did some quick internet browsing. I have seen a couple 454 LSx engines, but they seem to be with an iron block. anyone know if the Al block would accept the power levels, while still being reliable enough for a DD? I am thinking ratgher than take the weight of a LSA, might be fun to buy a SS/RS and stroke and bore the motor to 454 cu. in.

 

Not gonna get 454 cubes out of the LS3

The iron 454's you're seeing are LSX blocks

If you wanna stay aluminum, you could stroke the LS3 to somewhere between 412-420 cubes...or just go LS7

With emissions not in mind...

LSX 454...potentially 620whp n/a

could make between 530-550whp with the LS7 or stroked LS3

 

Cool, thanks for the info man! Not going to do it for a couple years, but I like to have plans in the works, makes saving that much easier !

 

Not sure if this is clear... GM Performance Parts sells an aftermarket block that is actually called the "LSX". The 454's you're seeing are built with that block, not a bored/stroked iron block from a truck.

The LSX is actually pretty impressive. Supports up to 510 cubic inches, supposedly good to 2500hp. If I were building a race car, that's exactly where I'd start.

 

I've seen a 500" aluminum block LS2. It was made using deck plates by ERL and I believe Darton sleeves.

A 427" LSX can be built to make 900hp naturally aspirated. A 454 or 500" could potentially make more.

 

Yeah, thanks for the additional info guys. I would like to keep with the Al block. Once the warranty runs out ( if not sooner) I am thinking a 427 bore/stroke job from Lingenfelter sounds good.

 

Yeah, not saying it can't be done... but now that the LSX is available, that's the expensive way.

 

Thats gonna cost ya...

I'd look into LME, Katech, or even TSP first.

 

Here's a question. Can the Ls3 have it's strokes lowered to become a 6.5L 396?

 

Thanks for the additional names, I'll check them out as well!

 

The LS3 is a 6.2L with a 4.065" bore and the same 3.625 stroke as the LS1/2/4/6 and every 5.3 and 6.0. I guess you could increase the stroke to 3.8" and hone it out to 4.07 to get 396" but a 4" stroke crank fits fine to get over 415cid.

 

Cool, so it's possible to make the car a little more historically accurate. Not to mention kick a little more ***.

As for the 454... I don't know that I'd want to get involved with engine transplant on a car that has more monitors than a POW camp. Something isn't going to be right once everything is all said and done. But I suppose the same thing can be said for any other mods you do on this beast...

 

How about this... If a 4" throw crank fits a factory engine of the same design, then a 4.100" crank should fit. Combine that with a minimal clean-up hone to 4.070 and you've got 427cid

 

This is exactly what TSP does, you can either pick up a 416 LS3 or a 427 LS3. I'd look into either of these choices and some TFS 235 or L92 heads. You can use the Fast LSX or LS3 intake and make some real power, usually in the 510hp and 480tq range. Just check out the dyno results on ls1tech

 

This site doesnt have much LS talk. I agree if your building a current motor LS1tech is much better to talk. A while back the LS1 section here still would move but recently has been in a stand still.