The bowl area, and especially the short turn radius on the port floor, are also critical to airflow in most cylinder heads. Afr has a wide range of parts to help with everything from initial installation to refreshing your cylinder heads. Cylinder heads, ported heads, milled, afr, vinci, cnc. The port is them run through preliminary tests on a. Performance cnc 5axis cnc porting, custom machining.
Unfollow afr cylinder heads to stop getting updates on your ebay feed. Available in runner volumes from 210cc, 215cc, 230cc and 245cc. These afr 377cc heads feature 100% cnc ported intake, inconel exhaust valves. One of the heads was drilled for a 12 inch stud the other a 716. Thought, i can deal with this bought arp head bolt retainer washers from. Afr 165cc sbf renegade 20 degree street heads 99 free. Afr s 260cc ls3 mongoose heads feature 100% cnc ported intake, exhaust and chambers using our advanced engineering and flow techniques to produce the ultimate rectangle port head available today. It takes a craftsmans touch to shape the surfaces of the head for the optimal flow characteristics and the best performance. Increase airflow through the heads and into the combustion chamber and youve got the potential to make more power, since more air in means more power out. This is one of many books that i bought inorder to get a better view of cylinder head porting. But the majority of these shops only offer a couple of aspects of the entire process, and. This book taps into some of the best smallblock chevy cylinder head resources this country has to offer with a combination of insight and best estimates, because much of what we know about port design and airflow management falls under the category of art rather than science. Featuring a356 aluminum castings, titanium retainers and the highest quality components, throughout.
Cylinder head services livernois offers something that most of our competition just cant match, complete in house cylinder head development from start to finish. Unless you have a separate room to keep aluminum shavings and iron. Air flow research high performance cylinder head specialists. Basic porting techniques for chevy smallblock cylinder heads. Sac engineering successfully gas flowed more than 20 000 cylinder heads over the past 33 years and have built at least 2000 very special raceready cylinder heads. This is the moved centerline head for bigger valve setups and max performance. Afr has, over the years, pioneered many aspects of cylinder head design and development that we tend to take for granted these days. Cylinderhead porting can be accomplished at home with some studying. Todays aftermarket cylinder heads come with a high price tag. For aluminum, the tooth form needs to be coarser to minimize. We are undoubtedly south africas leading cylinder head specialist one stop shop and are capable of preparing very hightech quality heads. Few other engine builders have the same level of knowledge and skill porting engine heads as david vizard.
One of the easiest ways to gain 20 to 30 horsepower is to purchase ported and polished aftermarket cylinder heads. Our magnum line of cylinder heads for the big block chevy are available in oval port designs with runner volumes of 265cc, 290cc, and 300cc or rectangular ports with 305cc, 315cc, 325cc, 335cc, 345cc, 357cc, 377cc and 385cc runners. Some afr history explains the motivation to create this new cylinder head and intake combination. To get the edge on the competition, you cant buy a cncd head out of a catalog. Its also important to note that the test on this head represents the full cnc competition porting effort available from afr, while most of the heads in this category are as cast. In 1970, ken sperling took ownership of air flow research known for their innovative porting techniques used throughout motorsports, tim torrecarion, director of marketing and sales explains. Airflow research afr provides the best bang for the buck performance cnc ported cylinder heads available today. The mustang ran in the mid9s with the ported engine i built for him. The five golden rules of porting cylinder heads part 7. In the aluminum category, afr has 265, 290, 300, and 305cc port heads. If you dont believe me, just search online for cylinderhead porting more harm than good and view the multiple pages of results. Dave and his team have amassed a huge amount of experience and expertise and are now creating some of the best performing cylinder head and cam. This head is ideal for street driven, naturally aspirated motors between 346ci.
Afrs new bigblock ford cylinder heads are tentatively scheduled to be on sale by the time your read this. Here is an area where there is a tremendous amount of potential for success and also failure. Porting demands the right tools, skills, and application of knowledge. Air flow research puts a new angle on their new big block. All heads are made with a356 aluminum and are equipped with high quality components throughout.
All the aspects of porting stock as well as aftermarket heads in aluminum and. Afr has, over the years, pioneered many aspects of cylinder head. We have heads for the average bracket racer to the all out competion engine. Airflow research afr cylinder heads free shipping on. A head can be engineered for maximum power, or for minimum fuel usage and. Throughout this book, i perform a basic porting job to the heads, which. Cylinder heads air flow research cylinder heads afr. If you are new to gen iiis, please note that these heads are aluminum and unless otherwise noted, so is every other head in this book. Buy afr is the best at one thing connecting our customers with afr cylinder heads. At the end of the day, pocket porting may not produce the fastestlooking set of heads or the most photogenic, but the results can be very satisfying.
Section b, the turn into the seat area, flows some 200 cfm. Unlike some aftermarket heads, afrs ford cylinder heads carb e. To alleviate some of the financial pressure, you can send your cylinder head to a machine shop for the porting. As an early producer of cncstyle ported heads in the mid 1970s with tapecontrolled machines this company has experienced much change. All the aspects of porting stock and aftermarket heads in aluminum and cast iron are covered. Afr mongoose head offer unmatched flow rate of 300cfm at. Dart 127121 shp cylinder head for small block chevy. Once the first batch of production heads have been cast, stay tuned to car craft for an. Component upgrades and different machining options are available to customize. For the ultimate small block ford street car, consider afr 165cc sbf renegade 20 degree street heads. This head design is amazing i believe it outperforms the 200 shp as this is darts old design. Afr 195 sbf renegade nonemission cylinder heads 72cc.
To better understand how air flows through a head on its way to the combustion camber, lets take a look at the anatomy of a. Cylinder head porting operates under a pretty simple premise. Thats because as this book is written, afr has just completed work on a revised eliminator version. The first step is to use the traditional method of hand porting using grinding tools and our past experience and knowledge for shape and sizing. Cylinder heads, race porting, aluminum, assembled, 58cc chamber, 205cc intake, ford, small block, pair. The company was largely successful in doing this, and the result is that smallblock ford and chevy heads are coarsestep cnc ported. In this groundbreaking book, porting master and engine building wizard david. Nhra legends bill grumpy jenkins and warren johnson both got their power from afr aluminum heads. The most cost effective streetstrip head available afrs 280cc aluminum cylinder heads have 2. The engine will love the upgrade but your wallet may not.
Ultimate ls cathedral port cylinder heads guide ls engine diy. Guide to chevy smallblock largeport heads 200cc and. It all started with afrs original 205cc mongose ls1. Dave localio is a longtime friend of ours and the owneroperator of headgames motorworks, a cylinder head specialist founded in new jersey in 2001. Afr heads entire sbf line is cnc ported from afr to produce the highest flowing, highest velocity cylinder heads on the market today. Cylinder heads, as manufactured, are usually suboptimal for racing applications due to design and are made for maximum durability hence the thickness of the walls. Afr is proud to announce their new bbc marine cylinder head.
In stock discount afr cylinder heads at ad performance. How to port aftermarket cylinder heads part 5 muscle car diy. In the 1980s afr loaned its services to gm and nascar, pioneering the use of wet flow. Afr is a staple in the aftermarket cylinder head market, beginning in the 1970s and pioneering cnc porting with its revolutionary tapefed cnc machine. We are stocking distributors for the industries best cylinder head manufactures. Whether you have been porting your own cylinder heads for years. When it comes to amateur porting, smokey yunick put it best in one of his books. I think it is a bad investment to spend a lot of money on porting cylinder heads for. Afr 190cc sbc street cylinder head the small port, high velocity torque monster. While our 195cc, 205cc and 220cc heads are designed for aggressive. Airflow research afr 1450 afr 205cc sbf renegade race heads. Cylinder head porting has been an overused term for the last 20 years, and despite all the words written about this process, you cant go more than 10 minutes with any group of hot rodders before someone uses the term port and polished, which merely reveals their ignorance on the subject.
Our renegade line of cylinder heads for the small block ford, feature 100% 5axis cnc ported intake, exhaust and combustion chambers. Component upgrades and different machining options are available to. We take a very serious and methodical approach to cylinder head porting. Using his experience and knowledge base, tony worked his porting magic on the eliminator heads to the tune of an extra 23 cfm, upping the. Cylinderhead porting basics for the home enthusiast. Cylinder head options for building biginch ls engines. Preplanning reiterating, the internet is a valuable tool for the novice. For the record, pocket porting heads reworking and blending the seats into the first 2 or so inches of the port is all about focusing on rule number1, to the exclusion of almost all else. Check out what goes in to a cylinder head with afr cylinder heads tony mamo, featured in the 2008 february issue of chevy high performance magazine. David vizards how to port and flow test cylinder heads. There are a lot of shops that offering porting, or cnc porting, or cylinder head machining.
All the aspects of porting stock as well as aftermarket. If you dont believe me, just search online for cylinder head porting more harm than good and view the multiple pages of results. Afr pioneered cnc cylinder head porting and was the first company to offer a full line of economically priced cnc ported cylinder heads to the aftermarket. Afrs superior castings, superior performance, superior parts and superior products have put it as the leader in aftermarket cylinder heads. Cylinder head porting refers to the process of modifying the intake and exhaust ports of an internal combustion engine to improve quantity of the air flow. This is a highly flow efficient, rectangular crosssection straight tube and flows 300 cfm. This head has proven a 70 cfm increase in flow over a stock cylinder head.
In fact, on the honda dseries, bseries and kseries cylinder heads i have had ported and flowbench tested, as much as 3040% of the improvement to airflow has come from work done in the bowl area. Afr s, mongoose, ls1 cathedral port cylinder heads are 100% 5axis cnc ported and made with a356 aluminum. Unfollow afr heads chevy to stop getting updates on your ebay feed. Apart from being extremely functional, afr produces a highquality. Having the right cylinder heads is as crucial for consistency as using the right converter and carburetor. 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 ascast heads. If youre a headsup racer, you need an engine thats sharp when it comes off the throttle stop.
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