The car is a 65 mustang coupe, the engine is 351w from a 1989 F350. The engine came complete with all the original fuel injection. The problem is the pickup truck intake manifold is bigger than Texas and wont fit under the hood. To get things up and running I put on a four barrel carb and intake, but I would like to run efi, just because. I want to, but I don't need to. The idea is to make it happen for hundreds, not thousands. So think craigslist and junkyard availability.
So what I have at my disposal is
A) The complete original injection
B) A 454 tbi setup
For the original is there any cheap intake options for me? I don't know of any 351ws being used in cars so I don't know where to look for a low profile intake. I know a 302 lower wont work, and I'm told that a 302 upper won't bolt to a 351 lower, so thats out.
For option B, the throttle body unit and carb adapter are taller than a carb by about an inch, and wont fit under the hood either with my edelbrock performer intake, maybe I could find a shorter carb intake and go this route with a mega squirt?
I'm sure there are other options I'm not thinking of, so feel free to throw them at me, because, you know, knowledge is power.
is there not an aftermarket carb-style intake with injector bungs in it that fits the stock fuel rails? then just put a throttle body in place of the carb and go
Yeah, there are not that many options for a FI intake on 5.8L based blocks. Certainly not low profile ones!
I think that an intake that will take the injectors and rails from the OEM FI system and a carb style throttle body is the way to go.
I was running an carbed 351W in my 68' Fairlane and I did a lot of research on converting to EFI. The best factory option would be the GT40 intake used on 94-96 Lightning pickup trucks. I have one in the basement that I could measure it you would like to know the height.
BC Broncos also sells an adapter to run a 5.0L upper intake manifold, but I think it may be a bit restrictive.
Doesn't pro-comp make a port efi intake for sbf? They are of reasonable quality and price.
It does look like I could pick an intake up for around $200. But the throttle bodies are around $400. That puts me at 600 without a pump or filter, plumbing, throttle cable, etc, etc. This could get expensive.
There are much cheaper throttle body options than that. Gm tbi with injector pod removed flows 600 cfm.
Dodge Magnum engines (5.2L/5.9L) have a very short throttle body that may work as well. They flow 635 cfm stock and can flow more when modified.
I have one of those and a four barrel adapter id le go pretty cheap. Think I got 75 in all of it....
Can't you use a 302 intake with spacers at the bottom to make up the extra deck height? I swear I read about this in some fast ford mag years ago.
Weren't 351w's available fuel injected in the early 90's? Any reason not to do that?
HiTempguy wrote:
Weren't 351w's available fuel injected in the early 90's? Any reason not to do that?
The factory 351W EFI manifold is pretty tall. Seems he has hood clearance issues. I'm thinking a Pro Products 351W manifold might be a good fit.
Dusterbd13 wrote:
There are much cheaper throttle body options than that. Gm tbi with injector pod removed flows 600 cfm.
Right, I actually have a tbi from a 454. If it will fit under the hood I would probably just use it along with a megasquirt for my injection.
81cpcamaro wrote:
Dodge Magnum engines (5.2L/5.9L) have a very short throttle body that may work as well. They flow 635 cfm stock and can flow more when modified.
I forgot about those. That may make a good option. When I get time I will look into this.
NOHOME
UberDork
8/12/15 2:26 p.m.
These things are available on E-bay for about $1000. Hard to believe and I am sure it is cheap China E36 M3, but still
No idea how I would control it since I am not fluent in MS, but I would almost be happy with the car as a static display if this was on the engine.
http://www.ebay.com/itm/Ford-SB-260-289-302-Windsor-Down-Draft-EFI-Stack-Intake-Manifold-System-Complete-/181680745781
In reply to NOHOME:
I saw those. Super sexy. Yeah i would rock that setup. But the buy in is a little steep for me right now.
they make spacers too use a short deck (302) intake on a tall deck windsor. a set of the spacers and a junkyard foxbody fuel injection system seems like the easy route.
Lower profile intake manifold and 454 unit?
ITB's suck so do TBI's, I'm not sure which sucks worse. Probably ITB's because there are so many hurdles to clear.
The big issue with TBI's is fuel distribution is random and there is too much wetted surface it's hard to make work well (too many compromises and bandaids). Plus wet airflow is more difficult than dry consider the weight difference for starters.
ITB's are an engineering nightmare and are a vintage racer throwback. You won't see anything fast produced today with them. Two major engineering hurdles, very difficult to idle and throttle opens so fast it is difficult to modulate smoothly for street use. A butterfly in the port causes up to a 20% reduction in air flow and disturbs any intake tuning benefit you might realize by speeding up then slowing down the air in the port this pretty much puts the brakes on any goodness a long runner intake tract provides.
Port injection is the way to go use what ever throttle air valve you want. Squirt the fuel right at the back of the intake valve.
