Skip to main content ↑ ↓
Topic: E303 with GT40P Heads (Read 7285 times) previous topic - next topic

E303 with GT40P Heads

Now that I have two birds,I want to beef up the 5.0. I have a HO EEC-IV,a E303 Cam,and a GT-40 EXplorer intake. Just wondering if the GT40P'S will cause piston to valve clearance problems. I dont have heads yet but can get GT40P'S or E7'S. I know the 40p's are better just want to make sure they will be OK before I buy a set.

E303 with GT40P Heads

Reply #1 –
I’m assuming you have an E6 bock w/ flattops
Almost all get lucky w/the E7s I don’t think I heard of anyone having a problem, though some will tell you to still do a piston to valve check. Pretty sure the regular gt40 will have similar results but be more careful bigger valve and I think I herd of one or two lucky people out there. Now as for the gt40p head it has a smaller chamber and I never herd of anyone put them on an E6 motor.

SCRATCH SCRATCH SCRATCH SCRATCH SCRATCH SCRATCH SCRATCH
 I just reread your post your going w/the E303 cam now you just tighten the odds even more.

E303 with GT40P Heads

Reply #2 –
I know. I  see that there are several people running e303's with e7 heads and a e6 block,so I guess I will go that way.

E303 with GT40P Heads

Reply #3 –
You'll need mass air with that E303...

E303 with GT40P Heads

Reply #4 –
X2.I know first hand about that.
'88 Sport--T-5,MGW shifter,Trick Flow R intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,75mm Accufab t-body,3G,mini starter,Taurus fan,BBK long tube headers,O/R H-Pipe, Flowamaster Super 44's, deep and deeper Cobra R wheels, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..

E303 with GT40P Heads

Reply #5 –
I have the pigtail and meter from a 92 5.0 GT. What else do I need to go Mass Air? I found a article on hooking up the meter to the EEC-IV, is that what you did?

E303 with GT40P Heads

Reply #6 –
You need the Mass Air EEC... Most of the time they'll be ID as A9L or A9P...

E303 with GT40P Heads

Reply #7 –
Another computer to search for is an A3M or A3M1.  It was a service replacement for the A9L & A9P.  They are not as commonly known, so prices are often considerably less (perceived as less desireable).

E303 with GT40P Heads

Reply #8 –
I run the A3M
88 TC with 93 GT 5.0 (.030 over), XE266HR Compcam, SVO 1.6 Roller Rockers, BBK underdrives, BBK 1 5/8" headers, 2 1/2" exhuast with Americian Thunder Flowmaster lers. Tremec 5 speed and 3.73's and alot of other goodies to list.....

E303 with GT40P Heads

Reply #9 –
I would say throw the E-303 cam in the trash...or E-bay it to a mustang guy...*IN MY OPINION*, the entire alphabet cam line is junk...Lunati makes a few real nice cams with more exhaust duration...I drove an E-303 equipped 'Stang with headers/T-5 and 3.73's...it had mass-air and still refused to idle when cold...I couldn't even come close to imagining driving with an AOD behind it...definitely suffered on low-end torque...the car was stripped down to around 2700lbs and ran 12.70's on DR's...but wasn't very fun on the street.
Project 3G: Grandpa Grocery Getter-'85 Crown Vic LTD 2-door, 351W with heavily ported/polished GT40 heads, heavily ported/polished Typhoon Power Plus upper & lower intake, Comp Cams 265DEH retarded 1*, FAST EZ-EFI, HD T5, 8.8" 3.73 trac lock with extra clutches, 3G alt. swap, '99 CVPI front brakes, '09 CVPI rear disc brakes, '00 CVPI booster&m/c + wilwood adj prop valve.

Parted & Gone-'88 T-bird Sport, 351W swap, ported GT40 heads

E303 with GT40P Heads

Reply #10 –
Um,well,I have an AOD and the E303,and the car has some wicked mid-range power,and idles a little "loapy",but is great.I have 3.55 gears.When I floor it from a stop,the tires don't have a chance (255 40 17).
'88 Sport--T-5,MGW shifter,Trick Flow R intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,75mm Accufab t-body,3G,mini starter,Taurus fan,BBK long tube headers,O/R H-Pipe, Flowamaster Super 44's, deep and deeper Cobra R wheels, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..

E303 with GT40P Heads

Reply #11 –
My experiene with the E303, fuel injection and a manual trans, was not positive.  It surged and stalled quite often.  It would also buck at a low (engine) speed in any gear.  When it did idle it sounded pretty tough, but what a PITA. 

When I swapped the long block to another car, it was carburated with an automatic (with a stall converter). Then it was pretty easy to live with.

The fuel injection set up may have run better with a custom chip tuned on a dyno.  I had a mail order one (specifically listing surging and stalling as the main runablity problem).  It helped, but it was still miserable to drive.

E303 with GT40P Heads

Reply #12 –
Most of my reading on the computer is not positive for the E cam.
I think I read this on corral which made me laugh they stated there’s only 1 E-cam out there and we keep passing it along to the next guy.

E303 with GT40P Heads

Reply #13 –
Yea alot of people told me to sell the E303. I decided to go with a stock HO cam instead. That way I dont have to find another computer, plus it isn't going to be my race car, I have the 87 for that.

E303 with GT40P Heads

Reply #14 –
I hope you're not using the stock T-bird short block. If you are those pistons are going to bend the valves on the GT40P heads.
88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, bunch of other stuff.