Gt40 cylinder head porting bookshelf

The p head exhaust port has a lot of sharp edges and can really benefit from just a little grinding. On july 21, 20 jeff lost his battle with adenoid cystic carcinoma. 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. What this all leads to is a fairly rough cylinder head, affecting the fluid flow as it makes its way through the side of the cylinder head and into the cylinders via the valve throat. Starting with the outboard side of the throat, as with the intake, the throat. See the results and comparisons of a flow test on smallblock engine heads, only on. Port it yourself cylinder heads automotive mechanic. May 08, 2015 cylinder head porting operates under a pretty simple premise. Picking up 50 cfm of cylinder head airflow does little or nothing at 2,000 rpm because there was not an airflow shortage at that speed. When undercover ported, the gt 40 head will flow 202 to 210 cfm intake and 145 on the exhaust side. Tre racing engines drag race, nitrous, ls, blown, race. How to identify gt40 cast iron heads it still runs. Id like to rebuild my old 176k gt40p engine for reuse in place of my v6 truck engine. Unless those gt40 heads have better valvesprings and some porting any cam over.

They are popular because while they are relatively inexpensive they also offer a measurable increase in power to your engine. Again you can see the reshaped valve guide boss and the smothed transition to the port. They are brand new bare castings that have never been installed or assembled. The gt40 heads were originally designed for the mustang cobra the performance version of the mustang and were cast iron. The casting number, if located on top, is in the center of the gt40 head. The customers heads had stock springs and he was getting ready to change cams. The keeper groove in the stock exhaust valve left is lower than with nonrotatorstyle valves because gt40p heads use shorter springs and a thicker retainer. Fords gt40 cylinder heads fox body mustang mods cj. These gt40x heads feature a 64cc combustion chamber to greatly improve the airflow over the original gt 40 design allowing you to bolt on 65 more horsepower. Summit racing sum900630 summit racing 3piece nonferrous deburr kits. The gt40 p cylinder head is popular for classes that must run a stock ford production head. Apr 10, 2004 i am trying to find the specifications on the original gt 40 cylinder heads used on the 289s in the mid 60s.

Consequentially, mez porting has ceased trading in all respects. We contacted every major manufacturer and invited them to participate by loaning us an off the shelf head. Like other stock castings, there is plenty of room for improvement with this head. Gt 40 aluminum cylinder head instruction sheet no part of this document may be reproduced without prior agreement and written permission of ford racing performance parts is18500029 page 3 of 3 tech hot line 586 46856 factory ford shop manuals are available from helm publications, 18007824356 cylinder head. Some castings had thermactor bumps in the exhaust port. How much can you really gain with a home ported head. I figured i would post some pictures along with some details later about my porting experience. Even if you are planning to use a set of offtheshelf pistons, which provide. Jul 19, 20 porting cylinder heads has long been a right of passage for serious hot rodders looking to add power on a modest budget. Do the gt40 and gt40p heads have a typical milling point to go to or stop at. Sep 30, 20 the cylinder head installation is a thorough process and there are steps you must take to ensure proper cylinder head alignment and torque specifications. Head to head flow testing small block ford cylinder.

Porting and polishing kits free shipping on orders over. As you said, the p heads require a specific header, but the regular gt40 s dont. To identify your gt40gt40 heads, look for a gt or gt40p stamp. Port it yourself article gm hightech performance magazine. To identify your gt40 gt40 heads, look for a gt or gt40p stamp. To tell the difference, take a look at the castings on the heads themselves.

Porting heads involve using a rotary tool dremel and a burr to restructure the passageways to optimize air flow through the cylinder head. This intake has been welded in the corners to allow further porting. June 2010 my brother mark has edited this video of him porting a straight 8 stutz cylinder head. Porting gt40p heads pics inside maverickcomet forums. Back then, there wasnt a lot of choice for staggered tip length sb ford heads. Most ford motorsport ctrate motors were fitted with these heads and the gt40 tubular manifold. Ford gt40 cylinder heads brzezinski racing products.

O2 sensors, egt sensors, and standard fuel oil sensors all standard on each engine. Ok, he wanted one specifically about sr20 heads, but at a general level porting a cylinder head is more or less the same across the board, though of course there are important differences that pros like. On the other hand, 50 additional cfm at 6,000 rpm, where there are only about 14 milliseconds to fill the cylinder, could pay off big time. To verify, gt40p is also cast into the head usually. Our dyno room, this is a state of the art superflow 902 dyno with the latest in data acquisition. Dec 29, 2014 gt40 head porting if this is your first visit, be sure to check out the faq by clicking the link above. In addition to this responsibility, the cylinder head also plays a role with. Special thanks to the vintage mustang forum group on fb. If you know anything about the car in the video or who the person is at the end chatting to dad, drop me. The ports were small and restrictive, even for a stock engine. Between 1993 and 1995, mustang cobras came equipped with a type of cylinder head called a gt40.

Part 21 cylinder head porting terms and tools 620 hp 454 big block chevy engine build duration. Gt40gt40p heads were a more free flowing cylinder head that outperformed the factory e7 heads that were found on most 5. Late model restoration offers a wide selection of aluminum and cast iron cylinder heads for 4. Discussion in technical started by jap901, apr 8, 2005. It needed to fit the heads without machine work, produce a decent seat and open load and allow for at least. Gt40 heads ported and polished mustang forums at stangnet. These cylinder heads were a vast improvement over the e7te cylinder heads that came on most fox body mustangs. Imho, the exhaust to intake ratio makes them ideal turbo heads, but their smaller chambers means alittle higher compression you will have to run a little lower boost unless you swap to dished pistons. Alpha performance r35 gtr cnc race ported cylinder heads. This is my first attempt to modify any cylinder heads.

Intake bowl after basic porting but before enlargement for 1. Some ported gt40 cast heads and i amwas going to use a holley. Small block gt40 cylinder head specifications gt40s. Remove unnecessary casting material, smoothing out imperfections, and polishing the chambers are all part of the process. These aftermarket heads feature ported and polished ports to ensure you are getting the most performance out of your mustang. They were most famous for their debut on the 1993 cobra. Porting and polishing set, deburr kit, nonferrous, 6 in. Gt40 heads are a factory small block ford head found on a certain vehicles. We sent our project rh9 gtrs cylinder head to naprec in japan to undergo the process. Featuring top brands such as afr, trick flow, ford racing, edelbrock, and holley. If your reffering to the gt 40 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. If the injection manifold is to big for the cylinder head runner volume the engine will lack torque and feel soggy untill the air speed rpm gets up.

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. First, remove the valve cover from the top of the cylinder head using a 38drive ratchet and the appropriate socket. The flow at low, mid and high lift has to be balanced a certain way to achieve the most effective power curve. Gt 40 aluminum cylinder head instruction sheet no part of this document may be reproduced without prior agreement and written permission of ford racing performance parts is18500029 page 3 of 3 tech hot line 586 46856 factory ford shop manuals are available from helm publications, 18007824356 cylinder head featuresspecifications. Our rotary porting story has been getting a lot of reads lately, and one of those readers sent me an email asking if id do a cylinder head porting story for piston engines. You can pick up b and e alphabet cams cheap, but theyre 20 year old technology. 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. Sep 01, 2017 part 21 cylinder head porting terms and tools 620 hp 454 big block chevy engine build duration. Fords gt40 cylinder heads fox body mustang mods cj pony parts. Video shot by mum in the 90s judging by the cossie on the driveway.

Sight the port and get things as straight as you can focusing on the centerline of the cylinder get a. My goal was to create a set of heads that flowed well for cheap. Initial assessment of stock gy6 head and proposed corrections. My advice to you is to talk nicely to your local engine shop, they should be able to work it out. You can see where i smoothed the guide boss and the transition to the port itself. I have seen a pair once, but it was quite a long time ago and i was not able to obtain the info. After discussing the cam specs, alex smiled and agreed to build a kit for him. Cylinder head porting services brzezinski racing products.

Even mild porting like this can yield fair results. What is cylinder head porting, and how does it increase. Should have probably took those hours and stayed at work and bought some afrs lol. Ported gt40 side by side with nonported gt40 youtube. Pbf had all of the heads, unported and unmodified, on the shelf, so all we. Increase the horsepower and torque output of your push rod 5. 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. Gt40 gt40p heads were a more free flowing cylinder head that outperformed the factory e7 heads that were found on most 5. Here is a quick look at what ported gt 40 intake looks like compared to non ported gt 40. Bob, jeffs brother, is now running modern cylinder head. Gt40 head porting well i am trying my hand at porting my gt40 heads,any input on how to do a better job. Head to head flow testing small block ford cylinder heads. Gt40p heads have fastburn chambers and will need a few degrees less timing than conventional heads. Exhaust bowl after porting but before being cut for bigger valve.

Build a high performance head, on the stock casting with limited tools and a very limited budget. 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. How to install cylinder heads on a small block ford. These heads have been remanufactured using refaced reclaimed factory valves. The cylinder head installation is a thorough process and there are steps you must take to ensure proper cylinder head alignment and torque specifications. What will the power difference be on a 351w engine from a pair of c9oe 351w heads that have 1.

The support from the racing community, family, friends, customers and vendors is appreciated during the last few years. A gt40 head will have 3 vertical bars on the front of. Its tough to hurt a factory cast iron head by porting, unless you get greedy. Port work was done by tmoss porting, i was able to get the intake from ruffino mustang parts. The cleanest sleeperlooking 92 fox had a cobra intake, comp shelf. Stock air flow on this head tops out at 190 cfm intake and 128 cfm exhaust. When undercover ported, the gt40 head will flow 202.