Appearance difference between LS1 and LS2 in a F-Body??

**SteelmanLS1** · 10-01-2007, 11:20 AM

There is a kid in my school that just got a 99 WS6 with 69k miles and he keeps telling everyone that they previous owner blew up the ls1 and dropped in a ls2 instead... When he pops his hood what will I need to look to know if it's a LS2? I mean whats the biggest difference? I know they are the same block but what else? I have a 00 WS6 6 speed with long tubes full exhaust a lid and a tune and his is automatic with stock exhaust tps (not even the WS6 exhaust, but its the regular T/A exhaust) but he says it has a "ls2" which I think is comletely stupid becasue he is not mechanically inclined lol..

**Firebirdjones** · 10-01-2007, 11:52 AM

They moved some sensors around. You need the harness extensions for a couple of the sensors for this to work in an LS1 car. Off the top of my head the cam sensor was moved from the back of the motor (LS1) to the front of the motor (LS2). I believe this makes the front timing cover different.

Can't remember what else was moved,,,possibly knock sensors? I am sure someone will chime in with other visual clues other than the obvious casting number differences,,,but those are not that easy to read when the engine is in the car.

**9T8W66** · 10-01-2007, 01:11 PM

If I remember correctly off the top of my head the LS2 uses a TB held on by 4 bolts vs the LS1's 3 bolts. Obviously if it had an LS6 intake instead of ans LS2 it would have 3 bolts.
And LS2's do not require an EGR valve which the `99 LS1 should still have.

**Mr. Luos** · 10-01-2007, 02:48 PM

Originally Posted by SteelmanLS1

I know they are the same block but what else?

The blocks are the biggest difference. Knock sensor location and cam sensor location are different, and the bore is larger on the LS2.

**SeVeReDiStOrTiOn** · 10-01-2007, 03:05 PM

Aren't the heads a 243 casting also...same as the LS6? If he has 243 heads it still might not be a LS2 but you'll know it has some work done to it.

**Zboner** · 10-01-2007, 03:06 PM

Originally Posted by SteelmanLS1

There is a kid in my school that just got a 99 WS6 with 69k miles and he keeps telling everyone that they previous owner blew up the ls1 and dropped in a ls2 instead... When he pops his hood what will I need to look to know if it's a LS2? I mean whats the biggest difference? I know they are the same block but what else? I have a 00 WS6 6 speed with long tubes full exhaust a lid and a tune and his is automatic with stock exhaust tps (not even the WS6 exhaust, but its the regular T/A exhaust) but he says it has a "ls2" which I think is comletely stupid becasue he is not mechanically inclined lol..

race him, and fine out, lol

**SteelmanLS1** · 10-01-2007, 03:49 PM

AS far as I knew the previous owner blew the old ls1 and they just replaced it with a used ls2 to sell the car..... Isn't the alternator in a different spot or something? If its a the stock LS1 and this kid is just talking there is no worry about him beating me lol... Surely my modded tunned 6 speed would walk his stock A4 pretty bad from a low roll.. But if it's a stock LS2.. Now that would be a hell of a race... This car has stock exhaust tips and everything.. I don't see someone putting a LS2 and leaving stock exhaust?

Mod List:

LS7/LS2 Clutch kit
MSD 8.8 wires
NGK TR55 plugs
Pacesetter Long tubes
Pacesetter 3" y-pipe
SLP Loudmouth 1 catback exhaust
SLP Lid
EGR/Air Pump both deleted
and a street tune by Quality Custom Racing..