Technically an LS is an ls1, ls2, ls3, etc... all LS engines are aluminum blocks. They have many iron block engines but their ID does not start with LS. Nowadays everyone just calls a gen 3/4 chevy v8 an LS. I mean they aren’t wrong in a sense but there’s a significant price difference between an ls2 and an iron block 6.0 truck engine.
So a LS is ONLY if it is the aluminum block engine? What did they put in trucks and SUV's?
Mine being a 4.8 iron block, it's designation is LR4, and it is also used for the 5.3 designation. The only way to tell the difference from a LR4 4.8 and 5.3 is removing the head and look at the bore. The id on the block will not show if it is a 4.8 or 5.3. In general terms we call it a LS engine, but technically incorrect to call it a LS. A Gen III 6.0 iron is a LQ4 made in early 2000's, then the LQ9 is the updated version of the LQ4 which was put in trucks. Confused yet?
I have access to both motors and transmissions. Which is best? Which is easiest? I have a 99 TJ with the 2.5l? I know there is a ton of info out there on kits and how to convert....I am trying to decide which path to take. Any advice is appreciated. I will be doing this swap sometime on 2021.
I just got done with my swap, if you want to do it yourself, better have 12-15K of disposable money. There is alot of custom fab work that needs to be done, and if you cannot do it yourself, gonna have to pay someone to do it. @Wildman is most knowledgeable on the Mopar stuff, and @toximus or I can guide you through the LS. Take a long look at our build threads also.