Flathead Ford Performance
The Ford flathead V8 is often given credit for the birth of the speed-equipment industry. Beginning in the 1930s, companies such as Offenhauser, Edelbrock, Speedway, Navarro Racing Equipment, and others began making performance parts for the flatty. Today, everything from bare blocks to exotic induction systems are offered from scores of suppliers.
This is generally where upgrading the flathead begins. Aftermarket intake manifold choices include a single four-barrel, two single-barrels, and three one-barrels. The most common carburetors seen on the flathead are the Holley 94 and the Stromberg 97. Although the 94 has a slightly better flow rate, twin Stromberg 97s are the most popular choice among traditionalists.
Edelbrock makes their own "94" carburetor, which has a die-cast bowl and air horn and aluminum 3-bolt base. A secondary version of this carb, without the choke, is needed for multi carb setups. Both versions have extended throttle shafts for easy installation when used in dual and triple carb combos. A "new" Stromberg 97 carb is produced by H&H.
Carburetors generally work best when located directly over the intake ports. On the flathead, the ideal position for twin carbs would be one centered over the front four cylinders, and one over the back four cylinders, but then the generator does not fit in the stock location. This is solved by changing the mounting brackets to move the generator off to one side. Some older-style manifolds (like Offenhauser) have the carbs close together, leaving enough space for the generator.
Find Flathead Performance Parts At Mac's Auto Parts
A common flathead malady is spark plug fouling. This is often due to the carburetors getting too much fuel pressure. They only need two pounds to operate, any more than that and you'll be blowing the seats out and leaking gas. A fuel pressure regulator is a must for multi-carb setups. A fuel pressure gauge is always a nice touch.
Edelbrock Slingshot Manifold
Multiple carbs not only provide more performance, but look great. The Slingshot Manifold, originally designed by Vic Edelbrock Sr. in 1938, is currently being reproduced by Edelbrock. Great looks and good power make the Slingshot a good choice for a street rod, and can be used with the generator in it's stock location.
Three Deuce Manifold
Improved power can be seen with a tri-carb setup, but a stock 239ci flathead will have a hard time handling three carbs. A 258ci engine (3-5/16" bore and 3-3/4" stroke) with a mild cam would be a good platform for this. Running a tri-carb on the street will also require a progressive throttle linkage.
Flathead Ford Camshafts
Isky, Schneider, and Elgin have been making flathead cams for decades. Newer non-traditional grinds would be best for today's hot rods and street rods.
Flathead Ford Distributor Conversion
The addition of multiple carbs and more radical camshafts require a good spark curve, and the addition of a centrifugal advance is a welcome addition to any 8BA flathead. One option is to cut-down a SBC Chevy distributor to fit the flathead and have it re-curved, or you buy one already converted.
Several internet sources offer upgraded distributors to fit Ford flatheads. One such outfit is Bubba's Hot Rod Shop. Any of their flathead distributors will improve driveability and gas mileage. Some feature a mechanical tach-drive, which allow running an old school tach.
Ford Flathead Valve Covers
Edelbrock, Offenhauser, and Baron offer both reproduction heads as well as new, improved versions. Nothing is more nostalgic than a pair of finned valve covers on a flathead V8.
Finned Valve Covers
These Edelbrock #1115 valve covers are made of A356 aluminum and have a natural finish. Improvements over stock heads include larger water capacity and better breathing characteristics. With a 3/16" base relief, standard compression ratio will be increased to 8.0:1.
Shop: Edelbrock Cylinder Heads (pair)
Flathead V8 Headers
Installing headers will give any engine an immediate gain in horsepower. Replacing the stock exhaust manifolds is any easy way to higher performance. Not only is back pressure reduced, the exhaust tone is sweet.
Shop: Flathead Ford Exhaust Headers
Made of high quality T304 stainless steel, these center-dump exhaust headers are made by Bestauto and will fit 1932-1953 Ford Flathead V8 engines.
4" Mercury Crankshaft
Produced from 1932 to 1953, the Ford Flathead V8 was offered in several displacements, but the block remained the pretty much the same. In 1949, Ford came out with a larger 255ci flathead for their new line of Mercury cars. The bore was the same as the 239ci (3-3/16") engine, but a new crankshaft gave a four-inch stroke. For early hot-rodders, the 1/8" larger crankshaft became the crank to have. It dropped right into the smaller and earlier engines, thus 'stroking' the earlier blocks to 255ci. Companies such as Scat sell cranks with up to a 4.5" stroke and also offer new H-beam connecting rods. Arias, Egge, Ross, Wiseco, and others custom-make pistons to your requirements.
Trans-Dapt still makes adapters to install Ford passenger-car transmissions from the mid '60s to the late '70s behind the '49-'53 flatties (provided you have an original bell housing). Flat-O Products sells well-designed, complete kits to install the Ford C4 automatic and T5 manual behind either 8BA or 59A flathead engines. Centerforce offers clutches and flywheels.
New Flathead Blocks
When production ceased in the United States in 1953, the Ford flathead V8 continued to be made in France for use in their military vehicles. French blocks, cranks, cams, and rods were produced into the 1980s.
read: Flathead Ford History
New Ford Flathead repair manual covers disassembly, inspection and repair, assembly of engine and tolerances. Contains info for 221ci and 239ci Flathead V-8 Engines (78-81A-59A Series).