The art of porting cylinder heads, whether by hand or by CNC machine, is a valuable part of blueprinting detailed engine builds or overhauls, and surprisingly subtle changes can determine how efficiently the engine will breathe.
Dave Martin makes the case for the FAA revisiting its policy on residential airparks so that they can remain a vital home location and useful national resource.
In his continuing series, author Bob Fritz discusses the ins and outs of threads including how to avoid seizing, types of threads, sizing, drilling holes, using a tap-drill chart, and matching fastener dimensions.