They show up fine for me too. 
Trackspec Hood Vent
Thread Starter
Max G’s
Joined: Nov 2008
Posts: 2,751
Likes: 79
From: Monroe OH
NCM Sinkhole Donor
Trackspec Hood Vent
I decided to add a hood vent to the 91 in hopes to decrease under hood pressure that creates front lift and provide better cooling for the engine by decreasing under hood temps. I researched and come across these Trackspec Hood Vents. I installed a T1 Hood Vent for the C5 Corvette. They work perfect for the C4 hood as well. Everything you need comes in the kit. However, I did use stainless button head bolts with nylon lock nuts instead of rivets.
Thread Starter
Max G’s
Joined: Nov 2008
Posts: 2,751
Likes: 79
From: Monroe OH
NCM Sinkhole Donor
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Le Mans Master
Joined: Aug 2015
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Likes: 1,993
From: St. Charles MO
I actually a rectangle opening in my hood in that same area. It was originally for a single-plane intake setup that is no longer on the car, so it's serving no purpose. I am contemplating patching it to make the hood look stock again, but this might another option.
Normally vents for this purpose are installed much further forward, and ideally the radiator's backside is ducted to the vent. But I'd be interested in some tufts being used on the OP's vents to determine if the air is really moving out from underneath the hood, vs back into the hood due to high pressure from the base of the windshield. Also, is there an option to attach this vet without rivets or bolts - i.e., bond it from underneath?
Normally vents for this purpose are installed much further forward, and ideally the radiator's backside is ducted to the vent. But I'd be interested in some tufts being used on the OP's vents to determine if the air is really moving out from underneath the hood, vs back into the hood due to high pressure from the base of the windshield. Also, is there an option to attach this vet without rivets or bolts - i.e., bond it from underneath?
Thread Starter
Max G’s
Joined: Nov 2008
Posts: 2,751
Likes: 79
From: Monroe OH
NCM Sinkhole Donor
Yes. It does help exhaust hot air out. The engine temps keep a little cooler than before. And after each run with engine off, you can put your hand a foot above the vent and feel heat coming out.
In reference to where the vent is located; it is located directly in the center of the engine. The vent is centered over cylinders 4/6 and 3/5.
Matthew- air at the base of the windshield will not stahl back under the hood due to the hood seal that prevents that from happening. That is a stock piece that I still have on the car.
In reference to where the vent is located; it is located directly in the center of the engine. The vent is centered over cylinders 4/6 and 3/5.
Matthew- air at the base of the windshield will not stahl back under the hood due to the hood seal that prevents that from happening. That is a stock piece that I still have on the car.
Le Mans Master
Joined: Aug 2015
Posts: 6,111
Likes: 1,993
From: St. Charles MO
One other question: what about rain? Is there any issue with rain coming in there when the car is just sitting still outside?
All of this is me just contemplating how to deal with the hole in my hood. I don't want it there, but I also don't want to deal with the body work required to properly patch and repaint it. Your vent idea might be a really good solution.
Thread Starter
Max G’s
Joined: Nov 2008
Posts: 2,751
Likes: 79
From: Monroe OH
NCM Sinkhole Donor
Gotcha. But to clarify, I was actually wondering if the high pressure at the base of the windshield migrates forward along the hood far enough to actually force air back through the vent you've installed in the hood. IOW, at high speed is the pressure under the hood higher than the pressure over it, such that the air is going out from under the hood rather than opposite? I am think it probably is, but would want to make sure. I might test this out on my own car soon just to see.
One other question: what about rain? Is there any issue with rain coming in there when the car is just sitting still outside?
All of this is me just contemplating how to deal with the hole in my hood. I don't want it there, but I also don't want to deal with the body work required to properly patch and repaint it. Your vent idea might be a really good solution.
One other question: what about rain? Is there any issue with rain coming in there when the car is just sitting still outside?
All of this is me just contemplating how to deal with the hole in my hood. I don't want it there, but I also don't want to deal with the body work required to properly patch and repaint it. Your vent idea might be a really good solution.