DIY Porting & Polishing
Cylinder mind porting is akin to rebuilding an automatic transmission, since it is seen as something of a coal Craft amongst Car enthusiasts. Those who don't discern it are afraid to jab, and those who are capital at it recurrently espouse the conception that porting requires super-human levels of capacity. On the other hand the actuality is that gaining airflow and horsepower by grinding on metal is attainable by anyone who has a modicum of dexterity.
Buy the Tools
The antecedent and maybe most determining method in porting is having the Correct tools. Many wrongdoing air and electric-power die grinders for their smaller cousin, the Dremel RotoTool. Though a Dremel Testament eventually disburse to grind elsewhere some metal, you're going to itch the influence if by a die grinder. Pay for a ready-made porting equipment from a manufacturer cognate Guideline Abrasives; these kits come with every metal machining bit, grinding stone, cartridge (sandpaper) roll and mandrel (margin) that you'll committal for the gig.
Gasket Matching
The mis-matched mating surfaces between cylinder purpose and intake manifold are a vast disruption to flow and are nearly certainly costing you at least Ten horsepower. First off, deposit an exhausted intake manifold gasket on the sense's intake ports and hit it with a glowing coat of fast-drying caucasian spray colouring. When you ablaze the gasket absent, you'll look there is an area about 1/8 inch surrounding the intake port coated with paint. This is what you're going to remove.
Intake polishing isn't worth much horsepower and may actually cause a decrease in fuel atomization (mixing). Focus your efforts instead on the exhaust port; this area can't be too smooth or shiny. Start with a stone to receive it smooth and move to progressively finer grits and compounds to shine it up. Follow these steps, and you're looking at about Thirty horsepower on a 350+ cubic-inch engine, perhaps Twenty on a 302. Four cylinders will gain about Ten to 15.
Use a metal carbide bit to remove the material, tapering off until you get a smooth transition to about One inch inside the port. Smooth the area with a cartridge roll.
