Corona

700 to 750 crank hp NA only needs roughly 408 to 427 ci using a 6.0 or Ls3 block with around 75 to 7600 rpm. All based on Pump gas. 454 will do the same with less rpm and higher budget starting with the Lsx block.
$2k+ for the block and around $1000+ for machine work.

spanks13

iTrader: (5)

Uses the as cast LSX-LS7 head which is 6 bolt and is a casted version of the CNC production port. Also thicker in the casting and also in the deck surface I think.

Corona

Perfect example 740 fwhp
https://www.yellowbullet.com/threads...sults.1204610/

rkupon1

iTrader: (3)

That guys video is what made me NOT order up a 454lsx. Watch the video with a 40mph roll on on NT05DRs. Barely got out of its own way...imho. That thing shooda laid down dual fat burnout marks! It didnt even look like it spun. I simply wasnt impressed.
Yea, aftermarket tho. Not the factory ls7 s that come on the 570 wet sump set up.

SLOW SEDAN

iTrader: (13)

Basing a whole series of engines on one cars results doesn't make much sense. I went from a LS2 w/LS3 heads Maggie 1900 to an LSX454, it made more torque, almost same power, and was faster. Had ZERO issue turning 28x10.5/15's to smoke! I had a TH400 with 3.7 gear behind it. I did an SD tune with an LS7 Vic Jr on top. The LSX454 made a good bit more power than my MAST 416, fancy heads, higher compression engine did that cost about the same all said and done.

Corona

👇
Size (Lives) Matter 🤣



Rpm (being) Needed and the amount of Tq needed is generally the best way to go about things

Your car/truck weight + gear/trans are a Dead giveaway and it's Usage 😉

LaBLKv6Z

iTrader: (13)

I'll agree to disagree, car rolled out hard and put the power down. No telling what clutch, rear gears, or if it did spin judging from the quality of the video. His build thread below.

https://ls1tech.com/forums/appearanc...on-lsx454.html

rkupon1

iTrader: (3)

And that means what compared to the vids "I" saw? You didnt really state much in your arguements. Just more "opinions". Like saying ID injectors arent worth the money or any better than Bosch 210s. That is your opinion n your experiance. Im all about comparing stuff, but itd be nice if you used more specific info. My comment was in response to the guy qouting the Red Baron as "kicking ***". Im sure the lsx454 is a nice set up. But "in my honest opinion" its typically underwhelming. For whatever reason. I was strongly considering buying one for my car.

spanks13

iTrader: (5)

I would not call his car underwhelming but hard to judge from a highway roll-on. It is a 9 second car that doesn't appear to be a flyweight running 6.20's in the 1/8.

For a drop in and go crate engine the LSX454 is a pretty good piece. It can be better with some massaging but all that's really needed is a cam and intake swap for 700hp. Rated at low 600's with a stock ls7 intake, stock ls7 throttle body, and a 236* intake lobe peaking at only 6200 rpm. Put an MSD intake or single plane and something like a 250/266 on 113-114 cam in it and it'd fly on pump gas. If you don't mind taking the heads off then clip the heads to 12:1 compression for 93 octane and let it rip. The weight is the biggest concern...well, and I personally hate the orange paint lol.

rkupon1

iTrader: (3)

Its not what id want for 620 hp. That is underwhelming imho for 454ci. Yes, it serves a purpose as is. Post #3, I was thinkn same thing you are. I get that, hence why I almost bought one. But once you get into pulling heads n changing a bunch of stuff, or building it from scratch, theres really no reason to use it as is. OP said he was gunna build it himself and wants SC ls3 numbers. That to me, takes the crate motor out of the equation. I could be wrong, and I wont argue that. But with all the above mentioned variables, it seems less n less like a good fit for his plan. Bottom end maybe, but he gunna need some top end and induction to get after his goals. More than one way to skin a cat im aware. I have no doubt dudes car is/was evolving at the track. But a roll on is a roll on. And Id expect a built 454lsx to burn them nittos down from 40mph. He claimed in the video he was testing the tires, so i m lead to believe he wasnt in 6th gear messing around, or limping it on a break in tune. Also, that is not the only video I ve ever seen of a 454lsx. Im just saying, that one didnt impress me. Lotsa variables im sure.

SLOW SEDAN

iTrader: (13)

Because it wasn't an argument, it was a statement based on my experience. Not sure what is underwhelming about them, but maybe you are used to running 8's NA with a similar setup, different people are used to different things. In my case I sold the cam/bolton/blower combo I had that ran low 10's and picked up the LSX for about the same price. It worked for what it was, walked plenty of blower cars, then I sold it and moved on to turbos.

If you want ID 2000 or 2600 or whatever they sell go buy them and be happy, I don't care as you aren't spending my money. When people offer me their cash/credit card to build a car I try to get them the biggest bang for the buck. Some guys just want expensive parts so they can brag at cars and coffee, that's not my scene.

SLOW SEDAN

iTrader: (13)

Not sure what that means, mine was in a family car that was ~3800-3900lbs. I revved it to ~7600 and ran 1 7/8" headers to dual 3" exhaust so it wasn't annoying. I beat the crap out of it and never had an issue. That engine ended up getting turbo'd and now is going in a car with a 2.9 whipple on top of it.

Corona

You said :
I went from a LS2 w/LS3 heads Maggie 1900 to an LSX454, it made more torque, almost same power, and was faster. Had ZERO issue turning 28x10.5/15's to smoke! I had a TH400 with 3.7 gear behind it. I did an SD tune with an LS7 Vic Jr on top. The LSX454 made a good bit more power than my MAST 416, fancy heads, higher compression engine did that cost about the same all said and done...
All Different engine builds Same 3800 lbs car. Blower Helped with the Weight vs the 416 having less Tq, the 454 Helped with tq. IDK if the 454 had SC or Turbo TQ but the added .125 crank stroke Helped. Besides the bigger Bore.

That said, the Guys asking for SC Ls3 numbers..
650+ fwhp & 600 ftlbs of TQ.
😑

​​​​

SLOW SEDAN

iTrader: (13)

When you add in the weight of the blower, heat exchanger, water, belt parasitic loss, IAT rise, etc, vs the iron LSX vs the aluminum 416, it gets a bit complicated. The blower was closer to 4000lbs, and the 416 closer to 3750lbs.

That said, 650fwhp and 600lb/ft is pretty easy to achieve by any means, that's only 555whp/510wtq. I've seen well built SBE NA LS3's close in on 500whp. In my car 450hp ran 11.3, 600hp ran 10.3 if that helps the computation at all.

Mickyinks

I have a built lsx, 1st go round was with ported ls3 heads , ls3 intake , 239/254 btr cam, that made 540rwhp.
Then went to mamo ls7 heads and msd intake 255/269 solid roller cam and it makes 675rwhp, itll light up the street tyres at 70mph. I drive it every day, tow big loads, ill spin it to 7400rpm every time i get in it
a supercharged ls3 weighs more than the lsx once all add ons are done... i really didnt notice much difference with the extra weight in my car
When i pulled the engine down for upgrade i did notice the piston skirts had a bit of wear but nothing id really worry about plus i dont think the builder specced pistons correctly..
Im happy i built mine and id do it again if going NA

F me

Well I would say that these replies answer my question...I am going to plan an LSX build. If I fall a little short of power a 100-150 shot of nitrous should do it with no ill affects on the forged bottom end.

TTur1996

I'm not sure if you realize that the GM LSX block needs a **** load of machine work and will end up costing a lot more than a Dart Pro Iron skirted Next block. The Dart is all around a much better piece too.

F me

Please read the description. According to this maybe some decking...
https://www.gmperformancemotor.com/parts/19417353.html

SLOW SEDAN

iTrader: (13)

I wasnt aware DART offered crate long blocks, or we no longer talking about the LSX 454? I agree DART is a solid platform if building from scratch, but $3k for a block is some hooch!

$3800 for a bare block is steep when you can get the whole long block with warranty for $9k.

rkupon1

iTrader: (3)

No warranty once he takes it apart or modifies it, so thats out. Also said he wanted to assemble it himself, so why start out with a crate motor under warranty? Between thst n the hp rating he s looking for, i still dont see why he s considering the lsx454. Maybe I missed something. Mickyinks kinda proved my point, he loved his, but it had very little in common with the GM crate motor the OP was asking about. Can you buy the GM 454lsx as a built bottom end shortblock? If so, than thats a pretty good start as your top end options are limitless. Not to mention the lack of wait time for a custom shortblock. This thread is all over the place.

One guy on here once said, GM builds the best motors. I totally get that. If the motor meets your goals, sure is a no brainer
If one more builder wasted my time on the phone, i was ordering the 454lsx or the 570hp wet sump LS7 n throwing my intake on it. I would have been driving my car already n lovn it. But I no doubt made a mountain out of a mole hill n went full custom...again...
At some point, you have to decide what you really want!