm will only be active for ~20% of the time (average)
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Old 03-22-2009, 03:10 PM   #31
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Ok, after reading all this info on the two I am still divided on what to purchase.

First the manual has more horsey's for bragging points but a slower 0-60, but quicker 1/4 mile. Granted I will most likely not be pushing this car over 100 very often, live too close to the state patrol.

Manual will save about a grand

Manual has less weight and fewer parts to break, and is just plain fun to drive, but I'm not keeping this car forever, probably a couple of years or till I get board with it and find something newer & shinier...


Where as....


The Auto cost more, probably prone to failures due to complexity

The Auto is really the daily commuter which this will be for me...though this car is hardly a commuter

The Auto does have Tap shifts so that could alleviate some of the manual shifting needs I would have.

The Auto has remote start...Pointless gimmick IMO that I could easily do without.

Autos generally have better resale as a majority of women prefer not to shift. (Insert your own Freud reference here.)


I originally wanted a Manual 'cause... it's a manual... and this is a car to race...but then I teetered to the Auto as I wont be racing often and I can let my female friends drive it and I'm sill under the impression Autos are better in the winter, though my best friend disagrees. He wants me to get a manual but he's biased. One female friend suggests the Auto, the other the manual, and the third says it's up to me. I love her Sigh...

Anyway....not that any of you care what I get after all this blatherskite. I still would appreciate any more incite on these two engines.

That and I just needed to vent on what is seemingly a simple decision. Now if I would just grow some balls and choose.

The only mods I plan on are the CAI and probably an X-pipe with obnoxious loudmouth exhaust...oh and maybe a tuning re-flash if necessary.

Last edited by Rahn; 03-22-2009 at 09:26 PM.
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Old 03-22-2009, 03:32 PM   #32
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That and I just needed to vent on what is seemingly a simple decision. Now if I would just grow some ball and choose.

The only mods I plan on are the CAI and probably an X-pipe with obnoxious loudmouth exhaust...oh and maybe a tuning re-flash if necessary.
grow some ball? must be a big one if you only need one....


seriously tho, either one will be a great car. both will respond well to mods. if all you are planning is intake/exhaust and using the car as a commuter with other people who might be driving the car, I suggest the auto. I know the old addage goes "more parts = more parts to break" and thats very true, but it shouldnt scare you away from the auto. I say flip a coin. heads= auto, tails= manual. and if it lands on edge, you have to give me your car.
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Old 03-22-2009, 09:36 PM   #33
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grow some ball? must be a big one if you only need one....


seriously tho, either one will be a great car. both will respond well to mods. if all you are planning is intake/exhaust and using the car as a commuter with other people who might be driving the car, I suggest the auto. I know the old addage goes "more parts = more parts to break" and thats very true, but it shouldnt scare you away from the auto. I say flip a coin. heads= auto, tails= manual. and if it lands on edge, you have to give me your car.

Nope not a horse Need two, always carry a spare..
(S added now)

So...let fate decide...not a bad Idea, that should confuse the dealer.
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Old 09-18-2010, 04:16 PM   #34
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so a year later, how are the LS3 V L99 camparing.
Wow, I started this thread 3 months before I got my Camaro back in February of 2009.

Now (1 1/2 years later) its pretty obvious that the LS3 M6 has an advantage over the L99 A6. It's mostly in the 80mph+ range. The L99 A6 will usually beat an LS3 M6 off the line and up to about 60mph. Then the LS3 M6s power advantage will take over. By about 80mph or so, the LS3 will be passing the L99 and end up beat it by a couple tenths or so in the 1/4 mile.

That's based on a SKILLED DRIVER behind the wheel of the LS3. With the average Joe behind the wheel, the L99 A6 will win most drag races mostly because its easier to launch and it gets off the line faster on average.

But all the L99 needs is a tune. The L99 A6 is truely a high 12 sec car with just a tune. Without a tune, its more of a low 13 sec car. The LS3 M6 is truely a high 12 sec car with a skilled driver.
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