Ford Flathead V8 Specifications

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The Flathead V8 engines produced by Ford Motor Company (USA) included basically three versions. The most popular being the 85-125hp that was first produced in 1932, and continued until 1953 (except for Canadian and Australian production which ended in 1954). Ford also designed and produced a smaller 60hp flathead V8 engine from 1937 until 1940. Lastly, the big 337 cubic inch flathead V8 engine, which was produced mainly for truck use and for Lincoln cars from 1948 to 1951. Ford's flathead V8 engines when introduced in 1932 were the first mass-production V8's where the block and cylinder assembly were poured as one single casting.

Click on the links below for general descriptions, general specifications, and tune-up specifications on each series engine. Horsepower and torque curves are available on some model years.

  60 hp V8 
(136 cubic inch)

All Years 17 Stud V8

 85 - 125 hp V8 
(221 to 255 cubic inch)

Early Years 21 Stud V8 (1932-38)

Middle Years 24 Stud V8 (1938-48)

Latter Years 24 Stud V8 (1949-53)

 125-154 hp V8 
(337 cubic inch)

Big Lincoln/Truck V8


There are many specifications for these engines, and many changes over the years by Ford. The information listed herein is correct to the best of our knowledge, but may contain some inaccuracies. It is our intention to make this website as factually correct as possible. If you have any documented specifications or other data that contradicts or adds to the information on these pages, we will gladly consider your new specs or corrections for the site. Please use the CONTACT US page to get your comments to us so that we can verify any new information. Changes or corrections will not be added unless they can be verified and documented. Thank you.

What Is My Displacement?

The following table shows the common flathead V8 bore and stroke combinations and the overall engine displacement (in cubic inches). The blue numbers in bold print reflect the standard displacements used by Ford on their flathead V8's over the years of the 85 to 125hp engines. If you have had the engine bored out beyond one of the standard bores shown, use the following formula to calculate the displacement.

Bore (in inches) Stroke (in inches)
(in fractions) (in decimals) 3.750 (3-3/4)" 4.000 (4)" 4.125 (4-1/8)"
3-1/16" 3.0625" 221 235


3-3/16" 3.1875" 239 255


3-5/16" 3.3125" 258 274 284
3-3/8"    3.3750" 268 286 296

Formula: Pi (3.1416) times (radius is 1/2 the actual bore size) times stroke (see chart above) times 8 cylinders

Example: Your stock 1947 V8 came with a 3-3/16" bore and 3-3/4" stroke, but you had it bored out thirty thousandths (.030").   Adjust the bore size (3.1875" + 0.030" = 3.2175") for the oversize.   The new cylinder diameter is now 3.2175".   Radius of the cylinder is one half the bore (3.2175 divided by 2) or 1.60875".   Now, square that number (1.60875 x 1.60875) to get 2.58808". 

We'll use the formula to calculate the displacement:     Pi (3.1416) times (2.58808") times stroke (3.75") times 8 cylinders. Using your handy dandy calculator, you should come up with 243.9 cubic inches.


What Are the Standard Engine Bearing Sizes?

Click HERE for the complete chart of standard bearing specification on flathead V8 main and connecting rod bearing journals.


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