The Ford Y-block V8 replaced the old flathead in 1954 and grew through six versions in four model years. Each new size went into a specific Ford, Mercury or Thunderbird. Here is every displacement in order, with the car that got it and what that car’s records say.

One note before the list. Lincoln also built a V8 that people call a Y-block, but it was a different engine. Only Ford’s version appears below.

1. 239-cubic-inch Ford Y-block V8: 1954 Ford Crestline

By the early 1950s, Ford’s flathead V8 was out of date. So for 1954, Ford replaced it with an overhead-valve V8 of 239 cubic inches. That engine went into the regular Ford line, including the Crestline.

RM Sotheby’s describes a restored 1954 Crestline as having “a new high compression Y-block V-8.” Its lot listing rates the 239 at 130 horsepower, with an automatic transmission. That Crestline sold for $20,350 at RM’s Auburn Fall 2015 sale. Meanwhile, EngineLabs confirms that the 239 was the first size, introduced for 1954.

2. 256 cubic inches: 1954 Mercury Monterey

Mercury got its own size in the same first year. According to EngineLabs, the Mercury engine displaced 256 cubic inches and made 161 horsepower and 238 pound-feet of torque. In other words, Mercury buyers got a bigger engine than Ford buyers from day one.

RM Sotheby’s lists the same 161 bhp for a 1954 Mercury Monterey convertible. It calls the engine “a new Y-block overhead-valve V-8, based on the Ford design but larger and with a standard four-barrel carburetor.” That car also had a three-speed Merc-O-Matic automatic. Later, it sold for $49,500 at RM’s Don Davis Collection sale in Fort Worth, Texas.

3. 272 cubic inches: 1955 Ford Fairlane

For 1955, Ford stretched its own Y-block to 272 cubic inches. EngineLabs puts its output at 162 horsepower and 258 pound-feet of torque. That made the 1955 Ford V8 almost exactly as strong as the 1954 Mercury.

The Fairlane was one of the 1955 Fords that used it. An RM Sotheby’s 1955 Ford Fairlane carried the 162-hp, 272-cubic-inch V8 with a manual transmission. However, that car did not sell at Auburn Fall 2017. Its estimate was $42,000 to $48,000 for a car dressed with a Continental kit and fender skirts.

4. 292 cubic inches: 1955 Ford Thunderbird

The new 1955 Thunderbird got the biggest Y-block of that year. EngineLabs says the 292 “gave Thunderbird and Mercury drivers 193 horsepower and 280 pound-feet.” So the same engine served Ford’s new Thunderbird and Mercury’s line at once.

Likewise, RM Sotheby’s lists 193 horsepower and 292 cubic inches for a 1955 Ford Thunderbird with a manual transmission. The listing also notes it was one of 16,155 Thunderbirds produced for 1955, the model’s first year. That Torch Red car sold for $21,450 at Auburn Fall 2020.

5. 312 cubic inches: 1956 Ford Thunderbird

The largest displacement arrived for 1956. EngineLabs says the 312 “variously made 210, 215, 225, 235, or 245 horsepower depending on the model year.” In fact, that spread shows how many tunes Ford ran over two seasons.

For the 1956 Thunderbird, however, RM Sotheby’s gives specific numbers. Its 1956 Thunderbird listing says the twin-four-barrel 312 made 215 horsepower with a manual and 225 with the Ford-O-Matic automatic. Ford built 15,631 Thunderbirds for 1956, the listing adds. That Silver Grey car sold for $85,120 at Amelia Island in 2023.

6. Supercharged 312: 1957 Ford Thunderbird F-code

Finally, the last and strongest Y-block added a blower. EngineLabs says Ford fitted a Paxton supercharger to the 312 for 1957, for at least 300 horsepower and 300 pound-feet. After that, Ford moved on. It introduced the FE big block on larger cars in 1958, and the Windsor small block replaced the Y-block in 1962.

RM Sotheby’s describes the 1957 F-code Thunderbird as a “Thunderbird Special 312” with a McCulloch/Paxton VR57 centrifugal supercharger. It lists a factory rating of 300 horsepower. While Ford built 21,380 Thunderbirds in 1957, only about 200 got the F-code engine package, RM says. That Raven Black example sold for $224,000 at Amelia Island in 2023.

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This article was created with the help of AI and was reviewed and edited by Fast Lane Only editors before publication.