Fullblast

iTrader: (17)

I threw a rod out the side of my ls1 block this evening unfortunately. The motor was rebuilt 10,000 miles ago...so I'm not too happy. I doubt the people who built it will.warranty it. They said they wouldnt cover a snapped rod.

So I found a good deal on an ls2 short block and want to swap it in place of the ls1.
Are there any parts differences I need to know about? Reluctor wheel? Coil packs ? etc

Will it bolt to my T56? Will i need Ls2 oil pan? Oil pump?

soloman369

iTrader: (13)

Make sure it's a 24x reluctor wheel everything will swap over.

Fullblast

iTrader: (17)

I'm having bad Chad build my engine this time. That's what I get for having Sxt Performance build my motor. 10,000 miles and shes shot!

soloman369

iTrader: (13)

Sadly I know Ppl that have too much confidence in him and his motor let go at 100 miles

Fullblast

iTrader: (17)

Holy ****! Was that a white Gto or G8 that went out at 100?

Is there another place around here? What about Chucks performance?

Fullblast

iTrader: (17)

Well this is a Ls2 short block with under 30k for $1200, so it just needs to get the heads put on etc. I'm going with a Tick 237/242 cam this time as well. I have a 228/232 cam now...


Is there a noticeable difference between the Ls2 and Ls1 both stock? How many hp/tq difference could you expect by upgrading to the ls2?

96 Comp T/A

iTrader: (8)

So you are going to need a couple of other things to complete the swap, in addition to verifying the 24x reluctor.
You will need the LS2 Front cover, cam sensor, 1x cam gear cam sensor harness + aftermarket extension. Gen 3 cam sensor is on back of block by oil pressure sender, LS2 is on front cover. If you run knock sensors I believe you have to drill and tap the external block mounting points to accept the larger LS1 style knock sensors.
You will also need an extension harness for the knock sensors, on the LS1 they are in the valley, LS2 are down by the pan rail. If you do a quick search the swap has been covered ad-nauseum.

flintwrench69

iTrader: (11)

All of that & the ls1 valley cover wont fit on a gen4 block like the ls2. Will need ls2/3 valley cover or custom cover.

Fullblast

iTrader: (17)

I'm thinking about buying a brand new Ls2 and a callies stroker crank kit and making it a 402.

I've read that stroker motors are more reliable.....how true is this?

I dont want to have to replace this motor for a long time.

96 Comp T/A

iTrader: (8)

That's a real slippery slope. Typically a 402 or the like will have forged pistons and Rods, that are of higher quality and stronger than stock components. So, In that respect I guess you consider that more reliable, but only if you were going to drive it real hard, all the time. For normal use (no forced induction or nitrous), a stock GENIV rotating assembly is plenty reliable. One other thing to consider is that with a stroker motor, you will likely make more HP and Torque, and everything downstream will be absorbing that additional power, so clutch and rear end are two things to think about.

SCott5

iTrader: (40)

http://www.coloradospeed.com/engines...t-p-27542.html

You need this kit to make everything easy and buy it all at once. I too am going through the same swap on my C5Z. The big part of going to a LS2 is the 4in bore and the type of head you can use opens up. So depending on what heads you use (unless you go 402).

And you will need to drill in the side of the block and tap it for the knock sensors like someone said earlier.

HCI2000SS

iTrader: (2)

I switched my HCI over from a LS1 to my LQ9, and being the the LQ9 is essentially a iron LS2 there is no difference in terms of power and torque delivery. I noticed a broader and stronger torque curve, but power up top was similar

Fullblast

iTrader: (17)

I imagine the weight savings of the ls2 would help a small bit as well.

I have ported 243 heads and a fast 102 setup...is that sufficient for an ls2 stroker?

I found an ls3 short block.....can I bolt my ls1 topend on the ls3 block without any performance issues?

kingtal0n

iTrader: (1)

heres what I see

Guys that build engines with forged parts... $5000 in parts, throwing rods and spinning bearings after 100/10000 miles. A common excuse around here is "most people on this forum wont even put 10k miles on their engine" and they wave a hand dismissing this statistic.


On the other hand, I see folks with an $600 OEM shortblock 4.8 and 5.3L engines making 600-700bhp for 50,000+ miles reliably.

Seems like you could get five times the mileage out of a stock shortblock for 1/10 the price. It also swaps in right away (no waiting on stupid machine work that gets done wrong anyways) Just calling it like I see it.

Fullblast

iTrader: (17)

How the heck do you get 6-7Iut 00 hp out of a 4.8 or 5.3 shortblock without boost or nos?

10,000 miles aint enough for me. I have heads, cam and intake....does this equate to spinning rod bearings a lot faster due to the extra horsepower or could it be over tevving or dropping down gears and hammering on it?

The original ls1 had over 100k miles with no spun bearings etc.

I think I'm just going to put the ls2 short block in with my top end and a bigger cam and the ls2 conversion kit. Thats my cheapest option. I just hope to get more than 10k out of it. I cant see myself going down in cubes to a 5.3.

kingtal0n

iTrader: (1)

You need boost. The atmosphere cannot properly take advantage of the displacement of any of the common performance engines. Natural aspiration is a handi-cap, you are 100-200 horsepower shy of maxing the internals capability in most applications.

The bearings of built engines are spinning because it is very difficult to build an engine properly. Few people know how to do it right. Cleanliness is also an issue for many "shops" which employ non-educated staff. Furthermore, often someone will install a tri-coat bearing with an enormous 0.0025"+ clearance and use a thick oil thinking this is acceptable for a street engine, which it really is not. The performance engines of today use small OEM clearances, as small as 0.0008" On some of the rod bearings of 4-cylinder engines for example. The thin oil and tight clearance helps achieve maximum economy, and reliability.

All that loose forged piston stuff, excess piston/wall clearance, slapping around in the engine, the loose bearings/rotating parts helps reduce drag for drag racing applications, makes peak power better and allows a higher RPM rev-limit, at the cost of reliability, economy, and seems to diminish the number of miles possible before it falls apart.

Fullblast

iTrader: (17)

I've located an ls2 shortblock from a gto for $1200 with under 30k miles on it. It includes the timing chain, timing cover and valley cover. So that's most of the conversion parts already.

What exactly is the 24x reluctor wheel? Since this block has a crank and timing set included is that something i need to worry about?

Can you run the ls2 without a knock sensor?

Do the ls2 gtos have the Vvt system or active fuel management?

96 Comp T/A

iTrader: (8)

1. Reluctor wheel is inside the engine on the crankshaft. There were 2 versions of the LS2, one had the 58x wheel one had the 24x. If it is a semi complete engine, the easy way to tell is by the color of the crank sensor. If it's black it's a 24x, if it's grey it's a 58x. You most definitely need to worry about it. The car won't run if you get it wrong.
2. You can tune out knock sensors, but not recommended. You already have the knock sensors from the LS1, correct? Just drill and tap the block to the correct size and use those. It's a 15 minute job if the engine is out of the car.
3. The LS2's had neither of those things.

Fullblast

iTrader: (17)

So will the 58x reluctor not work with the ls1 wiring harness and ecm?

96 Comp T/A

iTrader: (8)

No. Not with out an expensive conversion box.