Sealed Power E-251K 20 Premium Piston Ring Set

Sealed Power E-251K 20 Premium Piston Ring Set

• Face of top rings coated with latest generation Plasma-Moly
• Decreases friction
• Very resistant to scuffing
• Exacting tolerances
• Meets or exceeds OEM specifications

Sealed Power Moly Ring set 4.020 BoreApplications.020 size for327 and 350to 1985 small block Chevyengines..020 Size for289 302and 351W Ford engines with the following ring grooves. Bore Size Ring Width 4.020 5/64 5/64 3/16 Also available in std, .030, 040 .060Quantity - 1 SetPart # E251K20Moly ring Set for common 350 chevy 4.02 bore, 302 Ford 4.020Bore, 351w, 351m, 400 Ford 4.020 bore... please check ring groove sizes below.Steel Compression Rings Replacing Cast Iron RingsFederal-Mogul is implementing a material change to Sealed Power top piston rings from grey cast iron with plasma/moly to carbon steel with plasma/moly on many of our popular ring sets. The advantages of the carbon steel include 35% more strength, 30% less weight due to smaller radial wall thickness and double the resistance to side wear, which is a common problem on late-model engines.Since the steel is 35% stronger than cast iron, the rings can achieve the same ring tension with 35% less weight. The weight savings is accomplished by reducing the radial wall thickness of the steel ring. The result is a ring that's lighter, with a higher effective RPM potential and stronger to survive the abuse of today's high output engines. The material change also allows the ring to seal better due to the reduced radial wall allowing it to conform to the cylinder wall better.