i was told that gm will be making a iron block lsx motor that will go up to 511ci.

this block will also weigh only about 30-40 pounds more than the aluminum block we have now.

and it will be around 1500$

the person who told me this is not sure when it will be released but he said soon (could be a year could be 3 months :shrug: )

just FYI

 

Damn! If true 600+rwhp no problemo...

 

What platform would the 511 be used in?

Mark

 

If true, I think the head boys better come out with 400+ cfm heads soon

 

I could see the LQ4/LQ9 block being offered in a siamesed version with bores that could easily go to 4.125 and a deck height of like 9.8 or 10.0 for the 3/4 ton trucks and larger. With a 4.125 crank, this would yield 441 CID. I personally don't see GM continuing with the L18 8.1 L because of fuel efficiency. They could make a tall deck varient of the L92 (even with DOD and variable valve timing) and it would eliminate the big block for new production vehicles. The economies of scale by using so many of the same parts (heads, cams, pans, cranks, etc.) would be huge. If they do go to a taller deck height (which is the only sensible way to do it and maintain 4.40" bore centers and maintain parts interchangability), this block may not be easy to directly fit into a Camaro/Firebird/Corvette/Holden and maintain all of the body contours (hood line, etc.). Also, this kind of long-stroke displacement increase will not yield a lot of HP (compared to a shorter stroke smaller displacement engine) above about 5,000 RPM's because of piston speed.

As an observer of automotive technology and an engineer who is a gearhead, I think that this will happen for the 2007 year model trucks rated at 8,600 GVW and above. I have no inside knowledge, it's just my speculation.

Steve

 

TTT,
Has anyone else heard of this block?

Steve

 

hell if this is tru
i say its bout time
i am amazed DART doesnt have a iron block in the works
for lsx applications
i would buy the GM block or a few of themfor1500$

 

this was from my holley friend who talked to WJ at pomona this weekend

 

im gonna guess it wont be in any factory car... only aftermarket/race type applications

 

What do you mean by WJ?

Thanks,

Steve

 

warren johnson... he helped build the ls6,2, and 7 motors.

 

That is the first I have heard of that .

 

what part?

 

ty_ty13,
So are you saying that the guy from Holly told Warren Johnson at Pomona this past weekend that GM would be producing a bigger cast iron block? Now some aftermarket company like World Products, but GM. GM makes the most sense to me.

I'm just trying to clarify this a bit.

BTW, where are you from in Western KY? I am originally from Cleveland, TN (near Chattanooga), but I've lived in Wichita, KS for the past 30 years. When we drive back to Tennessee, we go through the "Land Between the Lakes" area in Kentucky. It's really beautiful there.

Steve

 

no no.... wj was talking to my friend about random things and lsx stuff came up and wj said that GM was coming with a new iron block...


i used to ride my four wheeler in LBL... im about 45 min away from there or 20 by water...

my family/company has a store in cleveland... we race in the gleason/martin area of TN alot.

 

oh sorry... im in the marshal county/ paducah area.

 

Warren Johnson developing the LSx series of motors.

 

We have heard about this but cant find any real good sources. Speaking to Scoggin Dickey they dont think it will be soon. and if it does come out to the public in mass, it more than likely will be heavier than 30-40 more lbs. A typical block made from aluminum poured in iron will usually weight about 100 lbs. more on average. Besides if wheel2wheel can run 6.80's with a highly modded block, when do you need iron?? We (dart) are working on one and it will probably be something we can have to market in the next 3-5 months. And you wont need an iron block, nor will you need extra head bolts. Again if the small block fords can run two turbos and four bolts per head and not have a problem it proves the aftermarket blocks along with high quality fasteners that you dont need extra head bolts. When I say high quality fasteners I dont mean the standard ARP stuff, I am talking A1's H11 fasteners or the ARP S2000 stuff, stuff with over 210,000 KSI strength.

John
Dart Machinery Ltd.

 

Is there any article i any magazine that talks about this 511ci block?
This would be what I'm looking for, big cubes of small block genIII.
The General will need to design heads that will flow over 400cfm.

 

John,
I agree with you that cast iron will be a 100 pound increase (just like the LS series versus the LQ series is now). If the deck height is increased a bit and the bores are increased and siamesed together, I could see a 110 pound differential in aluminum versus iron versions.

I do believe (again just speculation) that GM will develop a tall deck variant of the iron LQ block for the trucks, increase the displacement and discontinue the 8.1 L. This block might not be suited to performance applications at all, but I think that it may happen.

What are your thoughts on my line of reasoning?

Steve