Diamond Pro Select Piston Rings

The Diamond 4.6/5.4 Pro Select Piston Rings are an excellent choice for all 4.6/ 5.4 Pistons with a 1.5mm, 1.5mm, 3mm Ring Pack. These Rings are available with a Plasma Moly Top Ring, and a Coated Stainless Top Ring. We suggest the Stainless Top Rings for 4.6/5.4 Engines with more than 150HP Shot of Nitrous, or more than 20lbs of Boost.