Hey.. that's a 5.8 GT40 lower you have there isn't it? They're hard to find.

I remember reading about port shape one time and it was determined through flow testing that a rectangular runner can flow more air than than any other shape of similar size. I guess that's why most engines use rectangular ports these days, if it flow more air it'll make more power.

 

They are kind hard to find, I got it on Ebay, through some guy who's also on nloc.net. The auction listing said it was in excellent condition but just yesterday , when taking those photos, I noticed cracks at both front injector bosses going through to their respective nearby water jackets. Truly sucks when people aren't honest about/don't really know the condition of what they're selling. Now, I have an expensive paperweight until I either have it welded or sell it as the slightly damaged manifold it is.

Glad to hear that rectangular ports flow better, I've put a fair amount of work into smoothing out/opening up both upper and lower for better N/A power. I only bought the gt40 lower to bolt up to some kenne bell inlet pieces I have but I may just modify the supercharger discharge manifold bottom to hook up to a performer lower.

 

Okay.........bringing this thread back from the DEAD! I have a 95 Bronco, with the 5.8, and I've already got Flowmaster exhaust, and the bigger K & N cold air intake. Would it still be a complete waste of money, and time to add the TBS to this setup? I'm running 35's, and realize that stock gears have the deck stacked against me, but with as little use the Bronco will see, I can't justify that huge cost. Waste, or worth it for Throttle Body spacer? Thanks

 

6 years later the answer remains the same...a throttlebody spacer is a complete waste of time and money. The same can be said for that K&N hot air intake.

 

Yes Randy but they look sooooo cool

 

I guess I will take your advice with a grain of salt. K & N's on diesel's are a bad idea, but it is a very good upgrade for any gas engine. Better filtration, air flow increased by 30x......yea, I'll keep my "hot air" intake as you call it

 

More air into a motor is good or maybe not so good if it's hot, but that isn't even the big problem with oiled filters. The big problem is the oil usually leads to mass air meter contamination and failure(on MAF equipped vehicles).. which your '95 should be.

 

And it doesnt matter how much air you can get into an engine if it wont exhaust it. Back to basics. An internal combustion engine is an air pump. No more in than can go out. Hasnt changed in 120+ years.Probably never will.

 

Well the K & N filter, is the large one. It is not specifically a "cold air" intake, but it does sit directly in the factory box, which is constantly having fresh outside air fed to it, the same way the factory filter is. And Conanski, you are absolutely right, K & N's are often OVER oiled.....I've learned to use it sparingly, the trick is to get it completely clean with mild soap, and dry it all the way, before oiling. The engine is getting plenty of airflow. I just added 3" exhaust into a Flowmaster muffler.....the difference was noticeable right away.

 

My main question was about the TBS, and was hoping, it would be a decent mod, to add on top of existing ones. That isn't the case........I'll save my pennies

 

These spacers were originally developed for carbed engines where just about anything has an effect on fuel atomization in the intake plenum, so some smart marketing types thought.. if we can sell it for carbs why can't we sell it for EFI? Well turns out they can sell them but unlike a carbed motor they make absolutely no difference to fuel atomization on a multi-port EFI motor because the injectors fire at the back of the intake valves in the heads and the TB is 17-24 inches away at the opposite end of dry intake runners.

 

So this is not the full blown K&N intake kit? If not, then you are golden. I have used a K&N drop-in filter to replace the factory paper filter many times. While I have used the full K&N kit on a few Mustangs, I do not like the design they use for these OBS trucks hence the reason for the "hot-air intake" reference.

 

No, mine is the full kit. It is not sealed like the drop in filter type, but the amount of air that flows is wayyyyy more.