I heard there was a conversion kit, or something to that manner:drinker

how much do they run 4?

and how would i go about to gettin more info on it:hmm:

Yes! GMPP sells the kits, and it contains everything needed to do the swap. I'll include links to both kits, as the 1996-up LT1s need a different kit.

1994-1995 Broughams (1992-1995 LT1) (http://store.summitracing.com/partdetail.asp?part=NAL%2DGMP3287%2D1) $2,289.95 http://store.summitracing.com/images/prtdtl_images/shim.gif

1996 Broughams (1996-1997 LT1) (http://store.summitracing.com/partdetail.asp?part=NAL%2DGMP3287%2D2) $2,329.95

The 1994-1995 kit is no longer sold by Summit, but I will poke around GMPP to see if it is still there.

What are the stats on an LT1 converted LT4? Horse and torque? Just wondering.

Here's a discussion we had about this last year. There's not a whole lot of information but it's a short read:

http://www.cadillacforums.com/forums/showthread.php?t=1927

I would love to do this.. I'd love to find someone who's already done it. There must be Somebody Somewhere! 425 horsepower! That's a big difference from 260! I wonder if you'd actually get 425 anyway - with the restrictions.. Maybe 400 when all is said and done. That would make a huge difference..

The kit costs under $3k but what would it cost to get all this stuff installed somewhere?

What about a regular ol Vortec L31 ... what can that be converted to?

Not doing it anytime soon. Intake, some minor exhaust work, and a chip. That's ALL I plan for the engine in my Fleetwood for a LONG time. Going to do a sound system, and just have a clean, simple cruiser.

Someone was mentioning a 396 in the other discussion (linked above)...

Hehehe, anyone thought of the 6.0L LS2 Vette motor coming out soon? ;)

396 was the original Chevy Big Block. Not a fine example and won't fit right in like the SB variations will. As I said in another thread, the engines now available at Chevy dealerships, as GM Crate motors will more than satisfy. I know you won't believe me, so All is OK! CYA!

Good Luck!

shadowluvr400....where can u get a chip for the FWB?...is it actually worth it?

i want to take the air pump out too...i know id need to reprogram the odb....the only thing i know about that is i have a notebook that id be able to use, an i can download the program...from there i wouldnt know wut else to do....

cable from notebook to car
wheel size
speed limiter
air pump delete
maybe sum gears?

Sorry, didn't spot that Question. On the Superchips, for the 94 Fleetwood, 22 horse, 30 torque. Pulls the governor too. Firms up shifts. It'd be worth it. Don't worry.

I heard there was a conversion kit, or something to that manner:drinker

how much do they run 4?

and how would i go about to gettin more info on it:hmm:

The LT4 conversion really isnt the best way to get power out of that car... I'd start a little simplier myself... Get some 1:6 roller rockers and a more aggressive cam, have the heads worked over and get a good port job on them, put a 3:73 gear in the car and get the PCM reprogrammed by someone reputable like Bryan Herter or LJ Mendoza. That superchips/hypertech stuff is junk, dont even consider it.

Go to impalassforum.com and spend some time talking to the guys there and you can get much better information about LT1 performance than here.

Oh yeah, removing the air pump wont really give you any performance gains at all and the LT1 uses a PCM.. start telling people you want to reprogram your ODB and you will get all sorts of funny looks :)

Now the only issue with changing to the lt4 is that the brougham is a much heavier car than the camaro. You will probably get a drastic hp change, but it wont' be as much as it will be on a camaro lt1. Gas mileage is also an issue. Camaro light, Fleetwood ton o bricks. If you really want to do something drastic, get a used LS1 and supercharge it. It won't be nearly as cheap, more like four times more expensive, but the car will move like no-ones business. Just a suggestion. :)

and the LT1 uses a PCM.. start telling people you want to reprogram your ODB and you will get all sorts of funny looks :)


:hide: that was my fault, i dunno why i wrote that


oh yea...i pretty much am dismissing the whole lt1- lt4 idea, i just want to reprogram the pcm, and get turbo mufflers for now

air pump delete wont make any significant differences?...well if thats true, then i wont bother with that, but i heard it makes sum goo gains...after the reprogram of course :hmm:

:hide: that was my fault, i dunno why i wrote that


oh yea...i pretty much am dismissing the whole lt1- lt4 idea, i just want to reprogram the pcm, and get turbo mufflers for now

air pump delete wont make any significant differences?...well if thats true, then i wont bother with that, but i heard it makes sum goo gains...after the reprogram of course :hmm:

Nope, removing the air pump will pretty much do squat... wouldnt even bother with it. Anyone who tells you that has basically zero experience with it and is just making things up. The only advantage removing the air pump gives you is a slightly less cluttered engine bay. You will be very happy with a PCM reprogram, will be the best bang for the buck you can get. Try Brian at http://www.pcmforless.com.

If you need a interface cable upload your own .lt1 files I have a brand new one I can sell you for $50 shipped.

I would reccomend a 3:73 gear also if you do nothing else, that will get the car off the line much better and be a very noticable improvement.

The speed bug has bitten me again dangit. Inspired by a Mustang Cobra and a BMW M3 going at it today. I wouldn;t go as short as a 3.73 gear though. I think a 3.08 or 3.23 would be better overall. Keep an ounce of gas mileage. Then supercharge the LT1. :) Anyone seen a blown Imp SS or something? :)

The speed bug has bitten me again dangit. Inspired by a Mustang Cobra and a BMW M3 going at it today. I wouldn;t go as short as a 3.73 gear though. I think a 3.08 or 3.23 would be better overall. Keep an ounce of gas mileage. Then supercharge the LT1. :) Anyone seen a blown Imp SS or something? :)

You want a 3:73 MINIMUM. My LT1 car with the 4L60E and a 3:73 turned 2000 RPM @ 70 MPH in 4th gear. Anything less will be a waste of money and wont show as much low end improvement. Have no fears about loss of mileage, the miniscule amount of highway mileage you lose will be made up for in spades by the cars off the line performance improvement.

So while I disagree with Shadow on the gear, I definately agree with him on the blower... if its in the budget, boost is lots of fun!

http://mywebpages.comcast.net/bobselby/cadsig.jpg

I dont want to drop to the 3.73, because it's shorter than I want. I'm not looking for all out performance. If I drop, it'd be to the 3.42 gear in the towing package. Can go hunt down a FWB with the tow package.

These cars tend to blow transmissions as far as I hear. It's probably all the weight. I'm guessing hard off-the-line take-offs aren't such a good idea. I'd love to have 400hp to gun it at 40mph and stuff like that...

I love how you guys want to make your cars faster and all, but to tell ya the truth. They aren't meant to fly, their meant to cruise and be old people cars. Bob has a different story and he and his car just kick ass. Just make your car a heavy hitter when your goin about 20 in a race and just have it boost. Shadow, get the 3.73 gears, Try a chip and a cold air intake. Its a heavy car and not much else than a brand new 383 is going to make it any faster. The 350 is strained as much as it is in that car. Its not going to be a street racer. Its too damn big. Plus, i bet you guys would like to have gas mileage.

Even the 383 is more horses than torque. Really kinda need to make a high torque motor, over high horsepower. Just because of the size of the car. And no, I'm not looking to make a street demon.

Rolling races are wack. The only fair drag race is from 0 until someone obviously loses. If you go for 400hp to take off from a roll, just go for less and beef up the tranny to take it from a stop.

I heard there was a conversion kit, or something to that manner:drinker

how much do they run 4?

and how would i go about to gettin more info on it:hmm:

Yes, there is a conversion kit that includes the heads, intake, etc. The kit runs approximately $2000-$2200, depending on where you shop. Try www.thunderracing.com or www.gmpartsdirect.com. I've ordered from www.gmpartsdirect.com in the past, and their prices are very reasonable.