i have a 1992 f150 4x4 with the 5.0 in it stock right now.. i have my old 302 bored .40 over that needs a rebuild... i plan on building it up and i know that im gonna get rebuilt gt40p heads and 1.7 roller rockers with a mustang intake and 24 lb. injectors.. i was thinking about gettin the e303 cam but i have heard both negative and postive things about it and i just want to know what cam would go best with this setup.. and do i need longer push rods with the gt40ps? also ive heard that stock 302 manifolds wont bolt to gt40ps, is that true? would i need a new computer to run the e303 and 24 lb injectors?... any info would be helpful

 

If I take this right that you're starting with a 40 over block that needs a rebuild again, then you really need to find a standard bore block to work with. A roller block that's already at 40 over is at it's limit now. As for pushrods, no change needed there, other than to use new ones as roller cam pushrods tend to wear at the rocker ends as they do not rotate in service as flat tappet rods do. What I would do were I in your shoes is swap to a 351W instead of building the 302. You can use the extra torque the 351 gives you to better move the truck.

 

I don't think an E303 cam would run well at all in a vehicle with a SD EEC. And it wouldn't be as easy as just swapping in a MAF EEC, you'd need to repin the harness. Or get an overlay harness.

You need a computer friendly cam, something ~210 degrees duration.

Stock manifolds will bolt up to GT40 heads, no worry.

 

If i was you i would call a reputable camshaft manufacturer and ask them what cam they would recommend for your specific application.

 

well this engine only has a little over a hundred thousand on it and the only thing that really needs to be done to block is just to hone it, and im just going to completely rebuild because i want to build the engine up... so from what i understand if i go with the e303 then i need a different computer?.. also from what ive found with this combo is that i need to replace valve springs?

 

You would need at the very least a new computer, a mass air sensor, a MAF injector harness, and an overlay harness pinned into the existing harness.

The e303 cam is a twenty year old grind. It may have been okay in its day but there are much better cams available. Ones that will work with your stock computer. Even if someone gave you an e303 cam it would be far, far cheaper to buy a computer friendly cam than to convert your vehicle to MAF.

 

Call a camshaft company. They will tell you EXACTLY what cam will run best with your combo

 

There are several over-the-counter cams that will work with the stock EFI system in your truck and produce substantial power gains.. including the Comp 35-512-8. The stock truck intake is significantly larger than the Mustang version so I'd suggest you keep the stocker, and I'm not sure of the wisdom of doing all this work and then using the stock exhaust manifolds, if you also retain the stock Y-pipe and cats then you really won't see much of a gain since this part of the exhaust is the second biggest restriction on these trucks after the cam.

 

Gee you must be a cam company employee.

 

ok thanks for the info... conanski, i have heard that you know what you are talkin about so ill take your advice, what should i do about my exhaust then? truck has no cat or muffler just the straights after the y pipe... And what abou an explorer intake?... if i go with the 35-512-8 then would gt40ps and 1.7 rockers still make a significant difference or would i be better off with a different set up?

 

Lol, I am not employed by a cam company. I just think its silly to try and guess what cam will work best when there are experts with vast amounts of knowledge on the subject just a phone call away.

 

And even some of those "experts" are guessing as well, not having actually installed and run the cams they're recommending in the actual application (engine/trans/rearend combo) They're going by the same basic skill set many of us here have.

 

There was a guy on here a little while ago that installed a cam recommended by a cam company and his truck would not idle.. period. Problem is when you say 5.0 the ONLY thing they know is 5.0 Mustang and much of what works or works well enough for a 1/4 mile pass is simply no good at all with the more basic SD EFI system in these trucks.

 

I'd say lose all that install shorties at the very least and duals for simplicity.

It's a sideways move at best and complicates wiring and throttle cable connections so there's no point.

P heads will make a significant difference but they create header issues which aren't worth the hastle so if you can't find regular GT40s look for something aftermarket, but even with the stock heads you stand to see healthy gains from the cam and exhaust work.

 

Nobody knows these old trucks like Conanski.