KB Hypereutectic Flat Top Piston Set - SB Ford 289-351W - Bore Size: 4.040", Stroke: 2.870", Rod Length: 5.090" Firebottle Safety Systems They feature a wear resistant

They feature a wear resistant tool steel axle and precision sorted needle bearings

Plates fit against outside edges of tires

Cast of high silicon ductile iron to withstand extreme temperature cycling caused during DPF regeneration

Mechanical movements provide accuracy and durability even in the harshest environments

Stretchable Construction

KB Hypereutectic Flat Top Piston Set - SB Ford 289-351W - Bore Size: 4.040", Stroke: 2.870", Rod Length: 5.090" Firebottle Safety Systems They feature a wear resistantKeith Black pistons have several important advantages over conventional alloy pistons. High silicon content yields superior thermal and wear characteristics, greater strength, scuff and seizure protection, and resistance to cracking. High silicon content also keeps heat in the combustionchambers, eliminating heat transfer and improving combustion. Pistons are machined for 5 64" top, 5 64" second and 3 16" oil ring unless noted. Sold in sets of eight