Porting cylinder heads
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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. | 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 | + | [[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"/> |
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