Porting heads is an art and science. It takes a craftsmans touch to shape the surfaces of the head for the optimal flow characteristics and the best performance. Porting demands the right tools skills and application of knowledge. Few other engine builders have the same level of knowledge and skill porting engine heads as David Vizard. All the aspects of porting stock as well as aftermarket heads in aluminum and castiron constructions are covered. Vizard goes into great depth and detail on port