The 425-HP Chevy Impala That’s Harder To Find And Cheaper Than The 427
Of course, it’s hard to resist the legendary 1966 Chevrolet Impala SS 427 with its stout power and tire-shredding performance. But what if I told you that you could save with an even rarer model that has some amount of brawn? Seriously, skipping the 427 for a different Chevy Impala gives you the same horsepower and torque. Best of all, this overlooked muscle car often saves about $20,000.
The 1966 Chevy Impala SS 427 Gets All The Glory
It’s pretty clear why collectors drool over the 1966 Chevy Impala 427 and its big-block V8 engine that brings the heat. It was an accidental sleeper model with the ability to crush smaller, mid-size muscle cars like the Chevy Chevelle SS 396, Pontiac GTO 389, and Buick Skylark GS 401.
The 427 cubic-inch (7.0-liter) Mark IV big-block V8 engine delivers 425 hp and 460 lb-ft of torque. It helps the Impala SS 427 accelerate from 0 to 60 mph in about 5.8 seconds and complete a quarter mile in roughly 14.4 seconds at 98 mph. Plus, this full-size muscle car has a top speed of roughly 140 mph.
But the Chevy Impala SS 427 also attracted buyers for other reasons. It maintained its larger size while other automakers were shifting to smaller, mid-size builds without being too heavy to impact its performance. The car also maintains a sleek and sophisticated style. It’s praised for having poise instead of being too flashy and loud.
It was rare to find a muscle car with plenty of daily driving comfort and potent track performance. On top of that, the Impala 427 is pretty rare as only an estimated 6,357 models were produced during its three-year run. Only around 2,124 units were produced during 1966. But there is a Chevy Impala SS model living in its shadow with an identical amount of horsepower.
1965 Chevrolet Impala SS 396 L78 Has The Same Amount Of Power
The 1965 Chevy Impala SS 396 L78 is an exciting one-year special that’s often overlooked. It was introduced to replace the aging 409 W-Series big-block V8 engine that was immortalized by the popular Beach Boys’ song, “409.” It was also designed to be a serious competitor in the horsepower wars as muscle car competition was rapidly increasing.
It received the 396 cubic-inch (6.5-liter) V8 engine as part of the Mark IV Big-Block engine rollout that was part of Chevrolet’s experimental 427 mystery motor evolution. It was derived from the 1963 Daytona 500 race engine. The top-tier L78 variant churns out 425 hp and 415 lb-ft of torque with an 11.00:1 compression ratio.
It only produced 375 hp in the Chevelle due to a corporate policy limiting passenger cars to one horsepower per 10 lbs, to avoid overshadowing the flagship Corvette. But this engine allows the 1965 Chevy Impala SS 396 L78 to accelerate from 0 to 60 mph in about 5.9 seconds with a 14.5-second quarter-mile time. It features a top speed of roughly 142 miles per hour.
The engine has angled valves known as porcupine heads to significantly improve breathing and airflow. It’s paired with a mechanical solid-lifter camshaft, a 3130 Holley four-barrel carburetor, an aluminum high-rise intake manifold, an upgraded oiling system, and heavy-duty four-bolt main bearing caps.
The 1965 Chevrolet Impala SS 396 L78 Is a One-Hit Wonder
This potent engine didn’t last long, as the 1965 Chevrolet Impala SS 396 L78 was only introduced as a mid-year option when it replaced the 409 engine in the Chevrolet lineup. By 1966, Chevrolet expanded its big-block platform to phase out the 396 in favor of the new 427 engine in its full-size passenger cars. Plus, Chevrolet was shifting its focus away from full-size cruisers to smaller, intermediate pony cars like the Chevelle and Camaro.
While Chevrolet no longer offered the 396 L78 engine variant, buyers could still opt for the Turbo-Jet V8 L35 variant. This is the same engine, but it only pumps 325 hp and 410 lb-ft of torque with a 10.25:1 compression ratio. This decision was made in order to create space for the 427 engine in the lineup. It doesn’t help that this engine was an expensive, niche option.
Because the 396 L78 engine was only built for a few months at the end of 1965, its total production was extremely low. Historians estimate that the engine was only installed in about 1,800 to 1,838 full-size B-body Chevrolet models. As a result, it’s much easier to find surviving 427 engines.
But The 1965 Chevrolet Impala SS 396 L78 Is More Affordable
You would expect the powerful and rare engine option to hold more value. However, the potent 1965 Chevrolet Impala SS 396 L78 is often found at $20,000 less than models equipped with the 427 while still providing the same amount of horsepower. Being an overshadowed sleeper makes it a great option to hunt for.
The value of 396 L78 models hovers around $17,000 to $75,000 depending on quality, condition, and body style. SS coupes found in average condition typically range in price from $42,000 to $58,000. But highly documented examples found in pristine condition may cross the auction block for $75,000 to over $80,000 during major events.
Meanwhile, the 1966 Chevy Impala SS 427 holds significantly more value, with a range of $44,000 to over $90,000. Models found in good or average driving condition start at about $35,000 and $50,000. Then high-end investment-grade models sell from between $75,000 and over $90,000. So, going for the 396 engine, which paved the way for the 427, can deliver substantial savings.
Source: Automobile Catalog, Hemmings, Hagerty
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