Editing Porting cylinder heads (section)
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==Areas to work on== Proper porting procedures will result in getting the largest volume of air/fuel mix to the combustion chamber in the shortest amount of time. Porting works hand in hand with valve grinding and seat cutting. During the manufacturing and machining processes of a cylinder head, there are areas that are left unfinished. This is due to cost/time restraints imposed on the manufacturers. When a port is machined for a seat, often a lip is left below the seat. This lip is sometimes semi-removed using a type of tapered reamer that helps smooth the transition from the seat into the pocket portion of the port. But because this is done quickly and by machine and not carefully and by hand, there is still almost always places where improvements can be made. [[File:EXH PORT.jpg|thumb|400px|left| Arrows indicate lip left after the machining process. This needs to be carefully removed so the transition from the seat to the pocket is smooth.]] <br style="clear:both"/> Another example of areas that need attention. This is a BBC head that has had some work done to it already: [[File:049 bowls.jpg]] <br style="clear:both"/> ===Layout dyes=== [[File:DYKUM BLUE TUBE 001.jpg|thumb|100px|Dykum blue layout dye]] One common type of metal dye is machinist lay out paste, dykum blue, prussian blue, etc. Comes in a tube, is thick enough to be spread out with a piece of paper towel, etc. After it sets up for a few minutes, the scribing can be done. Another type comes as a liquid in an alchol base that can be sprayed or wiped on. When the alcohol evaporates, the dye is left behind for scribing. In a pinch a Sharpie/Magic Marker can be used.
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