Has anyone replaced their Ls1 for a Ls2 yet. I had a broke valve spring and now i have to replace the whole engine. I was wanting to install a Ls2 with a stroker kit. I was wondering what all has to be swapped out. I'm looking at the SLP 402 . I know i will have to have the computer retuned but i'm wondering about the oil pan , knock sensors, the stock 78 MAF things like that. Any input would be helpful.

you best bet would be to find a complete engine somewhere, that way you'll have everything you need if you do need it. I can't image there is a big list of things needed for the swap.

you best bet would be to find a complete engine somewhere, that way you'll have everything you need if you do need it. I can't image there is a big list of things needed for the swap.

Nocturn is correct. If you are interested in making the swap, there is a company in Texas that would be more than happy to do it for you. If I remember correctly, it is a bit pricey, but you can be rest assured that it is done correctly. I think that the price is about $20K. What you get is a 455 cid engine that makes 605 Hp and 610 Tq. If I had that kind of money lying around, I might be tempted to do it myself. If interested, PM me and I will provide you the URL to their website.

-K

Yeah i had already checked them out but they are a little pricey for me. I was thinking about the sl 402, with a set of patriot LS6 style heads, and a bbk intake with the 90mm throttle body. I guess i'll have to change out the MAF for a bigger one off another GM car or truck. I think this package with the headers and cam i have should make over 500 and only cost between 6or 7,000. I hope, its gonna take me forever to get that much money. So until the Goat isn't going anywhere because of a blown motor. I used the wrong valve springs for my car . I need a .650 double spring and used a .625. Live and learn then blow stuff up.

i mean zl 402

Even if you do the swap yourself, it's going to be quite an extensive undertaking, since the LS2 uses a different wiring harness and the fly by wire system. It won't be a simple bolt-in. I would think your BEST bet would be to just build yourself an LS1 based LS stroker motor that uses all of the LS1's wiring and sensing devices. That way it'll bolt in and your biggest hurdle will just be having it tuned.

ya with heads and cam the LS1 is a lot closer to the LS2 in power without the hassles. the difference in displacement is like 346 to 364 i think

Even if you do the swap yourself, it's going to be quite an extensive undertaking, since the LS2 uses a different wiring harness and the fly by wire system. It won't be a simple bolt-in. I would think your BEST bet would be to just build yourself an LS1 based LS stroker motor that uses all of the LS1's wiring and sensing devices. That way it'll bolt in and your biggest hurdle will just be having it tuned.

Agreed

I was thinking i could just get an aftermarket throttlebody that uses the cable system . The ZL 402 is made to be able to retrofit into an LS1 and the only wiring harness proplems is that you have to relocate the knock sensors and the cam position sensor i think. I have been trying to do as much research as i can but i may just build the stroked LS1 that i can be sure it will work. I just really wanted to have a 402 instead of a 383.

I was wondering if anyone knew the difference between the 402 LS1 and the 402 LS2 . They both have a 6.0 liter block. If the only difference is the wiring harness or such this would allow me to have my 402 and not have to deal with the proplems i would have with the LS2 402 kit.

The knock sensors on an LS2 mount in an entirely different location than the ones on the LS1 do. LS1 blocks do not have the provision for the knock sensor in the "LS2 location".

show, is your car under warranty? If so, get it replaced and have them throw in an LS6. Pretty common thing for them to do. I have 2 friends who have done this. It costs you $100 out of pocket because that's what GM charges the dealership over the LS1 you currently have.

I used the wrong valve springs for my car . I need a .650 double spring and used a .625. Live and learn then blow stuff up.

He won't be covered if he broke into the heads/engine.

He won't be covered if he broke into the heads/engine.

Right you are! If he has a sympathetic mechanic/service writer he may get lucky, however, I doubt it.

Best of luck, in my opinion the LS2 swap is far too involved for the gains you would recognize.

Best of luck, in my opinion the LS2 swap is far too involved for the gains you would recognize.

I'll agree there. A nice built LS1 could do the trick. :)

My car is about a 1,000 miles over my warranty because that was my first thought. I decided just to go with a well built LS1 and hope i get the numbers i want. If not there is always nitrous!

where is a good place to but a 383 package or just a LS1 block then the stroker kit. Is the GTO LS1 block a 5.3 or is that a different block?

I really don't have anything else to add here, I'm just posting useless text.

Oh, yeah....the 5.3 is a different block. Same engine family, but the 5.3 has a smaller bore and it's cast iron too. The 5.3 and the 5.7 LS1 DO share the same crankshaft though. (same stroke)

Well i got another question, will i need bigger fuel injectors ? I want to get everything right this time i work on this motor .

Well i got another question, will i need bigger fuel injectors ? I want to get everything right this time i work on this motor .

Depends, what exactly are you getting done?

LS1 stroked to a 383, stage 3 patriot performance heads(2.08/1.60/64cc), comp cam custom grind 238/242 605/610 115 lsa, 1.7 roller rockers, stainless works 3" long tube headers, flowmaster x pipe no cats super 40s, and maybe a new intake. Don't know if the intake will make a big enough difference. If the stock will work i'll keep it.

I already have the cam and the long tube headers and the exhaust.

I would just to be safe, better to blow a few hundred on new injectors than a few thousand on a new block.

So what size do you think i would need ?