Afternoon guys..just bought a set of efi manifolds from eBay for 75$. Didn't seem too bad as I don't have a whole lot of access to a salvage yard here. Was just wondering if I made a good choice. I hear that even though hedders are better for performance..that efi manifolds are still the way to go.

 

I'm a big fan of the EFI manifolds and wouldn't trade them for headers.

In the long run, though, it really depends on what you use the vehicle for. If it's your daily driver, I'd highly recommend the EFI manifolds. They're something Ford did a really good job on. Plus, they're made by Ford for that engine and that goes a long way.
(Mine's a DD and I drive it all year long in all weather conditions, on and off road, so I want something I don't have to fuss with.)

If you only put a couple thousand miles on it a year and you want all the performance you can get, headers are an obvious choice.

I would say, the leap in performance from the stock log manifold to the EFI manifolds is huge. The leap in performance from the EFI manifolds to the headers is small.

 

Thanks for the info I plan on driving it as much as possible haha now..do I have to have different bolts and everything before I swap? I am goin from stock log to the dual efi setup..

 

https://www.ford-trucks.com/forums/1...n-hedders.html

If you haven't done so, go through that thread paying attention to the information about heating the intake manifold.

 

You don't have to have different bolts, but it is recommended. Especially if yours are the originals. Bolts stretch over time, and the thick washers are springed steel (if you look, they're slightly concave, or at least they used to be), so if they're old, it'd be a good idea to replace them anyway. If you're replacing them, you might as well go with studs to make your job easier.

But, you may put the old bolts on and never notice a problem. They're not like head bolts where you're going to run into serious issues if the bolts aren't up to spec.

 

as for the bolts..the engine is completely rebuilt to stock specs and only has 48000 on it since the build. The bolts look good..but ill double check when I tear it down.

 

And the heating issue..I read about the heat plate and such for the offy..but I'm keeping stocck intake as of now. Would I make the same setup as I would the offy?

 

The heat plate is used because it's carbureted, not because it's a 4bbl intake. I'd recommend it.

 

I gotcha. So would I make it like I would the offy? With the bracket and the elbows to fit the hoses

 

It'd be exactly the same.

This is the same plate, I just reused it:

 

Now with the bolts to bolt it up..did u find a set or are there bolts that can be reused from the intake? I was doin some other research and ccaame across an old fordsix post by u when u first did the manifold swap. U said something about how the threads from stock to manifold egr were different?

 

Are you talking about bolting on the heat plate?
The back two bolts (the two that are visible) are holes that go all the way through, so any long bolt and nut will do. As for the front one, you'll need to match the thread on the stock one, but the stock bolt will be way too long, since it's meant to go all the way through the exhaust manifold, instead of just a 1/4" plate of steel.

If not, what bolts are you referring to?

 

You are correct in the bolts..and on the two that go through all the way....would I just cut off the excess? How about gaskets? Do people sell the gasket or do I need to make one?

 

I wouldn't bother cutting them off unless they're exceptionally long. They won't really get in the way of anything.

You'll have to make your own gasket. The stock gasket (which is readily available) is designed for hot exhaust, not pressurized (and wet) coolant. You can buy rolls of gasket maker for pretty cheap from most any autoparts store. Be sure its designed for coolant. Use a good sealant (also made for coolant applications) to seal it up.

The coolant is pretty pressurized so let it dry really well and set up before starting the engine or it'll come spraying out.

Another issue you may run into with the STOCK intake is the smog hole that goes through the intake. I don't have a picture of it unfortunately, but the Smog pump pumps air into a separate hole in the EGR spacer. That air goes through that heat chamber, and then into the exhaust manifold to mix with the exhaust. If you use the stock EGR spacer (even if you don't use an EGR), you can easily plug the hole in the spacer with a plug from a plumbing store.

 

Ok..gotcha on both ends lol the engine never had the pump on it or was already modified before I got my hands on it..but I will keep an eye out for this hole you speak of.