EFI modifications

Can anything be done to improve the performance of a 460 EFI truck engine? how much power could be made with a max effort EFI engine? It would be used for stock class truck pulling competitions and would not need to be street drivable.

scotty (mad porter) has done some intake and head stuff
for the efi's
what are you head cast #'s

you can use a msd box and a squirt box fuel injector controller i have done one of theses with an stock style lsx brand x motor and a 76 mm turbo and works great

cant use the msd or a squrit box what ever that is?
for stock class
here are the rules for his class

1. Motor must match pickup make.

2. OEM fuel systems only. Only one carb permitted. Carburetor must be a single line feed type carburetor with vacuum secondaries. No double pump type carburetors. The carb spacer/adapter must be 1 inch or less. The fuel line must not split before the carburetor to feed fuel to the front fuel bowl and the rear fuel bow. Factory EFI systems allowed, OEM cast iron heads only. May have a secondary tank located in the box and securely fastened down. Motor must match pickup make.

3. Vehicle must have front and rear bumper. May run weight bar.

4. No solid or blocked suspension or ladder bars. Must be on springs. Lift kits allowed. Must use stock frame and running gear. No blocked suspension or tie downs or clamping of springs allowed. Spring shackles must not be restricted in any manor. This includes welding the spring shackles or any other method of restricting them. Spring shackles must be in the original position as intended by the manufacturer.

5. Must pull from factory hitch or Reese type hitch.

6. No class jumping allowed.

7. 480 + 2% cubic inch limit*. “Cast In – Cast Out” (cast iron intake, OEM exhaust manifolds, and etc). Trucks that come with factory aluminum intakes or composite intakes are allowed for that year of make and model only. The truck must retain full factory interior, driveline, and the rest of factory components except factory gas tank.

* An exception to this rule is if vehicle was originally equipped with a GM 8.1 liter, Dodge 8.0 liter engine, or any truck that is manufactured with an engine greater than 480 cu in. will be allowed.

8. Illegal fuels: E-85, all forms of nitromethane (including nitrous oxide & propylene) or alcohol as a fuel or fuel additive for pulling. Must run gasoline. The only exception is flex fuel vehicles.

9. Vehicles exhaust must exit behind the cab with muffler(s) and have a 3” diameter max. Dual exhaust is allowed.

10. Vehicle must have DOT approved tires, no larger than 33 inch. Siping allowed.



11. All flatbed trucks must be a minimum of a 1 ton cab and chassis series pickup

I'd say that all that you could do is port the heads and maybe up the cam within the specs allowed by the ECM. If it were me, I'd upgrade to a set of DOVE or DOOE heads and run a carb on it, with a set of the truck ex manifolds.

from the research iv'e done so far the only way to get it to run right would be with a aftermarket EFI controller and MSD box. the rules don't exactly say OEM ignition systems must be used....

jesse wrote:scotty (mad porter) has done some intake and head stuff
for the efi's
what are you head cast #'s

I cant see the casting number. do you know where its at?

I think on the later model stuff it's under the valve cover.

schmitty wrote:I think on the later model stuff it's under the valve cover.

yes

i had a set of efi heads awhile back the cast# was on top the exh side
just like anyother 460 head
mine were f3te
i am suprised more company's done have parts for the efi stuff?

the cast numbers are on top the exhaust port, just didnt look hard enough the first time. they are F3TE.

The "fuel system" would be STOCK, it is just that the computor and electronics wouldn't be. I don't see any reference to that specific thing in your rules.

In my opinion those rules have a lot of holes . . .

What exactly constitutes a "Factory EFI System"?? As long as everything on the engine is factory can you use an aftermarket ECU?

Like someone said, it sounds like earlier cast iron heads would the hot ticket. Port match the FI intake to match.
Run LOTS of compression a decent cam. Q16 would have to be the fuel of choice.

gryphon68 wrote:In my opinion those rules have a lot of holes . . .

What exactly constitutes a "Factory EFI System"?? As long as everything on the engine is factory can you use an aftermarket ECU?

Like someone said, it sounds like earlier cast iron heads would the hot ticket. Port match the FI intake to match.
Run LOTS of compression a decent cam. Q16 would have to be the fuel of choice.

EFI intakes wont work with earlier heads so if he uses factory FI he has to use fuelie heads.
EDIT: Intake not Heads

why is that?^^^^^^^^^^

whatbumper wrote:why is that?^^^^^^^^^^

Different location of the manifold bolt holes.

So, the intake bolt pattern is totally different? I am just trying to learn this stuff so take it easy.

I know small block stuff. That's why I am here is to learn the big block stuff.

Yes intake is different, and I believe the exhaust is raised and therefore different also. All early non EFI heads will interchange, but both versions of the EFI heads are on their own, E7TE and F3TE. I don't know that anyone has a method of adapting a carb manifold to the fuelie heads yet.

schmitty wrote:Yes intake is different, and I believe the exhaust is raised and therefore different also. All early non EFI heads will interchange, but both versions of the EFI heads are on their own, E7TE and F3TE. I don't know that anyone has a method of adapting a carb manifold to the fuelie heads yet.

I have seen where someone, dont remember who, either sells or knows who sells adaptors on here or the other site.

95lightiningguy wrote:

schmitty wrote:Yes intake is different, and I believe the exhaust is raised and therefore different also. All early non EFI heads will interchange, but both versions of the EFI heads are on their own, E7TE and F3TE. I don't know that anyone has a method of adapting a carb manifold to the fuelie heads yet.

I have seen where someone, dont remember who, either sells or knows who sells adaptors on here or the other site.

I thank thats just an adaptor to put a carb on the efi intake

Price motorsports makes an adapters to put a carb on the EFI intake, they also make an adapter to put a older carb intake on the EFI heads. what would be the advantages of doing this? could the EFI heads and intake with a carb make as much power as the old stuff?
http://www.pricemotorsport.com/

You learn something new everyday.

If he has to run a cast iron intake what is the best one out there if he wanted to run a carbed combo? Also what kind of flow are guys getting out of cast iron exhaust manifolds.

whatbumper wrote:You learn something new everyday.

If he has to run a cast iron intake what is the best one out there if he wanted to run a carbed combo? Also what kind of play are guys getting out of cast iron exhaust manifolds.

I think the top trucks in my class are 550+ hp

I have seen a couple of people use the 5.0 mass air ECU stuff somehow. Not sure exactly how they do it but it is OEM stuff.

I would talk to someone from sct or similar and see if they could burn a chip for your specific upgrades.