MVRACING

How can you tell if its an LS2 or LS3..
Looking to buy a swap (LS3)
The one i may buy is missing the Fuel Rail covers and intake.
What should i look for to make sure its a LS3? Is there a serial # to look for?

acrc6

Not sure if this is helpful but if you can get the vin# maybe you can use this to decode it. Good luck.

http://www.researchmaniacs.com/VIN/VIN-Decoder.html

truckplay

if you can find the vin # U is an LS2 W is an LS3

if the Mass is an assembly it's and Ls2 a card type an LS3

if the intake is off you can also tell Cathedral ports are LS2 Square ports are Ls3

HOXXOH

You have that last one bakasswards. Cathedral ports are on the LS2.

Also, if the engine is out, there's a "LS3" embossed on the rear of the block.

haljensen

Intake ports.

truckplay

I stand corrected. I am used to seing the ports on my TF heads. I just checked my factory heads, it has been a long time since they have been on the engine.

Boomer111

Well makes me feel better to see somebody else with CRS syndrome.

timd38

LS2 is cast on the right side of the block at the front.

silverbullit99

I was wondering the same thing and found this link.

http://www.onallcylinders.com/2017/1...y-an-ls-engine

z06clif

Medical research has come a long way and the cure for this has been found. A young lady in her 20 s or if thats no good then Post - it notes all over the f..kin place . It must be noted that Post-its are much cheaper

Clif

Dano523

Just a FYI, but the Ls2 and LS3 blocks/engines are used in other cars than the vet, and do not make as much power as the vet LS2 and LS3 motors.

buckmeister2

It's been 4 1/2 years...he probably knows by now...

But, the info helps the rest of us.

simplegto

the LS2 has a casting number on the head 243.

Cherokee Nation

I buy the yellow ones by the pack...And on my desktop with windows 7 i can place them on my window saver....Getting a bad case of the CRS...