interesting article on the LS3

**310stanger** · 07-20-2008, 02:50 PM

If you like reading about engine tech, this is a great article on the LS3. http://www.corvetteactioncenter.com/...ls3_page1.html

**Kup98ss** · 07-20-2008, 03:24 PM

isn't that engine a direct fit into our cars? Wireing and all that crap.

**Mr. Luos** · 07-20-2008, 03:29 PM

Originally Posted by Kup98ss

isn't that engine a direct fit into our cars? Wireing and all that crap.

Very close, but not quite.
It is a Gen IV, and ours is a Gen III.

Slight wiring changes would need to be made. Block itself should be the same outside dimensions.
Obviously the internals are different.

**310stanger** · 07-20-2008, 03:55 PM

I think like Mr.Luos said there'd be wiring issues. My guess is that you need a new wiring harness, i think the locations of some sensors on the gen IV ls are different, I wanna say cam sensors and crank but i'm not positive. As far as engine mounts etc, i think they go right in.

**Mr. Luos** · 07-20-2008, 03:57 PM

99% sure they have harness extensions so you don't need to get a whole new harness.

**310stanger** · 07-20-2008, 03:59 PM

Originally Posted by Mr. Luos

99% sure they have harness extensions so you don't need to get a whole new harness.

makes sense. I'm the idiot that swaps the entire harness to find out that you could do that, the day after i complete the job.

**67CamaroRSSS** · 07-20-2008, 04:26 PM

Isn't the LS3 a "fly by wire" type throttle set up? If so add that to the list.

**310stanger** · 07-20-2008, 04:28 PM

Originally Posted by 67CamaroRSSS

Isn't the LS3 a "fly by wire" type throttle set up? If so add that to the list.

good point, you need to use the gen IV computer, which has algorithym for a throttle by wire tb.

**310stanger** · 07-20-2008, 04:28 PM

at any rate, i enjoy reading articles like that.

**Y2KPewterSS** · 07-20-2008, 05:41 PM

I would like to drop a new LS3 in the Camaro in another year or two. Good article for sure.

**GTP231** · 07-20-2008, 06:20 PM

Originally Posted by 310stanger

good point, you need to use the gen IV computer, which has algorithym for a throttle by wire tb.

Nope. Just use a LS1 F Body TB and you're fine

**9t8z28** · 07-20-2008, 06:39 PM

This is the best part!

As we rolled towards Bowling Green and the National Corvette Museum, I reflected upon the LS3. General Motors' Generation-Three and -Four Small-Block V8s are some of the World's great engines. Don't believe it? Just ask Mercedes-Benz. When it owned Chrysler, it copied–oops–it benchmarked GM's Gen 3 Small-Block architecture then reproduced key aspects of it in its current Hemi V8.

Chrysler borrowing from that block design for V8s in its own full-sized trucks and performance cars says much about GM's engine technology. Some might be disbelieving of the Gen 3/4 block being so inspiring to a competitor but, if you ever see the two short blocks disassembled, side-by-side on a bench; the influence will be obvious. Imitation is the best form of flattery.

**9t8z28** · 07-20-2008, 06:39 PM

How do they fracture the rods?

**67CamaroRSSS** · 07-20-2008, 07:17 PM

Originally Posted by GTP231

Nope. Just use a LS1 F Body TB and you're fine

Correct me if I'm wrong but:

IIRC, the cable operated TB (ala LS1) is smaller in diameter (read: less cfm of flow) than the LS2/3 TB (electronic type) thereby creating a choke point. I believe they mount differently also.

**GTP231** · 07-20-2008, 07:39 PM

Originally Posted by 67CamaroRSSS

Correct me if I'm wrong but:

IIRC, the cable operated TB (ala LS1) is smaller in diameter (read: less cfm of flow) than the LS2/3 TB (electronic type) thereby creating a choke point. I believe they mount differently also.

They mount the same. We bolt up LS2 Throttle bodies on Fast Intakes for Vettes regularly. LS2 Intakes are already a 90mm inlet so any 90mm TB will mount up

**67CamaroRSSS** · 07-20-2008, 07:56 PM

Originally Posted by GTP231

They mount the same. We bolt up LS2 Throttle bodies on Fast Intakes for Vettes regularly. LS2 Intakes are already a 90mm inlet so any 90mm TB will mount up

OK, I wasn't sure. I knew they were different diameter.