- ALUMINUM HEAD PORTING KIT HOW TO
- ALUMINUM HEAD PORTING KIT DRIVER
- ALUMINUM HEAD PORTING KIT PRO
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This street driver used a Comp Cams 280 street roller to get these results. As these figures show, the “as cast” 325-cc port AFR put on a good show. They produce excellent results right out of the box and leave little on the table for the home porter to do.įig. The company was largely successful in doing this, and the result is that small-block Ford and Chevy heads are coarse-step CNC ported. When net porting was in its early days, AFR looked at ways to speed up CNC porting, so it could offer such heads for little more money than as-cast heads. AFR has, over the years, pioneered many aspects of cylinder head design and development that we tend to take for granted these days.Īs an early producer of CNC-style ported heads (in the mid 1970s with tape-controlled machines) this company has experienced much change. Among the earliest of companies outside of General Motors to produce aluminum heads, this is a brand that I have had a very long association with. It has been used by many of NASCAR’s top teams. Air Flow ResearchĪir Flow Research (AFR) is a company that has been around since the early 1970s. Now that you know your role as a porter, let’s look at the heads that are included in this easy porting scenario. From here on, finishing involves blending the cast finish with a 60or 80-grit abrasive cartridge roll. Throughout this book, I perform a basic porting job to the heads, which entails narrowing the guide bosses, blending the machined part of the short-side turn into the cast part around the main body of the port, and blending the bowls into the rest of the port and the bottom cuts of the valve seats. Indeed, after being home ported, most of these heads can produce results close to or about as good as their much-more-expensive CNC equivalents. TFS took a very mediocre factory design and, with some innovative thinking, turned it into an outstanding two valve cylinder head.Īll of the heads I discuss here work very well in the as-cast form, but about 12 to 30 hours of porting work (depending mostly on whether it’s a small or big-block) turns them into heads that, even as recently as the mid 1990s, are considered “race grade” hardware. I’m heading this chapter with the TFS head for the 4.6and 5.4-liter Ford Modular motors for one good reason. Even then, if you follow my porting recommendations, a flow bench really only determines if you have done a good job or a really good job.įig. For the most part, you do not even need a flow bench except to check your results. If you have average dexterity, a cheap die grinder, and a porting kit you are in business.
ALUMINUM HEAD PORTING KIT PRO
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ALUMINUM HEAD PORTING KIT FREE
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ALUMINUM HEAD PORTING KIT HOW TO
This Tech Tip is From the Full Book, DAVID VIZARD’S HOW TO PORT & FLOW TEST CYLINDER HEADS. All the castings I refer to are best described as having port and chamber forms nicely roughed out, requiring little more than a finishing job. In this chapter, I list manufacturers that produce easy to port head castings. This was the start of what can truly be described as the golden age of cylinder heads for the V-8 performance community and head porters alike. The result was head castings that had far more effective ports as received from the head manufacturer. In the late 1980s and early 1990s, production processes resulted in much more accurate castings.
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