Internal combustion engines are sophisticated air pumps that pull in an air/fuel mixture, compress it, ignite it, react to the ignition and expel the exhaust fumes. The better an engine pumps air, the more efficiently it will operate. This is one reason why we've seen a turn to multi-valve engines in recent years. More valves means more air moving through the engine. More air means greater engine efficiency – both more power and better fuel economy.
When you "port" an engine, you remove imperfections and restrictions between the combustion chamber and intake manifold and, therefore, increase air flow. This is done by 1) "smoothing" (or, grinding) the passages in the intake manifold so that they are the same size as the gasket and cylinder head, and 2) removing "rough cast" or "flash" imperfections in the cylinder heads and exhaust manifolds.
For best results use a high-speed grinder. To remove more aggressively, use carbide burrs.
Forty 80-grit Abrasive Rolls (20 tapered and 20 cylindrical)
4 Mandrels (2 each: 4" and 6" lengths)
Download product instructions PDF
Cylinder Head Porting Kit - How To Operate & Safety Instructions