KB Hypereutectic Flat Top Piston Set - SB Ford 289-351W - Bore Size: 4.030", Stroke: 3.400", Rod Length: 5.400" Helmet Skirt 15 and 20 feet

15 and 20 feet

172 in Thick

1967-1973 GMC K25/K2500 PickupFor use on GM Powerglide automatic transmissions

Evacuation hoses not included

KB Hypereutectic Flat Top Piston Set - SB Ford 289-351W - Bore Size: 4.030", Stroke: 3.400", Rod Length: 5.400" Helmet Skirt 15 and 20 feetKeith 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 combustion chambers, 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