Why not more 454's?

[TATERNATOR]

it was a stock for stock comparison but wanna be XLR8N can't read

[IXLR8]

it was a stock for stock comparison but wanna be XLR8N can't read

The 454 HO never came stock in a car. But the L-88 427 big block did 43 years ago.

[scottyd2506]

Ok guys, ran some desktop dyno numbers on a stock LS7 small block vs. a 454 H.O. big block. I used merlin ported heads on the big block, because we all know it's not fair to compare stock LS7 heads to the stock 454 H.O. heads.


STOCK LS7 SMALL BLOCK

RPM -- HP -- TQ
2000 - 208 - 547
2500 - 272 - 570
3000 - 334 - 585
3500 - 394 - 592
4000 - 438 - 575
4500 - 473 - 552
5000 - 493 - 517
5500 - 491 - 469
6000 - 468 - 409
6500 - 444 - 359
7000 - 403 - 302



STOCK 454 H.O. BIG BLOCK w/ merlin heads

RPM -- HP -- TQ
2000 - 198 - 520
2500 - 255 - 536
3000 - 310 - 542
3500 - 360 - 539
4000 - 397 - 522
4500 - 416 - 485
5000 - 414 - 435
5500 - 394 - 376
6000 - 361 - 316
6500 - 336 - 272
7000 - 284 - 213

Now some of you may not agree with these numbers, but I used the same method of construction for both engines. The LS7 is an 11:1 engine, while the 454 is a 8.75:1 engine. Also, the LS7 heads flow more than the 454 heads. This was just for a comparison between a STOCK LS7, and a STOCK 454 H.O. Infact, I helped out the big block with ported heads, and it still came up short.

Yeah, that's a low compression big block smog motor,
Ls7 heads flow more than crap BBC heads ,but not more than good aftermarket BBC heads. Merlin makes some heads that flow 400 cfm and more.... would not be good on a 8:1 454 though.


I love LS motors just like you guys, but they are not king of V8's..
I can tell you that not only will good Big Block Chevy's rock a good LSX engine, but also Big Block mopars with the right heads..

many 440 RB engines with 500 cubes and Indy 440-1 heads can get 800-1000 HP EASY without spray or boost.

look at NHRA pro stock engines, they can use ANY production V8 up to 500 cubes IHRA is 700 cubes I think.. they can use a LSX if they wanted, nope.. use old iron BB Ford, Chevy and Dodge engines.. Hemi's I think have to run 1/2 lb per cube more weight on car..

I know there are aftermarket LS style engines that can get over 500 cubes,,,,
But keep in mind there are aftermarket Big Block Chevy engines that can get 800-900 cubes,, Arias even makes hemi heads for BBC..500 cfm plus flow...
So when ever you pull up next to a Chevy car with a Big Block in it... better not bet a bunch of money on that LS.. cause if the Rat is built right, your going to see some old school car tail lights.

This is a fun thread...

maybe if those old Big Blocks of 40 years ago was never invented, then the LS engines would be supreme.

[TATERNATOR]

I know but it was the motor he chose though

[IXLR8]

I know but it was the motor he chose though

And he chose the wrong motor.

[TATERNATOR]

O and I love the sound of a BBC done right

[IXLR8]

The LS6...ZL1....427.... the 500hp LS7, and more, are all revisits of legendary big blocks of the past.

The Z06 is also a revisit of the legendary Z06 Corvette of the early 60s.

[cjriojas]

The 40 year old LS-7 454 big block matched the output of the new LSx LS7. The 43 year old L-88 427 big block also matched the output of the new LS7. The L-88 was very under rated, but it regularly pumped out 500+ horsepower on the dyno way back in the 1960s.

Wow, you are a freakin idiot. the horspower rating changed in the early 70's. Not to mention that the dynos back then were rigged to show higher power. do some research on the dyno and you will find exactly what i typed.

Why do the BBC guys find it necessary to challenge a SMALL BLOCK 427 with a 572? that is the most ignorant thing posted in this thread. Why did GM COMPLETELY phase out the BBC from its vehicle line? i think it had something to do with the fact that there are better ways of making power than just all out big cubes. Oh, and the hippies didnt help either I am one of the biggest fans of the L88 and ZL1 but the L88 has been replaced by the LS7. Nothing would make me happier than slapping an LS7 in a stingray and whoopin on some big block ass

Case in point: Pound for pound, dollar for dollar, mod for mod, cube for cube, the LS will always outperform the BBC's.(by outperform i mean do it all, daily drive, mpg, make power, reliability, etc.)

[scottyd2506]

if GM developed a big block Chevy that was designed after the LS architecture (not an LSX block, but a true big block with a raised deck, 6 bolt mains, cam higher in the block, and larger bore centerline), it would blow the existing bbc out of the water.

I would agree on this...a 5 inch bore spacing lsX big block engine would be scary...4.5 inch crank.

Still the Big Block Chevy as it stands now is king, lots of modern tech can be added to them... even Crank triggers for Computer injection and timing.. although that gets expensive.
Good thing for us LS owner car guys, that they are rare to be seen now. and most or old worn or smog engines.

I didn't start to study LS1 engines till around 2008... I assumed in 1997 when the Ls1 came out in the Vette, and again in 1998 in the Camaro that this new engine would never be like the Lt1 or old school SBC..
90% of the time new is not always better, but GM did good on the LS1...

[IXLR8]

The EPA forced the phase out of the big block. There was no such thing as a high performance V-8 after the early 70s. As the car manufacturers got better at emissions and mileage the motors started to make better power. Then they started to get bigger again. That's why you now have a 427 again.

But it was too late for the big block. You can still get them at the parts department, you just can't get a good one in a car anymore.

If GM spent the money on the big blocks they would match everything the LSx does better than you might think.

The big block naturally has more cubes than a small block. That's why it's a big block. To utilize the advantage of a big block, it's going to have a lot of cubes. If you want to compare a small block to a big block you are going to have to live with the fact that the big block is going to be bigger. Get over it.

Why are some of you so immature that you can't type a post without insults?