kbog54

Hey guys, i'm gonna get rid of the good old 305, and was thinking about swapping in an Ls1 or LT1. I'm basically thinking about swappin in the engine and auto. tranny.

Which of these engines would be the easiest to swap in (i'm doing all of the work myself)

Are there any serious problems that I would have to be thinking about?

I would be buyin the conversion kit from 3rd gen.org to smooth out the process.

thanks

trackbird

I suspect the LT1 will be an easier/less expensive swap.

kbog54

does anyone know a website that details this sort of a swap? I was leaning more towards the lt1 myself because they are more common.

also, will the tranny bolt up? or will i have to fab a new crossmember

Rice Killer87

if u use a T-56 6 speed,u will def. need a new crossmember,as for the A4,im not absolutely sure...but probably.

LiquidSkies

LT1 is what i would do also. the swap is way cheaper and parts are also. they are much more plentiful too. plus, you can always up to an LT4 which owns the LS1

aklim

I wouldn't do the LT1 swap. IMO, too much trouble and money for too little gain. If I was going to do an upgrade, it would be a LT4 or LS1 swap. As mentioned, the LT4 owns the LS1. I don't think there is that much more potential for the LT1 to justify the work and money. If I was not willing to do the work and dump the cash, I would beef up the L98. Professional opinions rate the LT1 at about 20-30 HP more for a heavily modified LT1 as opposed to an L98 with the same mods.

LiquidSkies

but the whole idea of having an LT1 in a car thats not supposed to have one is absolutly awesome. if i had an LT1 or could score one for cheap, i'd swap. but i'm with you Aklim, if you have a 350 in the car already, spend the thousands you'd spend on the LT1 swap, on your current engine. then you'll be owning the LTs no prob

97WS6SCharged

A 4L60E tranny from a 4th gen will work in a 3rd, the T56 will need a new cross member because it's longer than the 700R4 or the T5 that came in the 3rd gen.

Do the LT1 swap and while the LT1 is not in the car, have the stock heads ported and polished, and throw in a nice cam with some 1.6 rockers.

slashz28

lt4's "own" ls1's?? stock vs. stock, comparable, but no ownage there really

if you have a little extra $$ to spend, go ls1, if not, go lt1. just cam the ls1, and youre flying

theres TONS of info on "EDIT" thirdgen.org on both of these swaps. good luck whichever you choose

LiquidSkies

well for the "ownage" i was referring to the lt4 kit from summit, 425 HP. thats a lot more then the ls1's 330... both are nice engines though. i prefer my alternators on the top of the motor tough...

aklim

Might be cheaper to Supercharge the old L98 and that will give you more power than you could have got going with the LT1 or LS1.

LiquidSkies

yeah id take a charger over the lt or ls engines. good thought

aklim

I'd get about an 8:1 compression and a blower with healthy boost and some DOT slicks.

kbog54

Yeah, the engine that I have right now is the 305 with crossfire injection, so basically any 350 is gonna be a large increase in power.

From the posts, I get the idea that the lt1 swap would be the easiest, I think im gonna go with the A4 because i dont feel like swapping a manual into my currently automatic car.

Will i have to get a custom driveshaft? or will the tranny bolt right up?

Also, will my 10 bolt rear hold up?

I'm running 275 60 r15's out back right now, so they should be able to handle the extra horsepower.

Also, i've heard the subframe connectors are a must- who makes the best pair for the money?

thanks guys

aklim

See as how you have to change harnesses anyways, you could go with any motor. Like I said before, the LT1 will require some work whereas the L98 will fit in perfectly. The question you ahve to ask yourself is this: Is it worth the work for the "Ooooh and Ahhhh" factor?

Edit: Changed it from L09 to L98