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-   -   2005 Legacy GT V8 Build (LS2/LQ4) (

btlegacy 08-14-2012 09:09 AM

2005 Legacy GT 6.0L V8 Build (LS2/LQ4)
I have been working on a few V8 build recently and have decided not to rebuild my legacy back to the 2.5L Turbo but to swap it out for a 6.0L V8.

We are building everything ourselves and are working on a V8 Miata at the same time.

The engine is going to be an Iron LS2 or LQ4 which will have headwork and cam done to produce around 450 rwhp. The transmission will be a T56 6-Speed.

The car will be RWD due to space constraints and will fit what I need it to do. I am going to run the GM ECU and interface it to the Legacy cluster.

The front accessories are from a C6 LS3 Corvette to save space.

If you want to see quicker progress buy my stuff haha :))

Here are the specs on what I have so far:

2003 LQ4 6.0L Short block with dished pistons
2006 GTO Front Sump Oil Pan and Pickup
2010 Corvette Water Pump and Harmonic Balancer

The head will most likely be 243/799 LS2 heads but I may go to LS3 head depending on what kind of deals i find. Once the heads are bought I can decide what direction to go in as far as a cam

The heads will be milled in any case and the goal is to run around 11:1 compression and stay on 93 octane

The T56 will most likely be the CTS-V unit since it has a shifter setup similar to the Legacy and is improved over the F-Body units
This will send power through an LS7 Corvette clutch

paintpollz 08-14-2012 09:14 AM

subbed for ridiculousness

btlegacy 08-14-2012 09:14 AM

Here is a picture of the first quick mockup we did once the mockup engine arrived. We are going to modify and reinforce the subframe to move the engine back another 3 inches and we are also going to use outback pieces in order to drop the subframe an inch lower

DocHolladay23 08-14-2012 09:17 AM


Originally Posted by paintpollz (Post 4025507)
subbed for ridiculousness


BarManBean 08-14-2012 09:26 AM


Originally Posted by paintpollz (Post 4025507)
subbed for ridiculousness


Originally Posted by DocHolladay23 (Post 4025514)

Oh haaaaiiiiiii!

paintpollz 08-14-2012 09:39 AM

damn work computer cant see pics

btlegacy 08-14-2012 09:44 AM

Here are few more pics we took when we were doing the initial quick mockup. This is without squaring off and center the engine and before the subframe modification and Outback subframe drop. Once all those modification are completed and the hood is swapped for a scoopless one we hope to be able to make everything clear under there

btlegacy 08-14-2012 09:45 AM

That motor mount bracket in the middle of the firewall is now drilled out and patched as it was in the way

cryo 08-14-2012 10:00 AM

Subscribed, love motor swaps


derffred 08-14-2012 10:05 AM


cypher0117 08-14-2012 10:18 AM

I have dreamed of doing something very similar when my motor goes boom

btlegacy 08-14-2012 10:30 AM

Thanks for the encouragement guys. Now just buy all my 2.5L parts so I have more funds to move faster on this heheh

Ostrowrx 08-14-2012 10:36 AM

Curious, What do you expect a build like this to cost, and how long do you need to get it done?

Nrw 08-14-2012 10:37 AM


btlegacy 08-14-2012 10:41 AM

The build is being done when we have free time from other work so I work on it around 5-10 hours a week and I expect a total of 200 hours to get it done.

The motor, harness, and ecu are going to end up being Free after I part out and scrap the vehicle they came in.

The CTS-V T56 is around $1300

We are doing all of the fabrication so that is free to us

The heads, cams, etc will be around $800-900

Accessories around $200-300

There are many other item so the total rough budget was around $4000-4500 when all is said and done

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