this whole talk of bbc and ls i say ls hands down. but hey if yall really want to race ill race in my sisters pink tricycle that will put up a fight against that 8 second car lol i kid i kid
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this whole talk of bbc and ls i say ls hands down. but hey if yall really want to race ill race in my sisters pink tricycle that will put up a fight against that 8 second car lol i kid i kid
Yeah, pretty much is the same engine, only cast in aluminum and w-out water jackets. of course so many mods are done.. but the overall design is all mopar... no other auto engine on the planet can match the hemi for all out boosted power.Quote:
Originally Posted by PurpleMinivan
back down to pro stock level and the ports of the BBC are where the power is, ports on the hemi are too big.
Quote:
Originally Posted by Mang213
I've never owned a Big block Chevy, but have 2 ls based vehicles... know people who have bbc autos..
I can tell you the LS is somewhat an engine from heaven.. WE got into this debate a few days back with the I-force 5.7 Tundra engine vs the ls engine...
Even with v 4 valves per cylinder racing heads that probably cost $12,000 pair, the Tundra's engine could never hang with a Ls6 stock for stock, or esp with mods... the ls6 would be 100-200 more hp with 4 valve heads... it is just an incredible engine ...
For the street I'd much rather have a 11 sec 30 mpg ls powered z28 than a rat powered 10 sec 69 camaro that gets 7 mpg..
But to say a LSX vs BBC same cube and the LS would make more power is crazy.. the Big Block chevy also has been keeping up with modern technology..
a 427 BBC vs a 427 lsx, a 454 bbc vs a 454 lsx, a 500 bbc vs a 500 lsx..
The Big block chevy will prevail.. sure it had to spin a distributor etc, but the heads on the BBC are big and flow like no Ls can dream off..
Just one example
go to the AFR web page.. look up LS heads, then look up there Big block Chevy heads..
those tiny AFR heads (I'd love to have a pair don't get me wrong) are nothing to the GIGANTIC BBC heads...
Some of those Big block chevy heads have 2.19 intake valves.. and some have huge pop can sized 2.25 2.30in intake valces... flow 360 cfm just playing around...
sure a LS7 vell will destroy a 90 SS 454 truck or a ls6 1970 Chevelle.. stock..
but when you put the same $$ into them... I'd no bed agaist the BBC if it is built right...
After looking at vig again, looks like the Nova may be a older small Block chevy, it is dark though, still proves old school engines can make power, magnify this for a RAT moter.
Here are two guys, who supposed to had a argument over the net or something, bad mouthing.. one is a 02 Vette with a (not stock engine of course) built LS7 (SPRAYED).. the other is a old school 72 Nova (SPRAYED) .. with a RAT motor in it..
Both cars ran great.. both are 9 sec cars I believe
a $1250 bet, both trailer to race site on some old road somewhere..
YouTube - $1250 Race - '72 Nova vs '02 427 ci Z06
Good running and sprayed LS7 2002 Vette, but he lost $1250 cause he thought the LS was superior and found out that you don't mess with a good running BIG BLOCK CHEVY..
Ls engine are great, but those pop can vales, mop bucket pistons and high flowing aftermarket heads are nothing to take lightly.
The Fastest street cars on earth... 2000-2500 hp.. are not 1500 hp 6 cyl turbo imports, are not hemi's, are not LsX's either... they are Boosted Big Block Chevy's!
Best thread Ive read in a long time. Personally I love them both, each has advantages and disadvantages just depends on what you're trying to do. All out racing, BBC for the win.
Now, what do you say we get back to LS only topics. Maybe damnyankee can help us out here with some new pics of his Titan
I love the LSx. And I believe it is the future of hot rodding.
But there's nothing quite like a bad boy big block Chevy.
The car in this vid is kind of ugly, but the big block in it makes up for it. Unbelievable power on the street!
YouTube - NRE 522 Big Block Twin-Turbo '63 Pontiac Tempest
And for those praising the new LS7, you must remember the first LS-7, the now 40 year old 500hp flat tappet 454 LS-7 big block crate engine.
Of course if you are looking for something a little more up to date than the 40 year old LS-7... you would be looking at the highest horsepower passenger car engine currently offered by GM, the ZZ572 big block. Under rated at 720hp, but actually makes around 800hp right out of the box. Add nitrous and you would have over 1,000hp the easy way. This engine would eat ZR1 Corvettes for lunch and it's available at your nearest GM parts department.
http://www.gmperformanceparts.com/_r...GB_DELX_03.jpg
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.
My point about comparing both engines with the same bore and stroke is that is the only way you can match a bbc with an LSX, when trying to determine which engine is more effective at what it does, all things being equal. The LS is much more efficient and makes more use of its available power. Of course you can take a bbc and bore/stroke it out for more cubes to gain an advantage, but we were talking about motors of 454 ci, not a 502, a 572, or whatever else you want to throw against the wall. A 454 LSX with the same bore/stroke as a 454 bbc, the same compression, with heads that flow equal amounts of air, and with the same profile camshaft, will almost certainly make more power. I dont really see how anyone can deny this, as long as we are staying on topic with the OP. Put it this way, 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.
im out of breath now, but great topic
So you compared a high compression motor to a low compression motor and the high compression motor won. Nice job. What a waste of bandwidth.Quote:
Originally Posted by truckinL33
Not only that but you made the 454 HO produce less than the GM hp rating, which is probably under rated by GM.
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.
Some of you need to learn a bit about the history of Chevrolet.
Get real. The LS7 is the second highest horsepower LSx motor currently produced by GM. Compare it to the second highest horsepower big block produced by GM. The 620 horsepower 572, which actually produces around 700hp. It would eat the LSx LS7 alive.
O yea, I forgot. It's the internet, EVERYONE IS IGNORANT.