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Top 10 American Performance Engines of the Last 30 Years (#1): General Motors LS Small Block

2009_chevrolet_corvette_ls9Editor’s note: The 1980s was a transition period for engine technology in America. The iconic carburetor gave way to fuel injection. Cubic inches were out, and liter designations marked a new era for engines — one when power and fuel economy were no longer mutually exclusive. This modern engine age has featured some of the best innovation, technology, and performance yet.

So what have been the best powerplants of these last 30 years? We asked you to help us answer that very question via Facebook and Instagram. Factoring in your votes and comments, we’ve been unveiling the Top 10 and now we’ve reached #1…

#1 — General Motors LS Small Block

In the mid 1990s, some sensed that the traditional, pushrod-style American V8 had reached its performance limits. And then, like its Gen. I small block forefather, the GM LS engine came along to spark a hot rodding revolution.

Compact, lightweight, and powerful, the original LS1 debuted in 1997 and produced 345 horsepower in the Chevrolet Corvette. The engine used much of Ed Cole’s original formula for the small block Chevy engine’s success — 90-degree configuration, 4.4-inch bore spacing, and a single-cam pushrod valvetrain — but added a few twists. All-aluminum construction on performance models made it lighter in weight; a smaller bore/longer stroke design made it more compact. And of course, modern fuel injection made the LS more efficient than the original Gen I. small block.

The LS engine family (Gen. III and Gen. IV) shared one other important characteristic with the original small block: versatility. The design of the LS platform allowed engineers to create different displacements off of the same basic foundation. Over the lifespan of the LS engine family, engines would be available in sizes varying from LS1’s original 346 cubic inches to the 427-cubic-inch LS7 — the largest small block ever!

The LS7 debuted in 2005 and ushered in the Gen. IV small block. The Gen. IV LS shared the same basic architecture as the early LS engines; however, it added new technology such as displacement on demand and variable valve technology. The Gen. IV lineage includes such legendary engines as the LS7, LS3, and LS9 — the supercharged 6.2L V8 that produced 638 horsepower for the Corvette ZR1!

So let’s summarize the credentials for the General Motors LS small block:

  • Historical significance: Based off the legendary Chevrolet small block, the GM LS engine family helped re-ignite the hot rodding scene in the mid 1990s. LS engines have been used in Camaros, Firebirds, GTOs, and Corvettes, including some of the most potent Corvettes ever to hit the streets.
  • Performance potential: Sure, the LS9 gave us 638 horsepower from the factory! But the entire LS lineage is loaded with performance potential thanks to a proliferation of aftermarket parts and the interchangeability of parts between the different LS engines. It’s one of the most hot-rodded engines in American performance history, and its light weight and compact design make it one of the most swapped, too. Nowadays, you can even find LS engines in 1930s and ’40s street rods and trucks.
  • Versatility: From supercharged performance engines to durable truck engines, the LS engine family has something for everyone. In addition to the Camaros and Corvettes of the world, you can find an LS inside a Cadillac Escalade, Chevy Silverado, GMCs, Holdens, and more. The LS platform has proven suitable for about anything!
  • Affordability: The amount of engines produced has made the LS attainable and affordable and the still-increasing availability of aftermarket parts has helped make it practical to work on. What’s more, LS engines are considered fairly easy to wrench on by veteran enthusiasts.

Best LS Engines

Although the GM LS engine family headlines our list of the top American performance engines of the last 30 years, we feel compelled to rank them individually. Here’s our best of the best:

  1. LS9/LSA: Made for the 2009-2013 Corvette ZR1, the LS9 is a supercharged 6.2L engine rated at 638 horsepower — the most powerful of all small blocks. The LSA is a detuned version of the LS9 used for the Cadillac CTS-V and Camaro ZL1.
  2. LS1:  This is the one that started it all! First offered for 1997, this engine featured a smaller bore and longer stroke than the previous two generations of small blocks and made 345 horsepower in the Corvette. More importantly, it laid the groundwork for the rest of the LS family and is one of the most swapped performance engines ever.
  3. LS7: Introduced in 2005, the LS7 sported 427 cubic inches, making it the largest small block ever. It featured the same basis 4.4-inch bore spacing, the LS7 took advantage of new technologies in valve timing to produce 505 horsepower
  4. LS3: Combine an updated version of the LS2 casting (larger bores) with higher-flowing heads, more aggressive camshaft, and revised valvetrain, and you essentially have the LS3. Introduced in 2008 for the Corvette, it delivered 430 horsepower in initial form and has been used in everything from the 2010-up Camaro SS to the Chevrolet SS.
  5. LS6: Following on the heels of the LS1, the LS6 used better-breathing heads, cam, and intake to take things to another level for the Corvette Z06. It delivered 405 horsepower at its peak.

Top GM LS Modifications

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  1. What is best LS for a 55 Chevy

    • Any of them. From the 5.3 all the way up to the ls9. Just how much power do you want and how much do you want to spend lol! LS is definitely the swap to go with,daily drivable,relatively economic,reliable,long lasting and power power power for days !

  2. Ls1 swap time jeep tj 2005

  3. I have a 1997 chevy Cheyenne extended cab originally came with a 4.3 Vortec I took that out I put in a 97 5.7 Vortec and I recently and have been thinking for some time I want to LS swap it 327 do they make wire harnesses to go to your computer or do you have to change the computers out do they make motor mounts do you have to get those custom and dryshaft and transmission mount ? Plz & I would even be open to the idea of doing a upgrades to my 5.7 Vortec increase HP TO 50 to 75 horsepower safely thank you . You read so much on the internet you don’t know what’s true what’s not what’s fake what is not . I looking tor a rough idea. junkyard low mile Engine with transmission may be cheaper to buy the whole truck or one in working order . worth the swap . it’s cheap to do a 5.0 or 5.7 swap . but all ready done that . Will my 4l60e need any modifications to bolt up to a 2002ish to 2005ish LS 327 ANY HELP YOU CAN GIVE ME OR GUIDE ME .I NOT LOOKING TO HAVE A SHOP AT $60 TO VIP$105 A HOUR . CRAZY I have a good friend that did my first motor swap and if he had the brackets the wire harness that went to everything and went to the fuel tank fuel pump we can make it work . THINGS TO LOOK OUR FOR PLZ ????? I know this is a lot to take in
    . and I am all over the place . sorry . if I was LS swap what motor would you recommend . just daily driver / high performance my 97 extended cab is heavy for the 5.7 performance-wise 3:73 gear ratio rear end . 4:11 be to low . again thank you .

  4. Charles A Valenti says:

    05 – 06 ex cab trucks had the option L 33 5.3 all all aluminum block and heads w flat pistons. 310HP fatory . With some small changes easaly 350

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