Flathead Ford Pistons Mercury Ford Flathead Ross Pistons

Ross Ford and Mercury Flathead pistons are faithful reproductions of Art Sparks' original forged flathead Ford piston design. Machined on special ROSS flat head forgings for maximum strength and minimum weight. Ross Ford flathead and Mercury flathead pistons are balanced to plus or minus 2.5 grams throughout the set. You can buy replacement pistons one at a time as needed. The skirt design allows the pistons to work properly under intense heat and tremendous side loads without scuffing or splitting cylinder walls. Most normally aspirated pistons are designed to operate at .004 piston skirt to cylinder wall clearance.

Flathead pistons are available for Ford and Mercury stroke crankshafts as well as stroker flat head crankshafts. All pistons in this section include aircraft quality pins weighing 120 grams which are retained by spirolox. All stocking flathead pistons are machined for 3/32, 3/32, 5/32 (stock size) rings except those noted below as using 1.5mm, 1.5mm, 3mm grooves. Top ring land is .280 wide to accommodate relieved blocks. Genuine GRANT rings included in price of pistons with 3/32 3/32 5/32 ring grooves. Pistons noted with a * in the bore column use millimeter size ring grooves and come with a Ross ductile moly top file fit, ring set. Dome height on all pistons listed below is .187", and they all use a piston pin of .750" diameter and are for use with a 7.000" rod length.

These Ross pistons can be used in forced induction engines using up to 5 psi boot or with nitrous systems of up to 250hp. The top ring land is .280" wide to accommodate relieved engine blocks.

The flathead Ford and Mercury engines are making a big comeback and are very popular now in hot rods, street rods and nostalgia drag cars. Start your flathead V8 engine rebuild off right with a set of Ross flathead pistons and piston rings. See the chart below for the wide range of available bore sizes, strokes, and piston ring types. They are available for standard stroke crankshafts, as well as stroker flathead engines. The flathead stroker pistons are available in several sizes. Why spend as much, or more, for antiquated stock type cast replacement pistons, when you can enjoy the numerous advantages of a modern high quality Ross forged piston set in your engine?

If you do not see the flathead Ford V8 engine pistons with the specs you need below, please visit our custom piston page and we will be glad to assist you with a custom set of pistons for your flat head project.

Click on the part number in the table below for pricing or to order. You may also click the home button in the top right border to go to our home page. From there you can access our entire website. Search by part description or part number, browse through parts for your specific vehicle make, see news and special sale info and much more!

Ross Flathead Ford and Mercury Flathead Piston Sets
	Make	Bore	Stroke	Grams	C.H.
ros 80563	Ford	3.312	3.750	315	1.561
ros 80564	Merc	3.312	4.000	314	1.436
ros 99817	Merc	3.312 *	4.000	323	1.436
ros 80572	Merc	3.312	4.125	312	1.374
ros 99818	Merc	3.312*	4.125	313	1.374
ros 80573	Ford	3.342	3.750	328	1.561
ros 80567	Merc	3.342	4.000	327	1.436
ros 80568	Merc	3.342	4.125	329	1.374
ros 80569	Ford	3.375	3.750	345	1.561
ros 80570	Merc	3.375	4.000	345	1.436
ros 99819	Merc	3.375*	4.000	359	1.436
ros 80571	Merc	3.375	4.125	347	1.374

* this set uses millimeter size ring grooves and comes with a Ross ductile moly top file fit, ring set

Ross Flathead Ford Pistons Mercury Flathead V8 Engine Pistons