The big block engines are a series of V8 engines developed in the States between 1950s and 1960s. It was produced under the Chevrolet Regular Production Option Z11. The 427/425 HP L72 engine was the pinnacle of performance for Chevrolet in 1966. 427/425HP engine had a casting number of 3869942 and was stamped as broadcast code "ID" from the Tonawanda Engine Assembly Plant. This engine had an overhead valve design with offset valves and uniquely scalloped rocker covers, giving it a distinctive appearance. Chevrolet sold it in 1963 as an option. A Chevy equipped with a Yenko 427 could go from 0 to 60 mph in 4.7 seconds.This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. 427/425HP engine include larger rectangular port cylinder heads (casting number 3873858), an aluminum intake manifold (casting number 3885069), and larger, more header like exhaust manifolds (casting number 3880827 for the left hand side and casting number 3880828 for the right hand side).427/425HP engine from other '66 Big Blocks were the 780 CFM Holley Carburetor (Model 4150, List 3246), the 3 groove lower crank pulley (casting 3869978), 2 groove water pump pulley (stamped 3864480), and the infamous "idler" pulley (part number 3765393).

Exact model specific production totals are not available, but most of the cars assembled with this fabulous engine were Impala and Impala SS 2 Door Hardtop models (about 1250). The unique 427 cubic inch version of the 409 was utilized by the Chevrolet Impala Sport Coupe. All of the pulleys for the L72 were of the deep groove variety to make sure the fan belts stayed in place.To keep the L72 engine cool, a large 4 core "CW" Harrison radiator (part number 3007719) was utilized (The L72 was the only '66 Chevrolet to use the 4 core. Even though it was the top engine in the Chevrolet line-up, only 1856 L72 full-size cars were produced out of a total of 1,499,878 units built the 1966 Model Year (0.0012%). 490 LB-FT @3800 RPM. From 1988 till 1995, the 427 was made available with throttle body electronic fuel injection system. Post the Second World War, American vehicles were built larger and heavier which also required stronger engines to power them.

Today you can still find a lot of performance engine parts for the Chevy 427 that can easily push the engine over 500 horsepower for a relatively low price. No 1966 L72's were ever built with automatic transmissions. Proudly created with Installation Kit included for ease of installation. Chevrolet had both big block and small block engines under their flagship. This casting was also shared with the 427/390HP L36 engine, but the L72 had 4 bolt main bearing caps and a larger oil pressure fitting port than the L36 (On the driver's side of the block above the oil filter). The L88 engine is one of the most popular big-block engines in Chevrolet’s history. Unfortunately,  of these cars had their engines "donated" to other performance car projects over the years so it is very hard to find a "numbers matching, original engine" L72 Chevy. Chevy 427 Horsepower Specs Early 427. GM 7.0L-427ci-V8 Engine Torque Specs. So how can you tell if you have one of the 1856 Full-Size Chevrolets built with the L72 engine ? The 1966 Chevrolet 427/425HP "L72" Engine. The only axle ratio available for the M20 Wide Ratio transmission in 1966 was the 3.31. The Chevrolet 427-cubic-inch, V8 engine debuted in limited numbers in 1963, but it wasn't mass-produced until 1966.

454ci: Chevrolet added the 454 in 1970, with the same bore but slightly more stroke than the 427 at 4 inches.

The W-series was produced from 1958 to 1965, and had three displacement options: ENGINE SPECS, RPO CODES, HP, TORQUE, BORED OVER DISPLACEMENTS TOO ... GM Light Duty Truck Service Manuals cover the following models: C/10, C/20, C/30, K/10, K/20, K/30, P/10, P/20, P/30. Chevrolet Performance resurrected the 427 Rat from the grave, and packed in some modern goodies. Therefore, the engine is also known as the Z11 427. One was the low-compression (10.25:1 compression ratio) four-barrel carburetor generating 390 horsepower and 470 pound-feet of torque. The Chevy 427 V8 was produced officially for the masses beginning in 1966. Even though it was the top engine in the Chevrolet line-up, only 1856 L72 full-size cars were produced out of a total of 1,499,878 units built for the 1966 Model Year (0.0012%).

© Detroit Automotive Restoration, 2018. From 1972 till 1975, the only version of the 427 available was the truck version used in Chevrolet Kodiak. Once tuned right, the 427 ZL1 was good for over 500 horsepower and was used in many famous race cars such as the McLaren and Chaparral. Chevrolet produced several different series of 427s that would go down in history as some of the most powerful engines of the time. The reason for that was, if the buyer wanted an axle ratio higher than the standard 3.31, Chevrolet forced you into the M21 transmission (For example, if you wanted say a 4.10 rear axle, you had to upgrade to the M21). All 427s featured a 4.25-inch cylinder bore and 3.76-inch stroke.By 1967, Chevrolet offered horsepower ratings of 385 and 400 on two 427s, with the torque rating for both at 460 pound-feet. Chevrolet used performance 427s in Corvettes and Camaros, and it used lower horsepower versions in family station wagons.Chevy's first 427 generated 430 horsepower, but it often was tuned to produce 500 horsepower. The 425-horsepower 427 remained untouched. (C= 2wd pickups, cab n' chassis, and Blazer / Suburban, K= 4wd pickups, cab n' chassis, and Blazer / Suburban, and the P model line is Chevy Vans. The other featured a four-barrel carburetor and a 11:1 compression ratio that produced 425 horsepower and 460 pound-feet of torque. performance for Chevrolet in 1966.

However, Chevrolet introduced its L71 427 with three two-barrel carburetors to generate 435 horsepower and 460 pound-feet of torque.The Yenko 427 was a dealer-installed 427-cubic-inch V8 developed by Don Yenko Chevrolet and placed in Camaros, Chevelles and Novas.

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