Hello again, I had numerous technical issues with my internet as well as some computer problems that kept me away from the internet. I also had some physical problems lately that altered my plans and ate up time. So anyway to the point. I recently bought a 1995 Ford F350 4x4 for parts. It has the 460 and the zf5 transmission which I wanted for my winter truck. I have been reading and from what I can tell and I don't remember the stamped numbers on the heads etc. but if what I read is correct the heads were different on the 95 models years and that those engines produced more hp and torque over the 87-91 model years. If this is correct I was thinking about using this engine's heads and intake manifold and of course performing an inspection to make sure the valves, guides, and seats are good and installing them on my 90 460. I also remember something that the OBDII system was on the 95 as well. If this is correct, would this system be better to place on my 90 as well? This way I could increase the hp and torque via computer rather than the OBDI and the EECIV non-tunable system?

 

I imagine I would need to change out the wire harness, the computer, as well as the throttle body. Can I still do the EGR delete then?

 

as a rule of thumb, 96 and up are obd2 and anything 95 and under is obd1.


that said, there are a myriad of reasons your 95 could be obd2, even though it is likely obd1. California trucks are typically the only anomalies, where you don't really know what you have without really investigating. someone could have swapped obd2 along the way for reasons of who knows what.


the best thing to do is to find the catch code on the computer itself, which you can then google and see exactly what it is. if you have a MAF sensor (super rare California 460 version) then you know its obd2.


later heads are better than earlier heads, but its marginal and im not exactly sure the years they switched, I believe it is 96. either heads respond well to porting despite one casting being considered to be better than the other.


unless you plan on a dyno tune, or a home tune, there is no advantage of obd2 over obd1...in fact its probably the other way around. if you have obd2 with mass air, and you mod it with long tubes, ported heads, etc, then you will be required to tune it. you can do whatever the hell you want to the old speed density and itll run great as long as you stick with a speed density friendly cam and make sure you aren't running around WOT for days while lean.

 

you cant "delete" the egr without causing issues. if youre obd2 (should figure that out sooner than later so we don't continue to talk about it if you don't) then you can tune the egr out and delete it altogether.


the easiest thing you can do to get rid of the egr is to block it off, your long tubes wont likely have the provision for egr so you only have to block it off at the intake. a "penny sized" piece of metal fits perfectly in the base of the egr to block it off. you need to leave the egr solenoid, sensor, and valve in-tact so the computer doesn't throw a fit. that also means that it needs to be maintained...but either way youll reap the benefits of not having egr even though its still mounted up.

 

... although a lot of '96 and '97 F-250s and F-350s seem to still be the old EEC-IV (often called OBD1) systems as well. Apparently the heavier duty trucks were exempt from the federal OBDII requirement, while at least the California trucks were switch over. I know my '97 F-250 460 is EEC-IV.

 

Yea the super duties were exempt, however even though 460 remained speed density they are largely obd2 post 95 model years. 96 and 97 do seem to be funky years where some are rolling obd1 from factory, which would not be compliant with the federal mandate for obd2.

 

No, I'm not talking about Super Duties (or Superduties). I'm talking about '96 - '97 F-250s and F-350s. From what I've heard on here it's pretty common for them to be EEC-IV, maybe even more common that OBDII. Ford couldn't have produced vehicles that didn't comply with a federal mandate, so clearly there was an exemption that the heavier pickups fit into.

 

My 95 F150 is an OBD I system. 96 saw the change over to OBD II. If I remember correctly it was a federal mandate that required ALL 96 up to have OBD II systems. I'm not aware of Ford or any manufacture that carried over beyond that with pickups Maybe the F450-750s. But I'm pretty sure all 96 3/4 & 1 tons had to be OBD II systems.

 

I thought that too until I bought a '97 F-250 that is EEC-IV. And then in threads on this board I found that a lot of others also have EEC-IV '96 and '97 F-250s and F-350s. So it turns out that I was wrong, all '96 and '97 3/4 and 1 tons did not need to be OBDII.

 

Ford never made an EEC-V OBDII 460. The 460 was unchanged for the last several years of production. The EPA allowed a waiver to remain OBDI if the vehicle was a carry over without changes. The 460 was one of these.

The 460 never advanced past EEC-IV OBDI.

 

So does that mean that the 351 is OBDII in '96 and '97 F-250s and F-350s?

 

No. The exemption was based on an 8500lb GVWR so any truck over that that was an unchanged carry over didn't get the OBD2 system regardless of engine. Ford had the all new superduty with the all new triton engines underway at the time and evidently didn't want to spend the $$ to make the old engines compliant in what would have been the last year of their production.
If you want an OBD2 5.0 or 5.8 you need to find a 1/2 ton, if there are any OBD2 460s they would have been a California model.

 

Thanks. That's what I thought about the 460. I was guessing the 351s would have been EEC-IV as well, but it's good to have that confirmed.

 

well, I wont go around saying that anymore lol.

 

No, it doesn't. The same thing applied to the 351. I didn't mention that because we were not talking about a 351 here.