Honestly, you're going to find little to no help from people on here because there have only been a handful of people who have done it- and I don't think any of them are on here. Maybe try motorswap.org (used to be L67swap.com), they may have some good info on there.

You shouldn't have to swap the brakes or suspension for the swap as a requirement though, I don't imagine an aluminum head, plastic intake LS4 is all that much heavier than an iron head, supercharged L67- and the transmissions are the same; so overall weight shouldn't really change much.

If you don't mind me asking- how cheap is really cheap for the LS4/4t65?

I'd second the reccomendation for an L67 swap personally, but thats just me

 

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Im pretty sure there really arent any huge issues. Id definetly watch out for the radiator and fans though, the bay might be smaller.

 

the only big difference i believe is the engine craddle the link i posted the guy had an 01 gp and he used the experimental motor that was in the impala ss. if you read threw it if you have the complete motor and trans including the manifolds you have 90% of the parts to do it. and who care about stopping you said you want a rocket!!!

 

Do the LS and SS have different rotors? I thought all the 00+ impalas and montes had the 12" front brakes; am I wrong on this? I would think if nothing else, that a regular aftermarket pad/rotor combination would be totally fine.

I'm assuming you have another car for your daily driver? I definitely wouldn't do this to your only car- I've seen too many people have problems swapping L67's back when that was new; and end up ruining their daily driver with a buggy swap car (one was even an ASE mechanic)- and thats nearly a bolt in swap.

I'm sure that was an oddball setup; are you sure the LS4 cradle is all that different? I would figure GM would try all they could to use the same cradle as all the other wbodys, and just run different mounts- but I could be wrong.


To the OP- have you looked into what you're going to do for wiring? I would assume you could just use all the engine bay wiring out of the LS4 car, but have you looked into how that is going to interface with the body wiring?

 

the engine cradle in the 06-07ss is an aluminum one. and your right about the brakes the ls4 monte and impalas run 12 inch rotors. the gp gxp runs 12.7s. that and i believe it has the fe4 suspension so the ride should be a little stiffer.
heres a link with a little info on the cradle.
http://www.fast-autos.net/vehicles/C...onte_Carlo_SS/

 

The cradles have been aluminum since 00 on the montes though haven't they? I know my 00 impala had an aluminum cradle.

 

i believe your right. they shouldnt have made a big deal about it in that article then. its misleading. just looked for a pic heres one off a 2000
http://carphotos.cardomain.com/ride_...0155_large.jpg
looks aluminum to me.

 

IDK about 00-05 Monte engine cradle, but I know in the 00 Bonneville 3800 which looks the same from under the car, the engine cradle is steel....My 06 Monte is for sure aluminum!

And Jeremy, Welcome to the forum!

 

thought about the same approach. Pretty sure they used the same transmissions in the 06' and 07' series. Im sure a Jasper would be a better approach though. Along with the 5.3 I would get a twin turbo.