ls3 swap whats involved
09-18-2010, 05:10 PM
#1
Staging Lane
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ls3 swap whats involved sorry for being such a newb when it comes to this. I am looking to get a new trans am and came across one that supposedly has a ls3 crate motor with low miles and I was wondering what all involved with the swap and how could I tell that it is even a ls3
09-18-2010, 09:29 PM
#4
The ls3 swap into an fbody isnt all that hard but requires a conversion box for the crank reluctor wheel along with a couple extension harnesses for sensors. If it infact has an ls3 motor in it the intake should have 4 bolts for the throttle body instead of 3 like the ls1 has. next look at the casting numbers on the heads 823 is a common one but there are other numbers they could be so look the up also on the front of the intake right behind the TB should be the map sensor on the ls1 this sensor is on the back of the intake.
09-19-2010, 10:11 PM
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thanks for the replies they have helped alot I still have a few questions you guys might be able to help me with I noticed they sell a few ls3 crate engines i noticed one has a hot cam is there any way to tell the difference between the different ls3's also is there a good list for casting numbers I have now had two people tell me 823 on the heads is there any other casting numbers it could be,thanks again
09-19-2010, 10:23 PM
#6
With the hot cam version you'd def be able to hear the cam in the engine idle. Ive also seen 4 digit head casting numbers like 5324 another one is 821 as far as any others youd probably need to do a little more research... The itake manifold should be the best giveaway as it will only mate to the l92 style heads which are standard on the ls3.
