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A couple questions, some of the guys on ebay are advertising GT 40 intakes for mustangs and explorers. My question now - is there a difference between a truck GT 40 intake and the mustang GT40 ?
There is only one* GT40 intake and it was only factory installed on the Lightning and Cobra Mustang but it'll fit on any 5.0 motor, but that's not to say it would fit under a stock hood on some of those vehicles.
Originally Posted by JRS2
Also if a stock explorer manifold or stock ford manifold how do I tell the difference between that and the gt 40, markings on the castings ?
Yes casting numbers will tell the story, differences will only be in the upper portion though with the versions made for the cars and Explorer being squashed down a little more for hood clearance which is why they don't flow as well as a full GT40.
* Actually that is a bit of a lie there are two GT40 intakes, one has a cast aluminum upper and the other has a welded tubular upper, but both flow pretty much the same and both use the same lower portion.
Ok, thks for this info. If I go with the Gt 40 truck intake it will have a single TB as opposed to my stock dual setup. I will need to go with a new computer for the 5 spd as this will be the 351 rather than stock 302. Will I have many other wiring issues with for instance the TPS being different on the single TB setup ? For now I have the speed density on this truck, hope to stick with this initially. Plan now is for the gt 40p heads, slight upgraded cam, long tubes and maybe 2.5 inch exhaust. I need to keep decent highway mpg .... so any other suggestions ?
The tubular GT40 upper intake, for the 5.0L engines, was an over-the-parts counter item made available by Ford Motorsport in the Spring of 1991. The tubular GT40 upper/lower intake wasn't factory installed on the production 5.0L Mustangs. --the 5.0L GT40 lower intake is the same as the lower intake for a '93 Cobra Mustang. --only the '95 5.8L Cobras got the GT40 tubular upper intakes and corresponding lowers, as well as the 5.8L '93-'95 F150 Lightnings.
When the 5.0L Cobra Mustang came out in 1993, it received the cast aluminum Cobra upper intake and the corresponding lower intake to match (the Cobra upper and lower intakes were different from the regular production 5.0L LX and GT upper and lower intakes).
Here is a Ford Motorsport parts catalog I have from 1991.
You can see the listing for the GT40 tubular upper intake/lower intake on this page (notice the release date of availability of the GT40 intakes --" Available: Spring (1991)."
On the left is a 5.0L Cobra lower intake I have and on the right is a 5.8L Lightning lower intake. --I also have a factory 5.8L GT40/Lightning lower intake that's cast iron. It was for a marine application.
5.0L Cobra upper intake on the left, GT40 tubular upper intake on the right. --someone had powder coated the GT40 intake in blue then, powder coated over that in black. I'm in the process of removing the powder coat back down to the bare aluminum, to refinish the tubular upper intake. These upper intakes are interchangeable between either of the lower intakes pictured above.
5.8 truck intake manifold with 5.0 mustang upper pluenum CAN be done.
Conanski. I have been reading these FT forums and it is clear that you know facts and not heresay. Kudos to you. I have a '71 Bronco and I just picked up a '92 5.8 from an F350. Off came the tall upper with dual TB (not sure the overall mm of that TB). I'm installing a 5.0 upper plenum to the 5.8 lower. Adapter is available from Chuck at BC Broncos for a mere $122. It adapts 5.8 truck lower manifold with oval ports, to mount a lower profile 5.0 upper with rounded oval ports. B.C. Broncos - Early Bronco EFI Fuel Parts and Kits - B. C. Broncos llc - products new home - manifold adaptor 351/5.0
It looks like 5.0 upper has EG pass thru block and plenum to EGR, so I have 3D designed an adapter block to bolt the 5.8 EGR (w pipe) to a 5.0 EGR spacer, so I can create a modified external EGR tube from headers. I'm keeping the EGR for cruise mpg. Not using the air pump and cat.
Since I drive off road and need low rpm torque. I bought an '86 mustang TB and it seems to measure about 53 mm rear opening. When you say stock Mustang is 60 mm, is that '87-93 60 mm, does that exclude the '86 which seems to be smaller?
When you say stock Mustang is 60 mm, is that '87-93 60 mm, does that exclude the '86 which seems to be smaller?
Yes.........'86 used the crappier small TB/upper intake as do the vic/marquis/townies, the heads are also junk on 86 HO's and all box cars.........87-93 HO's got the "larger" upper/tb combo.........
"Broncos has come up with an adapter that will allow you to use the 351w lower truck manifold and the car 5.0 HO upper manifold. This will allow you to put a 351W with EFI under a stock steel hood in your Bronco. comes with two gaskets and all necessary hardware. This is a true bolt-on fix for your hood and firewall clearance problems. Plus you may gain a little horsepower."
The above quote was the advertising for the product. The pic shows the 95 or 96 upper, I believe, mustang or truck ? Seems to me the discussions indicated the trucks had longer runners and were preferred, unless you have clearance problems for instance in a mustang. Note that Bronco's is not saying you will gain performance, but you may.
So the question might be this, it has been suggested that the 302 intake combo flows better than the 351, has it been determined what is the weak point in the 351 combo, the upper or the lower ?
It's the lower portion as it is with most Ford intake, the runners are small and are kinked pretty badly so no there won't be any power gains with a mustang upper on it. The 5.8 truck upper isn't as good as the 5.0 version but it's still better flowing than anything that was mounted on any of those cars, and those dual 51mm throttlebodys are equivalent to a 70mm single.
The 5.8 fits under a Bronco hood with a 5.0 upper. Since the 5.8 dual is equivalent to a 70 mm, should I start with a 65 mm Explorer TB I have available?
It's the lower portion as it is with most Ford intake, the runners are small and are kinked pretty badly so no there won't be any power gains with a mustang upper on it. The 5.8 truck upper isn't as good as the 5.0 version but it's still better flowing than anything that was mounted on any of those cars, and those dual 51mm throttlebodys are equivalent to a 70mm single.
Ok that helps. Wonder what your opinion of the following intakes:
Qualifier series and Professional products (lower 54126 for instance) ? I located an Edelbrock 3880 but also found your discussion back in 2006 I believe indicating only OK for a stock motor.
Bronco Bear sounds like he is still trying to make the stock 351 lower work, it might depend on the budget and any other mods going in or planned for the motor ?
JRS2, to clarify, I know it will fit and go together. I'm just not sure which TB to use. I want to keep EGR for cruise mpg. The 5.0 and 5.8 EGR mounting bolt distance (on EGR plates) are different. I designed an adapter plate in 3D using SolidWorks. I'll print out the drawings and get it machined. It will allow me to use the 5.8 f-series EGR valve that has the threaded entry for the exhaust tube from header.
Since the '92 F350 5.8 dual TB is 70 mm, will an Explorer 65 mm TB be enough to keep the air velocity up for torque, or do I need to match 70 mm?
If the Explorer 65 mm TB is not large enough for the 5.8, is there a Ford factory 70 mm single TB that would work, so I can avoid the cost of a BBK 70 mm?
It's the lower portion as it is with most Ford intake, the runners are small and are kinked pretty badly so no there won't be any power gains with a mustang upper on it. The 5.8 truck upper isn't as good as the 5.0 version but it's still better flowing than anything that was mounted on any of those cars, and those dual 51mm throttlebodys are equivalent to a 70mm single.
This is for Bronco Bear's last post:
Conanski indicated the bottleneck is the lower 5.8 manifold for the most part with a slight performance nod in the 5.0 upper compared to the 5.8 upper. The questions you are asking are modifying the 5.0 to work with the stock 5.8 lower, correct ? If so is it worth going thru all the modifications to the upper to make it work with a not great 5.8 lower (as compared to using the stock 5.8) upper ?
The other option is to find a better 5.8 lower and go from there, I am in the same situation .... what I am considering at the moment is going with a better 5.0 upper and lower and machining an adapter between the lower and each head rather than spending $ 320 with an identified part supplier for this. Other options are Edelbrock or others mentioned previously ....
One more question for Conanski or whoever might know. The stock 302 intakes that are supposed to be decent and referred to in the comparison chart earlier, what years are those, or put another way how do flow characteristics of the truck 302s compare, say from 92 93 94 95 96 and 97 ? I believe 92 to about 95 on the outside was similar, believe 96 and 97 or so are similar before changing again in 98 or 99 ?
In other words is it worth searching for a particular year ?
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