Hi, I have a 1992 Ford F-250 4x4 w/ a 5.8 manual. I'm getting ready to swap out the engine with a 1994 408 stroker that will have a slightly overstock cam, a set of 185 cc intake runner heads with 2.02 intake valves, the block deck is getting a .010 shave to push it to right at 10.5:1 compression, it's going to have an Edelbrock performer truck intake, I'm swapping the brain for a 1994 brain and adding mass air to it, and then I'm going to be swapping out the ignition components for a full MSD system and tuning the brain with a Moates Quarterhorse. What I need help with is the fuel setup. I'm needing to know if a stock fuel pump will handle it or am I going to have to go larger and I'm needing to know what size injectors that I'll need to feed that much air. I'm thinking that the Quarterhorse can tune the injectors down to an extent if the injectors are more than what I need and I want to be sure to get large enough injectors but I also don't want crazy too big either. I won't have access to a dyno, but in my opinion with that much airflow, compression, the MSD ignition, the brain tuner, and the right fuel flow I think that it should have about 1hp and 1ft lb of torque per ci, but that may be wishful thinking too. I just know that I want to make sure that it's not lean on fuel anywhere in it's rpm operating range yet I don't want it drowning in gas either. Even though I'm not overly concerned about fuel mileage (or else I wouldn't be putting a 408 stroker in my 3/4 ton 4x4), but I still drive this truck a couple times a week, so I want as much power as I can get with out having to pay midgets to ride under the hood dumping gas in it. Oh, 1 other thing, my truck is a manual, ZFS542 5 speed to be exact, but my 1994 mass air brain that I have came out of an automatic, so, does anyone with experience with this see a problem with using it? If I'm thinking right I should be able to use the auto brain on a manual but you can't use a manual brain on an automatic, but if someone could verify this for me I'd really appreciate it. Any sound advice will be appreciated. Thanks in advance.

 

I'm going to suggest you look for a different intake. Even the standard Performer would be a better choice but something bigger again wouldn't be a terrible idea either. The runners on the truck version are just way too long and they will strangle this motor badly. I have no first hand experience with this intake but I was around when a couple other members built strokers some years ago and remember what they went trough with this intake, they both ended up changing it for a TrickFlow TFS-R.

What kind of pistons come with that stroker, are they domed? I'm curious how you end up with 10.5 compression.

You will need a better fuel pump, this should do the trick.. HFP 255LPH Fuel Pump Assembly *Front Tank* Ford F150 1990 - 1997

What cam have you selected?

You'll need bigger Injectors too but that depends on how much HP the motor makes. With that truck intake it won't make any more than 300hp so 24lb injectors would work but with something better it could be a 400+ hp motor which would require 36lb.

Is that a truck PCM or a car? With a manual trans you could use a Mustang PCM which is guaranteed to be supported by aftermarket tuners, a truck PCM isn't guaranteed. Tuning with a moates you can change all the parameters for the injectors and the MAF meter so you will need the transfer data for the meter.. that is a plot of it's flow rate referenced to output voltage. You do have control over everything with the tuner but I don't know if you can turn off the auto transmission functions in a truck PCM.

 

As mentioned, which computer do you plan on using, and which mass-air flow sensor?

As mentioned, at 400 HP, you're going to need around 36 lb-hr injectors - and that will be just about at their limit. If you want headroom, I recommend just getting the Siemens-Deka 60 lb-hr injectors. They don't cost any more than the 36 lb-hr injectors.