Has anyone built or worked with this block? I would like to build one similar to the one Reggie Jackson had built for his 69 camaro. Are the heads available yet?

 

We've already built a few short-blocks using GM's LSX block, and we will have one on the engine dyno in the next three to four weeks with our ported LS7 heads. GM is still working on their 6-bolt cylinder heads, but you can use any current LS-based cylinder heads on it.

Feel free to e-mail me at trevor@texas-speed.com with any questions or concerns.

Thanks!

Trevor
Texas Speed & Performance

 

Heads are not a big deal on almost any LSx based engine. LQ9's are quite affordable too. Trick flows, AFR's and PRC, and Dart are some of the better ones.

 

I believe they come with a 3.9x bore and will accept most Gen III/IV parts and can be bored to 4.25"

Obviously, you'd want to bore this thing out and put some C5-R or LS7-style heads on it

Mike

 

You'll want to limit your bore size if you are going to be spraying a lot of nitrous or running a lot of boost. It will be hard to get a gasket to seal on a 4.20"+ bore size. Our LSX engine in our twin turbo C5 is a 4.16" bore, and my engine is 4.140" using LS7 heads.

We will have some pictures up shortly on our website of our LSX short-blocks.

Trevor
Texas Speed & Performance

 

I plan to build it 400 to 450 ci and I would like about 500 to 600 hp on pumped gas. It will only be driven on weekends and to car shows, and I want it to sound nasty. I dont know if I want to put a 4 barrel intake or fuel injection on it. It will have a 6 speed and ford nine inch. I dont know what gears to use in the trans and rear end

 

On a small goal like 500-600 horsepower, you can simply do a 402 LS2 or 408 LQ9 block.

You'll make damned near 500 horsepower on a cam-swapped 346ci LS1 and damned near 600 on a heads/cam 346ci LS1.

The new LSX block is for people who are trying to make 700+ horsepower on motor without completely destroying their wallet. The sky's the limit

 

i dont think there is any way around breaking your wallet getting 700+ hp. not that cheap to get there, and then all the supporting mods like a 12 bolt, tranny rebuild, and fuel system add up quickly. i would image it to be at least a $10k project.

 

kraest do you think the ls 364/440 would be a better option, and add a hot cam and heads to make that kind of power.

 

^ Talk to a specific engine builder for cam options.. FWIW: The cam going into my 408 is going to be something along the lines or 232/240 duration on .630" w/ 113 LSA..

The GM Hot Cams are typically pretty mild.. For a bigger engine, I'd advise the Trick Flow Heads, or AFR's.. THat's what my builder uses..

 

I wouldn't buy the crate engine to tear apart and change heads and cam. Get an LS2 short block ranging from stock at 364 up to 400+ then get a set of L92 heads and the new matching carb intake from GMPP then pick a cam. This will put you where you want to be power wise in an affordable combo.

 

Not if you're going to change everything. Start off with a forged LS2 402ci shortblock for $4000 from one of the vendors on the site and add from there. L92 heads from GM are around $900 for a pair.

Mike

 

Hate to break it to ya, but that's not nearly enough cam for a 408 unless you retard the **** out of it. My 238/240 cam installed 4 degrees retarded makes peak power at around 6000 rpm... luckily I have 248cc heads.

A cam that small might make power around 5500 rpm if installed as ground with 3-4 degrees of advance.

Mike

 

$10k for that new stuff vs $25k for a wet-sleeved LS1, C5R heads, etc.

 

A 511 LSx w/ a mild turbo setup would make for a very nice street engine...

And I thought the LS7 heads were already CNC'd. How much further can you take it? The flow numbers pretty much top everything else, except maybe intake flow on the ETP canted valve setup...

And does anybody know if they're making 4.5" cranks for these things yet? There's not even that many 4.25" cranks out yet.