Future 351 w build plans

[BucksTrucks]

1991 F150 4x4 5.0 m5od 4.10 gears 200k miles 4'' lift with 32'' ties. Engine and trans are getting tired and I am saving up money for a 351w/zf 5 speed swap. So the trans part is easy not worried about that. But I was thinking about what parts I am going to need. I would like to step it up in the power department i was thinking of getting the 94-97 roller 351, maybe some GT40 heads, and a mild cam, and headers. So far parts I figure I will need for the swap 351w motor mounts 351 lower intake manifold 351 ecc dizzy for the roller motor? flywheel I would like to retain as much of the 5.0 EFI/smog system as I can . Am I going to run in to issues with the above mods with a stock 351 computer? How about the EGR system? I would prefer to leave it all stock as I live in California even though I do not have to have the truck tested. I would be more than happy with 300hp and 400ftlbs. Any input?

[Conanski]

You will need a complete 5.8 EFI motor, nothing on the 5.0 will tranfer besides the throttlebody and injectors, water pump and timing cover. All other parts are unique to the 5.8. You don't need engine mounts though, both motors use the same. A 5.8 computer would work well as long as you select an SD friendly cam(see my sig), but also consider a MAF conversion using a mustang computer. 300hp won't be much problem if you can get away with headers of some type.

[BucksTrucks]

Headers wont be a problem if I can find some ca smog legal long tube headers. I might just run shorties with a new y pipe. I was hoping the upper intake would work, but that is no big deal really. Would I need to source all the EGR equipment also? I am going to try to stick with the speed density set up if I can, maybe score a lighting ecu?

[Conanski]

Well you got a manual so you have options for the ECU, an early 5.8 computer from a manual or C6 truck will work as would a later 5.8 truck computer as long as it's not for the E4OD.. that will throw codes when it doesn't see the tranny. The EGR valves are the same on both motors and you can use the 5.0 tube if you attach a fitting for it to one of the header tubes(the 5.8 intake isn't plumbed for internal EGR like the 5.0). Here's my 5.8 setup using the 5.0 tube. The fitting I welded on the header is just the female end cut off another tube. The stock 5.8 tube simple goes straight down to the front of the exhaust manifold so it's effectivelly the same thing.

BTW, the Comp cam in my sig is SD EFI friendly and a healthy upgrade from stock, combined with the GT40 heads and exhaust the motor will really come alive.. an easy 300hp.

[BucksTrucks]

Well I got my complete 351w. Its a 1989 vintage. And it came with a box full of wiring and smog parts, a throttle body and the like. Here are some pictures of what I ended up with. The guy got it at pick n pull and never used it. I gave 250 for all of it.

[andym]

Originally Posted by BucksTrucks

Headers wont be a problem if I can find some ca smog legal long tube headers.

Let me know if you find any information on this. Last I checked there were no smog-legal long tube 5.8L headers on the market.

I'm thinking of doing a similar build on my Bronco when the motor in it goes, whenever that is. A cam, GT40 heads, and a good exhaust are definitely in the plan, but I am probably going with a roller motor.

[BucksTrucks]

I just might end up with some shorties and a new y pipe. I havent and any luck with ca legal long tubes...

[BucksTrucks]

Finally got it on a stand today and started taking it apart. Got it down to a short block plus the balancer and timing cover. Couldn't find any oversize marks on the pistons. But the rods were punched with numbers. Do they come stock like this or has it been taken down before? I dont think I am going to spend the coin in new heads. Can I still expect decent power with the E7s? Is there any basic porting work a machine shop can do? What would I ask for? What cam would you reccomend for EFI 351?

[guitarnik]

i would say the bottom end has been cracked open before as i have never seen them marked from the factory. if you HAVE to a shop can port the E7s but there really designed for the 5.0 they just dont breathe. i would get some gt-40s or ive heard guys say the old ?D09?(i think thats the casting) heads are better than E7. im sure someone on here knows the castings better than me. crane cams 444232 cam is good but i dont know if you can stilll get them easily siince they closed their doors( wish theyed reopen) but comp has a good selection. just call them and talk to someone there and they can tell you exactly what will work and what you want.

[Conanski]

The Crane cam and E7's will work well with the stock computer and produce a very TQ heavy powerband, it's all over at 4500rpm but that works well in a truck and the amount of grunt available compared to the 5.0 will put a big greasy smirk on your face.

[BucksTrucks]

Heads are at the machine shop. Block and crank are going today. Going to run stock heads for the time being. The costs to have them worked on is nearly that of some good new heads. So for go fast pats im looking at the crane 444323 cam, some shortie headers to maintain smog equipment, and a new ignition set up. Should still provide decent power. I have a computer that came with the 351, is there any way to find out if it was for a C6 or a E40D?

[Conanski]

It's almost a 100% certainty it was a C6 in '89, but what is the box code off it anyway.. that's the 3 or 4 digit sequence in large letters on the EEC connector. Post a pic like this one of you can...

[BucksTrucks]

Ok here is a pic.

[BucksTrucks]

Engine will be at the machine shop in the morning. Time for me to start cleaning up all the parts I am going to be reusing. Whats that computer look like to you guys?

[Conanski]

I'm 99% sure that is a non-computer controlled EEC but I'll do some more checking.