Harry took pride in helping a fledgling industry get its start on the dry lake beds of California, where time trials preceded the sport known as drag racing. He experimented with cams to improve the performance of Ford flathead V8s and inline sixes, producing the reground race versions of cams to the eager hot rodders of the era. Weber Speed Equipment grew from cams to include parts such as clutches and flywheels. He is noted as one of the original supporters of the idea of forming an organization called SEMA.