LS3/L99 Question... - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

str8himalaya · 08-01-2008, 06:10 PM

Are they pretty much the same engine? I mean will the same aftermarket parts (headers, cams, CAI, etc.) going to fit the exact same on both engines? I want a premier engine, but i would prefer the auto w/tapshift as a transmission. Any help?

*The_Blur* · 08-01-2008, 07:05 PM

The last L99 was a slightly modified LT1. I don't know anything about this one.

*GTAHVIT* · 08-01-2008, 07:14 PM

I thought it had been stated they are the same engines save the L99 was modified for AFM?

jmliptak · 08-01-2008, 07:18 PM

There is an entire thread in the Engine section of this board on the L99 and AFM and the implications thereof, as well as any number of other random ramblings (especially the ones from me!):

http://www.camaro5.com/forums/showthread.php?t=5181

It is essentially the LS3 with AFM and associated goodies, it is a 6.2, but there MAY be some issues with modding it, then again maybe not...There is a lot in the thread above>

garfin · 08-01-2008, 07:23 PM

Quote:

Originally Posted by str8himalaya

Are they pretty much the same engine? I mean will the same aftermarket parts (headers, cams, CAI, etc.) going to fit the exact same on both engines? I want a premier engine, but i would prefer the auto w/tapshift as a transmission. Any help?

They are both 6.2 L engines. The L99 is auto only with AFM and has a rev limiter at 6000 rpm.
The LS3 is pretty much the 'Vette engine that is only available with the 6-speed manual... limited to 6600 rpm

They both utilize LS7 heads and larger ports/valves.

Best regardSS,

Elie

Shadowsong · 08-02-2008, 02:02 AM

Quote:

Originally Posted by jmliptak

There is an entire thread in the Engine section of this board on the L99 and AFM and the implications thereof, as well as any number of other random ramblings (especially the ones from me!):

http://www.camaro5.com/forums/showthread.php?t=5181

It is essentially the LS3 with AFM and associated goodies, it is a 6.2, but there MAY be some issues with modding it, then again maybe not...There is a lot in the thread above>

People aren't having problems with their G8GT's, so I think we should be ok.

*TAG UR IT* · 08-02-2008, 02:31 AM

Quote:

Originally Posted by str8himalaya

Are they pretty much the same engine? I mean will the same aftermarket parts (headers, cams, CAI, etc.) going to fit the exact same on both engines? I want a premier engine, but i would prefer the auto w/tapshift as a transmission. Any help?

Thread moved to proper forum.

headpunter · 08-02-2008, 03:47 AM

Quote:

Originally Posted by garfin

They both utilize LS7 heads and larger ports/valves.

the engines use L92 heads which were originally truck heads. not the ls7 heads

o2camaross · 08-02-2008, 08:30 AM

Quote:

Originally Posted by headpunter

the engines use L92 heads which were originally truck heads. not the ls7 heads

They are very very close in design and are prolly the best flowing heads gm has ever made.

*CamaroSpike23* · 08-02-2008, 07:04 PM

Quote:

Originally Posted by The_Blur

The last L99 was a slightly modified LT1. I don't know anything about this one.

technically, it was a reduced modification LT1...lol due to the smaller bore of the l99 it didnt need the extra boring out that the 5.7 needed...

however, this L99 is the same block as the LS3, its pretty much the same motor overall, with the exception of the cam being slightly different and the AFM added to it.

Quote:

Originally Posted by headpunter

the engines use L92 heads which were originally truck heads. not the ls7 heads

Quote:

Originally Posted by o2camaross

They are very very close in design and are prolly the best flowing heads gm has ever made.

L92 heads are FTMFW

08-01-2008, 06:10 PM	#1
str8himalaya A lot to learn! Drives: 2012 Camaro SS Transformers Edition Join Date: May 2008 Location: Ohio Posts: 131	LS3/L99 Question... Are they pretty much the same engine? I mean will the same aftermarket parts (headers, cams, CAI, etc.) going to fit the exact same on both engines? I want a premier engine, but i would prefer the auto w/tapshift as a transmission. Any help? __________________ 2012 Camaro SS Transformers Edition. Excited to build up my first Camaro! Current Mods: -Spectre CAI -Straight piped -Power Wedge

08-01-2008, 07:05 PM	#2
The_Blur Moderator Drives: 2018 Harley-Davidson Street Bob Join Date: Nov 2007 Location: San Diego Posts: 14,769	The last L99 was a slightly modified LT1. I don't know anything about this one. __________________ RDP Motorsport//GEN5DIY//Cultrag Performance//JPSS//Rodgets Chevrolet// Operation Demon//Buy at Invoice//RACECARWEAR RESPECT ALL CARS. LOVE YOUR OWN. warn 145:159 ban

08-01-2008, 07:14 PM	#3
GTAHVIT Blessed Drives: 2013 Sonic RS MT Join Date: Dec 2007 Location: Saint Augustine FL Posts: 28,444 View My Garage	I thought it had been stated they are the same engines save the L99 was modified for AFM? __________________ Click image to see build thread. PQ - "the love of cars. It's a boys first step toward manhood and a mans last hold on boyhood." Fbodfather - "We do not want to use the Z28 moniker on a car that does not deserve this hallowed name." The_Blur - "Let's not confuse competitors with equals."

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08-01-2008, 07:18 PM	#4
jmliptak Drives: D Join Date: May 2008 Location: D Posts: 373	There is an entire thread in the Engine section of this board on the L99 and AFM and the implications thereof, as well as any number of other random ramblings (especially the ones from me!): http://www.camaro5.com/forums/showthread.php?t=5181 It is essentially the LS3 with AFM and associated goodies, it is a 6.2, but there MAY be some issues with modding it, then again maybe not...There is a lot in the thread above>