99310511607  Now a permanent solution to leak-prone Porsche 993 factory plastic lower or upper valve covers. Over time, engine heat cycles cause the plastic valve covers to separate around the aluminum bolt sleeves causing an oil leak. Our replacement racing 993 lower or upper valve covers are precision-machined from aircraft-grade aluminum billet. These covers permanently correct the problem and help your engine run cooler by dissipating engine heat more efficiently due to their aluminum composition and finned surfaces. Available in anodized silver or black. Sold as a pair.