Author: David Vizard

A new way of spec’ing Cams: Speed Spec.

A revolutionary, fast and hyper accurate way of spec’ing and selecting catalog cams; A system that finally eliminates the fog of cam selection. The revolutionary (and I seriously mean revolutionary) cam spec’ing technique that I am about to show you is at least 12 years late in arriving at the desks of pro and pro class enthusiast engine builders desks. All because somebody said “we have some clever guys working for us you know”. Here in simple terms is what it delivers: Speed Selection – 15 second cam selection. Speed Timing – dramatically more precise valve events. “Speed Spec”...

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Dyno’s Don’t Lie. But misinterpret the results and they may as well lie.

This article was prompted by my coming across yet another number of web site postings concerning the controversial subject of lift flow. It is commonly accepted among many successful two valve competition engine builders that too much low lift flow hurts power. Although commonly accepted by many that is not to say it is a correct assumption. Those engine builders that claim too much low lift flow hurts power are basing their conclusions on what seems to be irrefutable evidence supporting such a claim – namely back to back dyno tests. If this is so the case for seeing...

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