This 400M is a Real Torque Monster And Will Fit In Place Of Any 351M/400. Includes High Capacity Milidon Oil Pan, Upgraded Hyperuetectic Pistons, RV Cam, And Lots Of Other Upgrades.

Find FORD 6.6L/400 Pistons and get Free Shipping on Orders Over $99 at Summit Racing! JavaScript Disabled. ... Pistons, Cast, Dish, 4.030 in. Bore, Ford, Set of 8 I have the "rare" '71 Ford 400 (9.3:1 CR with factory open-chamber heads) that I'd like to do a little work on. The pistons, rings, cylinders, and bottom end will remain untouched since they're in really good shape. It is currently factory everything, including the intake. The carb was burned off in an engine compartment fire.