The cylinder heads (or cylinder addresses) can warp a bit after a while. The milling process shaves off a skinny layer of metal with Every pass. Immediately after enough passes, the cylinder head surface area is going to be beautifully flat which ensures the cylinder head gasket seals totally. They https://devinhaskc.blogdiloz.com/28130398/indicators-on-discounted-outboard-motors-for-sale-you-should-know