67 firebird

[iceman40]

Currently have a 67 firebird with an mids 70's 400 w/400 turbo tranny.
Looking in putting a 2006 ls2 from s gto. Like to know whars all needed to do a swap? I know engine mounts, tranny mounts,headers from gto, but what about the engine harness and ecm. What has to be done with that.



Thanx for and input on this

[rickpaw]

I'd go with Holley for the entire LS swap kit. Oil pan/engine & trans mounts/exhaust. You can get a new stand alone harness from speartech/PSI conversion, etc and have the ECU reflashed; or you can redo the factory harness. I went with a new stand alone harness from PSI when I did my swap.

You maybe able to reuse the GTO front accessories also, or source the brackets from Holley, or others.

[iceman40]

So should i just get a 6.0 from a truck instead from a gto

[SSLOW6.0]

So should i just get a 6.0 from a truck instead from a gto

Depends on what you'd like to do with the car?

Aluminum LS motors are roughly 100lbs lighter than the Iron block. An LS2 short block will have better heads, and higher compression ratio than an iron block truck motor, but LS2's are 3-4k and LQ4 truck motors are 500-1000 around me.

I went economical route and went with the truck motor route with an LS3 cam and valvesprings. I plan on adding a set of CNC ported LS3 heads and an L96 truck intake down the road.

If you can fit the truck accessories under your hood (I can in my 86 Monte Carlo SS) it is a very cost effective way to do the swap.

I highly recommend the holley swap parts. https://www.holley.com/products/ls_p...ap_components/

I used their mounts and 302-2 oil pan. I bought a set of cheap ebay headers though (couldn't stomach $1000 for headers) for a controler, I used Microsquirt and made my own harness, but that is because the engine harness was cut already and it didn't come with an ECU. The GM ECU is the best way to control an LS motor, but the Microsquirt is the cheapest.

[AU Doc]

......
Aluminum LS motors are roughly 100lbs lighter than the Iron block. An LS2 short block will have better heads, and higher compression ratio than an iron block truck motor, but LS2's are 3-4k and LQ4 truck motors are 500-1000 around me.
.....

if you can find an LQ4 for that price, I'd say jump on it! Everything I found in my area was quite a bit more than that ($1500 and up for anything with reasonable miles), and once I figured in the cost of the intake, TB, etc. to get it to fit under the hood, I was close enough to the cost of an LS that it was a tossup.

[SSLOW6.0]

if you can find an LQ4 for that price, I'd say jump on it! Everything I found in my area was quite a bit more than that ($1500 and up for anything with reasonable miles), and once I figured in the cost of the intake, TB, etc. to get it to fit under the hood, I was close enough to the cost of an LS that it was a tossup.

Michigan is apparently the place to get an LS motor then. I did a 6.0 LQ4 on my car. got the 120k mile specimen out of a running and drive rear hit 2004 Yukon Denali for $700 complete, good compression and leakdown, but the harness was cut, no ECU.

[rickpaw]

So should i just get a 6.0 from a truck instead from a gto

Depending on your budget. If you're going for boost, then the iron block is better, if not then the LS2 due the weight saving, but the LS2 costs more (at least in Houston). You'll have to replace the oil pan regardless which motor you run. And replace the truck intake if you're using the truck motor, due to the height.

[SSLOW6.0]

Depending on your budget. If you're going for boost, then the iron block is better, if not then the LS2 due the weight saving, but the LS2 costs more (at least in Houston). You'll have to replace the oil pan regardless which motor you run. And replace the truck intake if you're using the truck motor, due to the height.

Do you know if the Truck manifold will fit with a cowl hood? This is just me asking out of curiosity.

[rickpaw]

Do you know if the Truck manifold will fit with a cowl hood? This is just me asking out of curiosity.

Don't know for sure. Prob. a 4" cowl hood? IIRC it stick up about 2"-3" past the fenders, when using the DSE LS engine mounts.