I have a 1987 f-150 with the 302 fuel injection it using a lot of oil so I plan on building another engine the ? my truck is not a h.o. but what if I put one in it what all is involved I know the firing order is different so prob. need to change dist. but what about computer will the one I have work and as far as roller cam what grind to use;( close to stock) anything else I am forgeting let me know

 

You are correct with the different firing order. Your stock speed density computer should work as long as you dont go to agressive on your cam upgrade. Those computers are really funny about non-stock parts. Cant really put many mods w/out the computer going crazy.

 

Hey man I'm in the same boat as you, but I've got a 351 I'm thinking about rebuilding and sticking in there instead.

 

If yours isn't an HO, your computer won't work. You will need and EEC(computer), swap firing order with HO cam, and 19# injectors for an HO swap. Being an 87 you may be able to use an 86-88 mustang EEC if you plan on runnign speed density. Don't know all the details on the computer swaps, might want to do a search for info..

 

yea I was going pretty much stock so what is the specs on a stock roller;who knows may even reuse the one in the other short block it should not be hurt it's a roller they last for ever

 

I have a few computers out of mustangs laying around so changing that is no big deal what else is their to change ;coil maybe

 

the firing order does not matter - unless you have the wires routed wrong.

with s/d and 1-5-4 you use bank firing which mis-times 6 injectors, going to mass air and SFI, but staying 1-5-4 mis times 4 injectors.

to get 100% in time, you use SFI mass air (the A51 or T51 truck kit) and cam to the windsor/gt/ho/marine (whatever u want to call it) firing order and route the plugs.

Is there a mass air sfi 1-5-4 computer? dunno, not without my books)

most of you have mistimed 6 injectors all of your lives.

 

not being rude but you lost me

 

your 1987 uses a speed density computer with bank firing injectors. It fires each bank (4 at a time) at once.

therefore, only 2 injectors are timed to fire at the right time. (bank 1 fires with cylinder 1, bank 2 with cylinder 5)

changing to 1 3 6 firing changes nothing, 6 injectors are still mis-timed, meaning the fuel is sprayed in nearly randomly.

ALL ford speed density trucks are like this.

Mass air now....they can use SFI - sequential firing order. But to my knowledge all the mass air ECMs are 136 firing. So if you use one on a 154 cammed engine, you now have 4 injectors properly timed, 4 not. meaning - its not that big of a deal. However, if you do put mass air on a 154 and re-cam it to 136, it idles like silk.

 

The SD EFI systems in these trucks uses batch firing for the injectors, number #1,4,5,8 are all fired together, and #2,3,6,7 are all fired together. It doesn't matter what firing order the engine is designed around, the HO/351 or non-HO 5.0, this same injection system runs both motors. What does matter are the actual cam specs, the SD computer relies heavily on a steady vacuum signal, so the cam must provide good vacuum. That means nothing over 216 degrees intake duration at 50 thou, and in most cases nothing less than 114 deg lobe seperation angle. Some 112 LSA cams will also work, but they are typically the very short duration grinds. Cam lift is not a major concern, there are cams that produce over 0.500" lift at the valve that are SD compatable, just for comparison the stock non-HO 5.0 cam produces less than 0.400" lift at the valve.

The 5.0HO cam is a pretty good all around power producer, but the 5.0 is weak at low rpms and there isn't a lot you can do about that. 300 cubic inches only produces enough so much TQ, and trucks are heavy, so it will never move one with authority unless it's geared and has a high stall converter. The #1 mistake I see made made by people upgrading the 5.0 for a truck is going all out for big HP numbers. It's no problem to get over 300hp from the motor, but it usually kills performance under 3000rpm. If you are looking for grunt to spin big mud tires or haul a trailer get a 351 to build up or go all out for a big block.

 

Don't the non-HO motors use 14# injectors & the 154?? Just wondering,,,, when doing an HO swap on an 88 t-bird had to swap injectors along with cam, EEC(sd) and changed firing order the 13726548 order.


But using a non-HO EEC and HO motor gonna make any difference? Timimg and fuel curves are different between the 2 computers.

 

The truck 302s used 19 lb/hr injectors, so no need to change them. Several car 302s did use 14 lb/hr injectors, though, and may have featured sequential injection as well. Swapping to a mustang computer requires additional wiring to be added to the harness, regardless of whether it is speed density or mass air, there's just less to be added with a SD mustang computer. They are both sequential injected, while the truck wiring is set up for batch injection. The easiest route is what Paul (Conaski) suggested with finding a good cam and using the stock truck computer. A gain will still be noticed, maybe just not as much as if the HO engine were running on a mustang computer.

 

Thanks for the info.. Been doing mustangs for years and don't know as much about the differences in the f-150's yet.