Head to head flow testing small block ford cylinder. Developed with the aid of advanced computer aided engineering simulation tools, the unique velocity vane intake port design improves power throughout the rpm range. Upgrading fox body mustangs to gt40 heads became a popular modification. I wanted the thermactor ports in because it cleans up the idle better by running air into the heads. Ford casting numbers are part numbers cast on either the top of the cylinder head, or on the bottom, which requires removing the cylinder head. Gt40 heads are a factory small block ford head found on a certain vehicles. Starting with the outboard side of the throat, as with the intake, the throat. Ford smallblock general data and specifications cartech books. Developing highly functional cylinder heads for performance. Ford gt40p heads with 4 bars on end good condition. On your 289 you will be giving up too much in the form of compression to get any benefit from the gt40gt40p.
C automotive also offers early 289, early 302, e7, and 351 w heads. The five day, nine hours per day, course teaches you the theories behind porting and shaping cylinder heads. The five golden rules of porting cylinder heads part 7. All 289 cylinder heads, including high performance, have the same port. An old hot rod buddy was looking for springs for his 5. Initially, my work was very conservative since i had read that its easy to mess up the p heads and actually lose cfms throughout the entire lift range. Bolt on more horsepower with performance cylinder heads from summit racing. The same can be said for the block and other info on that page. First, remove the valve cover from the top of the cylinder head using a 38drive ratchet and the appropriate socket. Cylinderhead porting basics for the home enthusiast. In fact, he has authored more than 30 highly respected engine building and automotive books, penned about 4,000 magazine articles, and contributed scores of web pieces to popular sites. The additional chamber volumn of these late model heads is about 64 cc 60cc were only one year of head the f3zz head from 93. To accomplish this i felt that i had to open up the exhaust port and do decent bowl work on both the intake and exhaust.
Special thanks to the vintage mustang forum group on fb. Ford hired roush industries to help out and rework the thencurrent 5. This is my first attempt to modify any cylinder heads. I used the frpp y heads for my personal comparison. Gt40 gt40p heads were a more free flowing cylinder head that outperformed the factory e7 heads. How to identify gt40 cast iron heads by floyd drake iii considered the best factoryproduction smallblock ford cylinder heads, according to reinholt racing, ford gt40 heads were first featured on 1993 to 1995 cobra mustangs. The gt40 p cylinder head is popular for classes that must run a stock ford production head. This intake has been welded in the corners to allow further porting.
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. Cylinder head and porting books page 2 don terrill. Its important, but is not actually the handson stuff. Stock engine hp gain with just ported heads and upgraded. The advance design era 19471955 has been overlooked for long enough and deve krehbiel, a wellknown restoration expert from who specializes in these trucks, puts his 40 years of experience restoring nothing but advance design trucks into a very extensive and very complete single volume with more than 500 photos and detailed instruction for every aspect of a proper restoration. 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. Below we will provide an easy guide to port and polish cylinder heads. Our sst porting is for applications where porting the head is allowed and, because of the application, the cylinder head just doesnt need to be fully 100% ported. When undercover ported, the gt40 head will flow 202. Dec 29, 2014 gt40 head porting if this is your first visit, be sure to check out the faq by clicking the link above. Head type, intake port, combustion chamber, intake valve, exhaust valve. My goal was to create a set of heads that flowed well for cheap. Xtremeamazing new intake exhaust engine porting tool cylinder head snowmobile carbide tungsten.
Stock air flow on this head tops out at 190 cfm intake and 128 cfm exhaust. Porting for late model twin cam heads up to year 2004 castings. Be careful, as most of the info is incorrect for casting numbers. Standard headers and intakes will fit fine, no smog ports on rear of heads. What is cylinder head porting, and how does it increase.
Ive got a set of ported gt40 heads off of a 93 cobra. This is done very cheap and easy with only a hand drill. The casting number, if located on top, is in the center of the gt40 head. Mar 21, 2016 compare the original heads, the original gaskets, and the gt40s. Performance cnc 5axis cnc ported racing cylinder heads. Performance cylinder heads enhance the airflow into your engine, giving you improved power and torque. Fords gt40 cylinder heads fox body mustang mods cj pony. If you dont believe me, just search online for cylinder head porting more harm than good and view the multiple pages of results. In this article well discuss the windsor cast iron cylinder heads, valve size and port shape, and how to improve the performance of these castings. They are brand new bare castings that have never been installed or assembled.
To identify your gt40 gt40 heads, look for a gt or gt40p stamp inside the heads or a three bar gt40 or 4 bar gt40p stamped on the side of the head. I was contemplating them for my 90 gt a few years ago, before deciding on the edelbrock performer heads. Due to space considerations, we didnt have room in the first story to detail all the tricks that went into these heads. This port is designed for baggers for everyday street ridingcruising, this port was not designed for drag racing. Cylinderhead porting can be accomplished at home with some. Cylinder head porting head porting basics get more power out of your cylinder heads by following five easy rules.
An important part of keeping the investment in line was retaining the production gt40p heads. Ford v8s have always struggled to make power because theyve always been limited by factory cylinder head design. Step by step the smallblock ford has never been blessed with particularly good cylinder heads in its halfcentury service life. I wanted to add bbk headers to the gt40 heads, but im not sure ill need them. Looking for a cam tfs stage 1, xe270hr, afm n41, xe274. Cylinder head guide for your street stang heads of the. I already have a set of e7tes that im in the process of porting and polishing and came across an article online that told me the gt40 s and gt40ps flowed much more stock than the e7s im working on and now my work is at a standstill cuz im not too sure what path to take. Home the p head exhaust port has a lot of sharp edges and can really benefit from just a little grinding.
To squeeze some more ponies out of your fox body mustang, upgrading the cylinder heads can lead to some substantial results. The p head exhaust port has a lot of sharp edges and can really benefit from just a little grinding. Youll find the older heads each have 4 small holes on the head surface that the gt40s lack. Z2 head cylinder head the z2 head aluminum small block ford cylinder head features an advanced velocity vane intake port design that delivers outstanding streetstrip power. Gt40 gt40p heads were a more free flowing cylinder head that outperformed the factory e7 heads that were found on most 5. Its just a big step forward for anybody wishing to learn about porting period. You dont need an air compressor to port your heads. Cylinder head porting basics popular hot rodding magazine. Learn to use top of the line equipment, including the 620 superflow flowbench and a computerized cam profiler. David vizard is a revered engine builder, technical writer, and author. The gt40 cylinder heads quickly gained a reputation as being yard gold.
Fe cylinder head casting numbers 332428 ford fe engine forum. Cylinder head porting isnt just about increasing volume. E7 heads, no porting whatsoever 306, printed and balanced, stock rebuild 10 timing, 40psi static fuel pressure valvoline r1 2050, ive used this exclusively and i must say im pretty impressed with the inside of the motor. The dvd is pretty dry, but if you watch closely and pay attention, youll learn a lot about the rudimentary steps to porting almost all cylinder heads. Apr 09, 2017 the original gt40 race heads also flowed 195cfm on the intake side and 152cfm on the exhaust side at. Gt40 100% return guarantee fast shipping, no duties. The suggestion above for gt40 or gt40 p heads would be a good cheap alternative if you were running a 302. These heads have been remanufactured using refaced reclaimed factory valves. These heads feature closed style 64cc combustion chambers and 190cc intake runners. Im not sure how important it is, but i took some advice and drilled them.
Youll also learn how to select the proper cam, intake, and carburetors to achieve maximum results. Special thanks to the vintage mustang forum group on. It was a success because the modified ho head castings actually flowed better than the 68 gt40 race heads. Like other stock castings, there is plenty of room for improvement with this head. Volume always helps power, but we want smooth volume. Determine what port area you need and try different shapes to get the flow up without increasing the area. There is a lot more here on speedtalk than there is in any book. Ported e7s are nice, but the gt40 heads are better, in my opinion. These heads will accept all factory bracketery and accessories designed for289351 w and mustangs gt40 and more. Fords gt40 cylinder heads fox body mustang mods cj.
Ford gt40 cylinder heads brzezinski racing products. As you said, the p heads require a specific header, but the regular gt40s dont. I picked up some gt40s non p i believe were off an explorer. The problem wit porting books is that there are none that actually tell other than a novice anything. Sep 05, 2006 cylinder head porting head porting basics get more power out of your cylinder heads by following five easy rules. Whether you race pro stock, super comp, or just want to rebuild your old chevy 350 small block, there are cylinder heads just for you. This book will have new information for everyone and will be a musthave for longtime enthusiasts and new owners alike. Alex engineered his first drop in style spring kit for gt40 sb ford back in 2003. If your reffering to the gt40 iron, like the heads that came factory on the 9395 cobra, and early ford exploders, they arent a whole lot better, the valves are bigger 1. The porting and polishing process is broadly the same for all cylinder heads.
Fords gt40 cylinder heads fox body mustang mods cj pony parts. They are a direct fit, keep the gt40 rockers and everything. Ford racing 289302351w aluminum cylinder heads jegs. Complete aluminum cylinder heads sbf fits ford gt40 289 302 351w 190cc 62cc. As our foxes get older and more collectible people are starting to look at what performance parts were available in the early days and this post talks about the gt40 family of intakes. Ford racings gt40 series of smallblock ford cylinder heads has been around for what seems like, forever, as we bet some of you can remember the original castiron heads that had us all going. David vizards how to port and flow test cylinder heads. Add this dvd to some books and other online information, and you will be well on your way. These are fords bestflowing production cylinder head for the pushrod 5. How to identify gt40 cast iron heads it still runs. They also installed gt40type castiron cylinder heads, the tubular tuned manifold, tubular stainlesssteel headers, larger intake 1. Smallblock few things determine an engines personality more than cylinder heads, camshafts, and rocker arms. Preplanning reiterating, the internet is a valuable tool for the novice. Porting cylinder heads allows you to flow more air and unlock hidden.
Jul 23, 2006 that chart has mixed together the 6049 head assembly numbers with the 6090 head casting numbers, rendering it rather useless. Hey guys new to this forum and looking for some input on a cam. What is cylinder head porting, and how does it increase horsepower. Find great deals on ebay for gt40 heads and gt40p heads. Everyday low prices and free delivery on eligible orders. Modifying small block ford cylinder heads mre books. Author vizard covers blending the bowls, basic porting procedures, as well as pocket porting, porting the intake runners, and many advanced procedures. Porting these e7 heads, even an a job, may yield a 30hp gain. Flow characteristics are yet another and both port or polish can change the dynamics of the head. My running temps are perfect, even a bit on the cool side. I assumed before i really thought about it this morning, that there was already an empty. Weighing in at approximately 22lbs half the weight of cast iron heads. Book depository books with free delivery worldwide.
Its a job for only the mostskilled of mechanics, but head porting can lead to some impressive power gains if performed properly. Complete aluminum cylinder heads sbf fits ford gt40 289 302. They were most famous for their debut on the 1993 cobra. So far i have covered a lot of technical details that could be described as peripheral. Without question, cylinder head porting is a science. Even without porting the exhaust, they will flow much better than any iron heads you can buy, except for the gt40p which i use best thing is, pull your head off, put this one on. That might have been the end of the discussion if the cobra were the only vehicle that the gt40 head came equipped on but several other ford vehicles, including the ubiquitous explorer and mountaineer, were also equipped with gt40ps, a variant of the gt40 cylinder head. The 221s very modest cylinder heads employ small ports and wedge 43. This guide contains a fox body cylinder head flow chart and information on available upgrades, ranging from the stock e7 heads to fully prepped, cnc machined aluminum beauties. Cast from 356t6 aluminum, these cylinder heads from ford racing are the perfect solution for bolt on horse power. Gt40gt40p heads were a more free flowing cylinder head that outperformed the.
The act of removing metal from the intake and exhaust ports to increase airflow has been used for decades, and in most cases, a skilled head. Jan 16, 2015 developing highly functional cylinder heads for performance applications part 10 january 16, 2015 by muscle car diy so far i have covered a lot of technical details that could be described as peripheral. Jun 03, 20 stacey shows off engine builder, jon kaases, new p38 small block heads that you can get bare or fully dressed to add to your existing engine. Because porting isnt something that anyone with a dremel can do, youll need to hire a professional to port and polish your cylinder heads, and.
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