PatsLs1vette

pm me.

FRSTR90

Don't worry about hijacking this thread... I am sure everyone interested in doing a similar swap would like to know this kind of stuff.

By the way, palamesa, I'll make sure that I give you a buzz whenever I get a chance to go to san diego!

hosspowerinc

Im doing the Ls6 swap soon as well. Its going to cost me around $3k for the whole setup but I got a few good deals on parts. The way I see it, to build a stout 425 hp 1st gen 350, its going to cost you around the same $ as an Lsx swap. But with the Lsx you get an aluminum block and heads, great fuel economy, reliabilty, and tons of power with a simple cam swap. If you try to get all this with a first gen block you would pay $15k or more. My .02

clutch200228

glad i found this thread. even witha carb the lsx engines will get great mileage with an overdrive. i just need some motor mount info. i have 6 lsx engines. will be using the lq9 lsx out of an 04 escalade. the 5.3 is a strong engine. my 5.3 2000 sierra runs like hell. i will go carb on mine.

MikesBlueGoose

I'm currently swapping from a 327 TPI to an LM7 (5.3 from a truck). From an initial cost standpoint, the LM7 is a cheap motor to get into, but make sure you get everything you'll need with it, or be prepared to buy what's left. The yard I got mine form said it was a "complete changeover kit". Yeah. Electronic throttle, but none of the parts to make that work. No MAF. No O2's. Paid 1500 for the motor and transmission, so I still think I got a deal, but after adding 300 for the Elec. throttle parts, 250 for an F-body intake (w/ Injectors & rails) & oil pan, 40+ for the brackets to lower the accessories enough to put the hood back on... it starts looking like I should have paid more for the LS1 to start with.

That being said, it'll be nice to never worry about those carb-related issues (pumping to start, loading up, etc). Will be a LOT easier to install cruise (with the elec throttle). Plus, with the 3.08 rear i have, should be some nice cruising mileage.

At to mileage on a C5, I know on Dad's 04 6 speed, he gets about 32 hwy. It's seen a lot more highway mileage than city driving, so don't know accurate city numbers, but I'd guess 25+. Has K&N intake, longtubes, and a Borla catback system.

Budman68

The whole point of the swap is to gain the benefits of FI. Why a carb? You still are going to have to use a puter to tune it. Is it the fuel system, that you don't want to mod? Sorry I'm having a hard time understanding why you would go that route. It's just four wires.

desi

Why would the LSx with a carb get better mileage than any other carb'ed engine?

As far as the engine mounts go, http://www.sriiimotorsports.com/196382conversions.html sell adapter plates for $100

70 LS1

Because the engine is designed to be more efficient.

Eddie 70

I read somewhere that in 01 15% of the blocks were LS6 blocks.
In 02, 25% of the blocks were LS6 style. I looked mine up and I am in the 75% of LS1 blocks. The LS6 block does not make more power though. But I would have been really tickled to see mine was an LS6 block to go along with the LS6 intake.

Casting number for an LS6 block is 12561168. Go check your casting number and see what you got.

Eddie 70

I have another quick question for you guys that have done the LS swap and are now running it. Did you install the OBDII connector to tune with? I was out looking at mine last night and I do not have the OBDII connector with mine. I do have one set of wires with a round grommet that went through the firewall and it has two plugs on it, one blue and one white. I was hoping this might be for the OBDII plug and all I would need to do is go get one at the junkyard so I can tune.

palamesa

My 02' LS1 ended up being an LS1 block. I was a little disapointed because I was thinking of rebuilding it as a 405 HP Z06 LS6. I'm still pretty happy with what I have though. Much better than the whopping 185 HP that my 76' 350 was putting out.
I think that there was a few different HP options for the 2001-2002 LS1's. I'm still doing some research but I think the base model was 310 HP. Mine came out of a Camaro with the Z28/SS package so I think it's a 335 HP.
Just bought my motor mounts from Jegs.....I was surprised to see that shipping was FREE. After check-out, I noticed the $12 Handling Charge.....Grrr

palamesa

I'll be putting one in mine as a requirement for smog testing here in Cali. Speartech.com are the experts in these wiring conversions and can help you with the OBDII if you get stuck..gp

Eddie 70

Mine is like yours, not an LS6. But mine did come out of an 02 SS also. So, like you I have no idea what the HP numbers are for sure. But, when this is all said and done, I will have essentially an LS6 plus a little. Are you shooting for headers? I bought some Z06 manifolds for the time being.

palamesa

Eddie..I'm still trying to figure out what to do with the exhaust. I have to be able to fit the stock O2 sensors from the original set up so I'll be able to pass smog.
I assume you went with the Z06 manifolds to clear the steering box??
Where did you buy the manifolds from?
Some guys on LS1TECH.COM are modifying headers to work but nothing off the shelf available YET. Seems like all the aftermarket folks are spending all of their time working on a chrome bumper conversion kit.

70 LS1

The OBD II plug has 4 wires hooked up that you care about. Pin 2 goes to the PCM, 4 and 5 are ground and 16 is power. I'll look at the PCM pin number when I get home. I got my connector and pins from the local Chevy dealer.

Budman68

Eddie, I think the LS6 make more power at the top end. Mine is a LS6 and it dyno'ed around 375 flywheel. I've heard of a few SS dyno'ing at 325 rwhp, but that is very rare. Most of the standard LS1 dyno around 340 - 350 flywheel. It might be because of the windage holes around the crank. Mine also revs up and hit the rev-limiter fast. Almost to fast to predict.

I would mount your obd plug inside the car, I made the mistake of installing mine on the firewall. Looks kind of funny driving down the road with the scanner wire draped across the windsheild.

Budman68

Have you picked a cam? Be careful talking to those F-body guys, they will have you installing something with 625 lift.

PatsLs1vette

yes i can run efilive on it and tune it.

palamesa

Hey Buddy and Pat.....I know nothing about collecting data like you are talking about. Is this a software and cable you can buy for your PC (laptop) or is it a stand alone device? Do you buy them from GM or????TIA...gp

palamesa

It's all right here guys. Started out with Pat's EFILIVE.
http://www.ls1tech.com/forums/showthread.php?t=368718