Manley piston rings are to suit the 5.4 lt engine. This ring set is to suit the manley Forged Pistons for the 5.4 lt Boss engine. The rings are available in std, .020 and .030 th and both ductile iron and premium steel.

So why two types of piston rings, Ductile Iron and the Premium steel.

As a basic guide the premium steel ring is twice as strong as the ductile iron ring set. Using a ductile iron ring set in a naturally aspirated engine will work well and should see reasonably quick bed in times. The premium steel ring set would be better used in a turbo or supercharged 5.4 lt application, The premium steel ring set is twice as strong as the ductile iron therefore it will take much more cylinder pressure and be resilient to the extremes seen in a turbo or supercharged application.

Both manley ring sets are file fit applications with minimal blow-by and increased horsepower while cooler, cleaner oil resulting in longer engine life

The Ductile Iron top ring has a plasma moly in-lay

The Premium Steel top ring has a Chrome Nitride face coating.

Pics are for illustration only. 00042284/00052363

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