Curvette1

I know this is not about Corvettes, but close enough to be of some interest....maybe?
Back in 1954, when Bill Haley And His Comets were hitting their stride and “jet set” referred to people who actually flew places, General Motors introduced the Chevrolet small block V8 engine. A marvel of compact design, technical innovation and (relative) fuel efficiency, it didn’t take long for the potent powerplant to end up in everything from milk trucks to race cars.

The little engine that could was heralded with the usual corporate fanfare, but few expected it to be the unmitigated success it became. It transformed Chevrolet, helped drive America ’s love affair with performance and became one of the 10 best engines of the 20th century. Fifty-six years later, GM says Chevrolet is about the crank out its 100 millionth small block Chevrolet engine.

Sort of. Actually, not really.

General Motors will crank out a V8 Chevrolet engine that is a descendant of the engine that first appeared in November, 1954 for the 1955 model year. But it isn’t the same engine at all. Contemporary Chevrolet V8s have little in common with the original small block Chevrolet beyond eight cylinders, a single shared dimension and a pushrod valvetrain. So it’s a faux milestone, heralded during GM’s 100th anniversary. But that in no way detracts from the original’s place in history, because the small block Chevrolet engine remains GM’s Mt. Everest .

The V8 engine was something of an anomaly before World War II, when most automakers offered inline fours, sixes and eights. That changed after the war as consumers demanded more performance and power.

Chevrolet was among the last to the V8 party, offering only a straight-six from 1929 until 1954. It was a fine engine but lacked the oomph consumers, particularly the growing post-war hot rod culture, wanted. GM chief engineer Ed Cole set out to design a powerful, light and affordable V8.

Cole’s answer to that equation was elegantly simple: A compact, efficient 90-degree V8 engine with overhead valves, pushrod valvetrain and 4.4-inch on-center bore spacing. The first engine had a displacement of 265 cubic inches and delivered 162 horsepower with a manual transmission and 165 with the PowerGlide. An optional Power Pack with a four-barrel carb and dual exhaust bumped output to 180, and a hotter cam offered later in the model year brought it to 195. The engine appeared first in the (now) iconic 1955 Chevrolet (pictured).

The engine was revolutionary for its light weight, compact size, general simplicity and remarkable durability, said John Wolkonowicz, an automotive historian and former industry analyst. Although there were some hiccups during the first year or so, GM worked them out and the engine quickly became a hit.

Consumers loved the performance and fuel economy, which was on par with the six-cylinder engine it replaced. Racers and rodders loved its performance and light weight, quickly dubbing it “Mighty Mouse.”

“Until the the small block Chevrolet, the flathead Ford engine was the rodder’s delight,” Wolkonowicz said. “That shifted right away when the small block Chevrolet came out. It was small, it was light and it lasted forever. Hot rodders loved it.”

They still do. Even now, you’ll see the small block Chevrolet and its descendants, the LS and LT engines, almost everywhere, powering almost everything. There are no end to the tricks tuners can use to generate enough torque to move houses and enough horsepower to seriously warp your perspective of time and space.

“The performance of the small block transformed Chevrolet,” Jim Campbell, vice president of GM Performance Vehicles and Motorsports, said in a statement. “The small block made Chevrolet the weapon of choice for grassroots racers on the drag-racing and sports-car tracks across America .”

You’d expect him to say that, of course, but it isn’t hyperbole because it’s true. The ubiquitous engine has appeared in everything from stock car racing (more NASCAR wins than any other engine) to drag racing to endurance racing, not to mention an ungodly number of hot rods built in the past 50 years.

The original small block Chevrolet grew in displacement and output over the years. In 1957, the 283 cubic-inch engine fitted with Rochester fuel injection became the first engine to produce one horsepower per cubic inch. The 350 cubic-inch variant appeared in 1967 and eventually appeared in everything from station wagons to sports cars. It almost certainly is the most popular small block V8 engine of all time. The first-gen small block engine reached its zenith in size and performance with the 400 cubic-inch monster in 1970.

The 400 cubic inch was prone to durability issues — the larger bore placed the cylinders so close together they weren’t surrounded by water jackets, and the engines often started burning oil at 50,000 miles — but other small block Chevy’s were generally bulletproof.

“By the time the engine was truly perfected in 1970, 300,000 miles was the norm for a 350 cubic-inch small block Chevrolet,” Wolkonowicz said. “It was a beautiful, remarkable engine.”

Those with jaundiced eyes might say, “Yeah, yeah. That was then. What does an engine designed half a century ago have to do with getting down the road in the 21st century?”

A lot, actually. The DNA of the small-block Chevrolet can be found in modern GM engines.

General Motors revamped the small block when it introduced the LT engine in 1992 to comply with tightening fuel economy and emissions regulations. The LT had a displacement of 347 cubic inches, even if it was called a 350. It featured, among other changes, reverse cooling (in which the coolant flows down through the cylinder heads into the engine block) and an optical distributor mounted at the front of the engine. But it was, at its heart, the same engine Cole designed.

GM went back to the drawing board for the LS engine, which first appeared in the Chevrolet Corvette in 1997. Yes, it’s a V8, but it’s not a small block V8.

“Everything is different,” Wolkonowicz said. “The only thing that’s the same is it’s a 90-degree layout with pushrods and a 4.4-inch on-center bore. Every other part of the engine has been redesigned.”

That doesn’t detract from the significance of the original, or the potential of its descendants. GM has stuck with the general design all these years because it still offers the same benefits: small size, light weight and excellent power.

“As fabulous as the original small block was, the new small block is better in every way,” Wolkonowicz said. “It’s more durable. It’s got more performance. It’s quieter. It’s smoother. It is is capable of better fuel economy and lower emissions. It is simply a much better engine. It is to the 21st century as the original was to the 20th century.”

Kerrmudgeon

Thanks, I've had my 56 for 40 odd years, so I appreciate any archival material. Right klik saved pics.


I just saw who's thread this was!!! Hi Suzan, it's about time you paid a visit here! Thanks for that, I'm sure you may have had someone? in mind when you posted it! hehehe!

oldsarge

Kool info, thanks for sharing, always liked the looks of the 56 chevy.

sub006

I don't recall the SBC being called a "Mouse" until the "Rat" appeared, and I don't remember rodders referring to it by that nickname prior to 1965. It was just the Chevy V8, first one since about 1917.

KS69Coupe

Thanks for sharing - great historical information.

I've driven exclusively small block Chevy's all of my life and in all of the Chevy cars that I've owned. I'm very partial to the 327 cubic inch, which is my personal favorite. I've wanted a 427 Rat Motor for a long time but I'm still driving the old Mouse Motors and just love them.

Kevin

vetrod62

The mouse name came about when comparing it to the Hemi's of the day. The physically huge Hemi from the front kind of resembled an elephant with the huge heads looking like the ears, hence it was nick named the elephant motor.

Many of Hemi's were scared by the little mouse. The Rat name just followed the rodent theme.

Vetterway

Did you mean 1955?

Vetterway

vettsplit 63

Curvette 1 ,

As someone who can appreciate a well turned phrase, I must congratulate you an an extremely well put together story. It reads easily, and flows well. Nice visuals too. Good job!

rustylugnuts

I thought that too, but believe he was replying to Kerrmudgeon 56.

rustylugnuts

Railroadman

OK, had not thought of that, I just assumed it was a copy-and-paste from a published article. If that's an original, Curvette1 take a bow!

Kerrmudgeon

Suzan know a little about cars, but not that much. I'll find out where she found that article.

C2Driver

Hi Rob. Just saw this thread. A quick Google found it all over the web. Here are but 4 of 13,700 results.

http://www.wired.com/autopia/2011/08...e-that-roared/

http://www.valveinteractive.com/pres...e-that-roared/

http://www.artrick-playground.com/ar...ed/1954/352531

http://www.chevrolettoronto.com/chev...e-that-roared/



- Pat

Oh 2 Fun

Still take a bow!! It was a good find and nice to share.

w1ctc

I have great fun when making the point that the small block chevy was not produced untill 1965.

Railroadman

You lost me on that one - they're not saying it wasn't made until 1965, just it wasn't called a mouse motor until 1965, after the rat motor was introduced.

Or am I not awake yet? There should be a law against mornings!

w1ctc

Just a word trick. You can't have a small block without a big block (the 348/409 was never called a big block)

Kerrmudgeon

I'm not old enough to remember, but I'm guessing it wasn't called a small block until 65, right?

Railroadman

Ahhh - NOW I get it!

Curvette1

Hi everyone,
No, I didn't write that article , a friend sent it to me and I thought it was of enough interest to post it on here. I hope you enjoyed it.

Suzan

Railroadman

Thank you Suzan, a good read regardless of who wrote it!