I believe the 5 mph Gov mandate did have a minimum height.
This doesn’t explain the chrome bumper ones though LOL! But those are strictly the fault of the builder/restorer….

Jebby

 

I hope that it is okay to answer? Nascar drivers experienced horrible car lift at the super speedways once the car started to get sideways. Cars would lift off the track, fly through the air, and to many rolls. So the idea of Roof spoilers came into effect. I've driven at Bonneville many times over the years and worked as pit crews. The salt flats are like cement with sand on it. traction is a real problem. Like the car Speed Demon couldn't even go full power in 6th gear until 380 mph and they actually took out 600 hp and it went faster when they set the record at 420 mph or something for the fastest piston car ever.

I would have needed to add 1200 pounds in the passenger seat of my vette because I was spinning my tires going WOT at over 170. I had to back off and ease into it.

Anyway, lots of cars at Bonneville 360 loop the car before the first mile or two markers while trying to accelerate and the roof spoilers keep your car on the ground instead of rolling.

It's also the hard to see clear Lexan or some material behind the driver side door all the way to the rear deck spoiler. air keeps the car flat if it is sideways

 

I was hoping to TQ my way through a high 12 sec quarter.
Some years ago we got into a long thread on aeros.
Supposedly the Lemans Vettes were doing 200 plus on 600 hp?

 

A car that runs at. Lemans and a car running on a drag strip are 2 different animals.

 

I would like to have a car that can do a 12 sec quarter and and an honest 160 mph?
I think another 50 rwhp should do it? lol

 

Every car is different, but my engine makes similar power as yours(326rwtq, 294rwhp) and I was unable to get into the 12s. Mid 13s was the best I could get out of several runs.
I added a 125 shot NOS and I was able to get high 12s.
there are so many things that can impact a 1/4 mile time, cars weight, what tires your running. I have a TH400 and I know I could get a way better time if I had a high stall converter.

 

I have a 3.36 rear end and My Corvette with it's 427 gets really light in the front at 120+ mph. I liked making runs on the Runway of a local airport, 2665' of smooth asphalt with a lot of run off room and grass on all sides. The sound of a Big Block howling at 6000 rpm through it's headers is a sound that is dear to my ears. I kept my Cessna 172 there and would take it flying afterwards, the only problem is my 172 did not accelerate like my Corvette. The Cessna 172 had a real issue with "lifting off" at 60 mph all by itself. The only thing that accelerated like my C3 was a Pitts Special on takeoff.....

The 427 I am using is a copy of the L88 without the aluminum heads. I have 12.25-1 Compression ratio and this engine makes a good bit of power.
I have only been to the 1/4 mile track once and the Corvette would turn 13.0's times all day long at 120+ mph. I believe it would drop down to the 11's in cooler weather. The day we were at the track it was 100* ambient and the track temperature was HOT. The Track safety people were doing their job and since I don't have a roll cage I was told to stay above 13.0 or get led off the track. I hit 13.05 a couple times that afternoon. I have a Gtech Pro that allows me to see if any changes either add power or take it away. It says I am able to get into the car to accelerate into low 11 second 1/4's, I frequently test the car doing roll-on's to verify any power gains. It is a great tool to keep in your tool box. You can test your Corvette without getting arrested and that is important to me.

Next time I go to a track I am putting the Hard top on before I go. I will also tighten up the bolts on the rear spring and that will push the nose down a bit. With the rear Spring bolts tightened the rear will come up and the nose will drop a little.

 

what will she do? probably kill you if you give her the chance...

 

This is sooooooooo true! It was one of the best days I've ever had.

 

With some brake and suspension upgrades the C3 can be a very competitive high speed vehicle. My 68 has Ridetech front and rear suspension with coil over shocks, Willwood 4 wheel disk brakes and upgraded steering box. The car has been 195 mph plus in mile events numerous times and over 140 mph in the 1/4 mile. The car is truly rock solid at speed with absolutely no bad habits.

 

13.2

 

305 RWHP in a 3400 pound car has the capability of mid- to low-13's if you can get it to hook up well, with no tire spin, for a low 60-foot. That 3.55 rear with only 330 torque will not produce a rocket launch, so you're likely to see ETs in the high 13's at about 110 mph. Add your own weight and some gas to the weight of the car, and times will be slower.

For top speed, assuming you have an engine that will peak out horsepower at 5500 rpm, a 1:1 top gear tranny drive ratio, and 26 inch diameter tires, your top speed is 120 mph. If you can spin the engine to 6000 and still make power, your top speed is 130. For you to go 160 with your 26 inch tires, 3.55 rear end, and a 1:1 tranny top gear, you have to make power at, and spin your engine to, 7500 rpm.

Simple math.

 

One thing that I did very early on in the life of my 79 with 3.55 gears was to install a manual/auto valve body with rock hard shifts and no internal slippage. That alone decreases drag racing times. I also bought wheels with Goodyear slicks just for drag race days.

Math is your friend!