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Ford Performance E303 Performance Camshaft (85-95 5.0L)

Item 24069
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      Review & Installation Video

      Hello and welcome back to Stage 3 of AmericanMuscle’s project Foxbody, as you can see we’re currently out enjoying the fruits of our labor which took place in the first two stages, and for the first time since we started this project, I can honestly say I’m not embarrassed to be out driving it. Of course a part of that lack of embarrassment is because we haven’t pulled up to anything fast yet, there’s no doubt our GT is looking good, but what’s the point of having all those Cobra parts if we don’t have the performance to back it all up, well, welcome to stage 3 my friends, where all of that is about to change. Before we get back to the shop where we lay out our plans to increase our tire slaying abilities, let’s recap what we knocked out in stage 2. In stage 2 we completely replaced our destroyed factory convertible top, with a brand new top and rear glass, along with just about every piece of molding and weather stripping you can think of, we put the finishing touches on our convertible Cobra vision, thanks to our Cobra tail light covers and 10th anniversary Cobra style wheels, made possible through the 5 lug conversion kit we installed. Finally, we moved to the interior and made it look as good as our exterior, thanks to the freshly painted dash, new carpet, and other miscellaneous items making our GT look and feel like it was 1993 all over again. Alright, I can’t wait to get back to the shop to show you all the stuff we have in store for this stage, let’s get to it. As you can see we have some big plans for our 302, all with the goal of replicating the Cobra’s power plant, which is going to drastically improve our performance. For starters, we’re going big with a trio of parts from Ford Racing, all of which will do wonders for our 5.0. First up we’re looking at the Turbo Swirl GT40X aluminum heads from Ford Racing, these heads are a variation on the original GT40 heads found on the 93 Cobra, with a few improvements. For one they’re made out of lightweight aluminum versus the heavier cast iron and they’re designed to flow much better than the original GT40’s. To top it off, we’ve installed some Cobra valve covers. For us to see the biggest gains using these heads, our stock cam just isn’t going to cut it, so we’re going to go with a popular street cam, the Ford Racing E303. This hydraulic roller cam should really compliment those GT40’s, and is an excellent choice for any street car thanks to its low to mid range torque. Of course we’re still going to have that great lope at idle which should sound amazing by the way, but it’s not radical enough that we’re going to have to worry about stalling out at every red light. The cheery on top for our 302 has to be this Ford Racing intake manifold, which is getting nearly impossible to find anymore, this part, paired with our Ford Racing heads and cam, is going to allow our 5.0 to flow some serious air, and will complete our Cobra transformation under the hood. Alright, in order to move all that extra air out of the engine, we’re reworking out entire exhaust from the headers all the way back, in order to keep up with that Ford Racing theme we’ve got going on under the hood, we selected our ceramic shorty headers, which we’d already installed when we did all of our motor work, and are designed to work specifically with those GT40 heads. From there, we go to BBK’s off road H pipe which does feature mandrel bent 2.5” stainless steel tubing, and should bolt up to those shorty headers without issue. Finally, everything’s going to exit out of Flowmaster’s American Thunder Cat-Back exhaust, which features those iconic 44 series mufflers. This exhaust features 100% stainless steel constructions throughout, including 2.5” mandrel bent tubing, and those OE style polished tips. Alright I think it’s safe to say we’ve got the performance side of things pretty well taken care of, but we haven’t addressed the fact that this thing still handles like a boat. So we’re going to attack our suspension much like we did our engine, go big or go home. Ron and I are just finishing up installing the KONI STR shocks and struts, which are actually a killer set for the price. We’re pairing those up with the SR Performance lowering springs, which should lower our Fox about an inch and a half on all 4 corners. Finally, we have the car in the air, the wheels off, we figured this would be a great time to ditch those rusty old drum brakes, in favor of these brand new disks. To dial in our new Fox’s alignment, we’ve installed the SR Performance caster/camber plates, which should get everything back into spec without issue, and offer a little bit more adjustment in future if need be. Since our car is a convertible, we are losing some of the structural rigidity which comes along with having a steel roof, to help combat this, we’ve installed the SR Performance subframe connectors, this part along with our springs, shocks and struts, should take all the laziness out of our suspension, and get it handling like a sports car should. Alright, now everything’s pretty much buttoned up, we’re going to tie it together with one of our custom Bama tunes, and see if all this hard work has paid off in really cranking up the power. We’ve already grabbed our baseline run after stage 1 when we got the car back from painting, so I’m going to hop in, bury this thing one more time, and see what the improvements are. Alright, our baseline run with our 93 GT gave us 194 horsepower, and 266 ft/lbs of torque. With all of our stage 3 modifications, the car put down an impressive 279 horsepower, and 317 ft/lbs of torque, making for a solid gain of 85 horsepower over our baseline numbers. The car did even better throughout the power band, picking up as much as 103 horsepower, and 107 ft/lbs of torque, throughout the curve. With the power finally there to back up our Cobra appearance, I think it’s time for one more cruise to see how our Fox does with all its modifications. Alright, stage 3, performance, check. The car's breathing better, the tune brought it all together, and as a result, this thing has some serious balls. Here we are, we’re in the back roads, moving along at a good clip, I’d saying the car is doing quite well, it’s pretty confident, I feel confident driving it, I don’t feel like I’m going to fly off the road, which I couldn’t have said before we did all this work. The car feels good, sounds awesome, and it’s just a whole hell of a lot more fun to drive. I know some people might question this build, you know, why a convertible, why a Fox body, well, because we wanted to, I mean that’s what car building is all about, it’s doing what you want. In this case, we’ve never seen Cobra convertible Fox bodies, so we wanted to build one, and I think we did a hell of a job. So is this the last you’ve seen of this car? I don’t know, maybe, maybe not, but in the meantime, thanks for watching stage 3 of AmericanMuscle’s project Fox body.

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Improved Street Performance
      • Great for Naturally Aspirated Mustangs
      • Hydraulic Roller Lifter
      • Sold Individually
      • For 1985-1995 5.0L with 1.60 Rockers


      Street Performance. This Ford Racing cam is a great replacement choice for excellent Low and Mid Range Torque, and a Good Idle. The Ford Racing E303 Performance Camshaft is also a great choice for naturally aspirated 5.0 Mustangs.

      Installation Note: This Ford Racing E303 Performance Camshaft requires upgraded valve springs for proper operation. Valve spring requirements: 120 lbs valve seat pressure minimum 295 lbs open. For stock cylinder head applications, the use of Ford Racing M-6513-A50 valve springs installed at 1.820" are recommended. For use with aftermarket cylinder heads, Ford Racing M-6513-BH valve springs are recommended.

      Application. The Ford Racing E303 Performance Camshaft is designed for use in the 1985-1995 5.0L V8 Mustangs with 1.60 rockers.

      Technical Notes. Ford Racing recommends the use of a Hi-Stall torque converter for Mustangs equipped with automatic transmissions.

      Fitment: 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995

      MPN# M-6250-E303

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (33)

      Write a Review

      Ratings Summary

      4.8 out of 5 overall rating from 33 customers

      Installation Time: Full Day

      Installation Cost: $500-$1000

      • July 22, 2019

        5 1988 GT - AnaG Installation Time: Afternoon


        The camshaft is Working really good it’s an amazing part love mustangs

        Helpful (2)
      • January 16, 2019

        5 1987 GT - SteveW Installation Time: Full Day

        Cam upgrade

        Good quality, fast shipping, great technical support.

        Helpful (3)
      • September 04, 2018

        5 1989 GT - Stangman77 Installation Time: Afternoon


        The perfect camshaft for a mild build , if you are looking for a nice lope, great sound without changing a ton of parts , or spending a ton of money this is the cam for you

        Helpful (7)
      • April 12, 2018

        5 1994 GT - AndrewP Installation Time: Afternoon

        Great Cam

        This a perfect cam for good torque and good midrange power. Perfect for daily street use. Gives a good muscle car throaty sound. I've used this in a Fox Body and SN95. A very good affordable cam.

        Helpful (12)
      • December 01, 2017

        4 1990 GT - JoseR Installation Time: Afternoon

        Good for the money

        The instal was straight forward tho the results felt a little different than expected. At first it felt slightly improved but I think that was on part of the computer after about 1hr breaking in so the computer learns the new specs the performance increases another bit.

        Helpful (13)
      • November 03, 2017

        5 1995 GT - Carlos Installation Time: Shop Install Installation Cost: $500-$1000


        Put on some GT40P Heads with the upper and lower intake. Along with some other basic bolt-ons, and I can't wait to get it to the dyno to see how much power I'll make. This is perfect for street/strip use. Even though there are better cams out there this the best for the money, daily driveability.

        Helpful (10)
      • August 25, 2017

        5 1988 GT - 88fox

        Angry Muscle Car

        I can't express how much this cam has changed the way people view my fox. The performance and sound of my car has changed tremendously, I would highly recommend this to any foxbody owner!

        Helpful (15)
      • August 24, 2017

        5 1990 LX - Greasers1 Installation Time: Afternoon


        E303 cam works great. Installed gt40 p heads, gt40 intake, e303 and car pulls now. Poor man build. Great upgrade from stock.

        Helpful (24)
      • August 20, 2017

        5 1993 GT - AustinC Installation Time: Afternoon

        Im in Awe!

        I love this cam, its like I am driving a whole new beast!. This cam works great with my GT40 Heads and new lifters and push rods. Best purchase that iv made so far.. Maybe besides gears lol

        Helpful (12)
      • April 11, 2017

        5 1990 LX - Stangboy89

        Great product!

        This is a good bang for the buck. Nice sound and great performance upgrade.

        Helpful (11)

      Questions & Answers (43 answers)

      5 Top Rated Questions

      will i need to get a tune with this cam?

      • This Ford Performance E303 Performance Camshaft will not require a tune, however, a tune would be beneficial to get the most out of the upgraded camshaft.

      Helpful (9)

      If you are a daily driver but races from time to time would a E3O3 camshaft be better or a B3O3 for the best hp gain? Also I am ok with lowering gas mileage.

      • Both the Ford Performance E303 Performance Camshaft and B303 Performance Camshaft will work for street or strip use. The biggest factor used to decide between the two will be the rest of the components in your build, as this can be used to determine which cam will complement the remainder of your mods best. The B303 will have more duration, and more overlap, but less lift than the E303, leading to a power band that will typically peak higher than the E303, but will also start at a higher RPM. Additionally, the B303 will have a rougher idle.

      Helpful (4)

      I am building a high comp 331 stroker! The dome pistons i have selected are +9.0cc, and stock heads for now with stock lifters, Do I need to worry about piston to valve clearance? And is this an appropriate cam for a cruiser/weekend warrior?

      • need to always check piston to valve clearance !

      Helpful (4) Show 2 more answers

      Will this not work on a 1983 5.0L ? I have a carbureted model but it is a 83 and I wonder if this will fit this year ?

      • The Ford Performance E303 Performance Camshaft will not work in a 1985 as this cam is designed for a hydraulic roller cam motor, and only 1985+ motors are roller cam motors.

      Helpful (3)

      I have a few questions. How hard is the install for someone that’s new to this stuff? Can you access the camshaft without pulling the motor? And what do you have to pull to access the camshaft?

      • Installing the Ford Performance E303 Performance Camshaft will be a fairly complex install. You will need to remove the valve covers, rockers, and valvetrain, as well as remove all front engine accessories to gain access to and remove the timing cover. To pull the camshaft out with the vehicle in the car you will also need to remove the radiator, fan shroud and fan, as well as the A/C Condenser to allow removal of the camshaft.

      Helpful (2)
      10 More Questions
      i have a 5.0 out of a 93 bronco, i am putting it in my 89 mustang. will this cam work in that engine? 1 answer
      can i use this cam wiht a stock car with an auto tranny 1 answer
      Is they're a different part number for valve springs I should use with factory gt40 heads? Or is it the same part number for stock cylinder heads in the desciption? 1 answer
      Can I run this cam with a turbo? 3 answers
      I'm looking at putting the e303 in my 94 5.0, besides valve springs any other parts you would recommend switching out ? 1 answer
      What is the CARB OE number for this cam? 1 answer
      I have a 1990 mustang 5.0 ho got gt40 intake upper and lower 70mm tb cold air intake 24lbs injector msd ignition t5 with 3.73 gears stock e7 heads will this cam work for me got stock rockers lifters valves and springs? 1 answer
      I want to do this cam the e303 I have a aod transmission do I have to do anything to the trans ? 1 answer
      Tune requiere? 1.6 Rockers are necessary? 1 answer
      I have a 95 GT would you happen to know what the power gain is with this cam 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Camshaft

      Tech Specs

      Ford Racing Data Sheet
      Part Number: M-6250-E303 Rocker Ratio: 1.60
      Lifter Type: Hydraulic Roller Lifter Engine Type: FORD 5.0 (1985-1995)
      Lobe-Center Int. 110° Lobe-Center Exh. 110°

      Intake Exhaust
      Valve Lash: Hyd. Hyd.
      Duration: 282° 282°
      Duration @ .050" Lift: 220° 220°
      Valve Lift: 0.498 0.498
      Lobe Lift: 0.311 0.311

      Valve Timing @ 0.05" Lift: Open Close
      Intake: 0° BTC 40° ABC
      Exhaust: 40° BBC 0° BTC

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