Air dam for higher top speed
 

I'm trying to squeeze other 15 mph top end speed out of my 67 Impala SS. The steering starts feeling a little light before the car reaches the top speed its geared for. I wanted to keep the stock(ish) look of the front so I made this air dam for the car out of 0.125" aluminum. Its mounted about 4" behind the bottom of the bumper, following the contour, and about 4" off the ground and a 10 degree forward (at the bottom) angle, painted flat black. I haven't had the opportunity to try it out yet, any input on this project would be appreciated.

God, I like that! Can you provide any more specs? Or make me one! Please post back on the results.

That looks good. you should be able to feel a difference with that. For testing, it would be great to take photos at freeway speeds or a little higher with and without the spoiler. A 3/4 front view or side view would be a good angle to judge front lift. If your front springs are stock rate, that allows more lift, and stiffer coils will lift less.

After hours of research, I found that the vertical angle of this design air dam is wrong. It should be at a right angle to the ground for the most downforce. Anyway, there is a very noticeable difference at speed......Good idea about photos at freeway speed. When I pull the air dam off to adjust the angle, I'll do before and after video with the gopro. I'll post pic and specs when its dialed in

67 Impala SS air dam
 

I never did get a chance to do further testing as far as lift results on the air dam, traffic conditions weren't clear enough every time that I had time to test.
Anyway, The top speed increased to 153 mph at 5200 rpm and the steering feels solid so I would say it is an improvement. Also in side winds the car hardly moves at all now.
Nevada Open Road Challenge in two weeks! I'm there! Grand Touring division, 125 mph class

Nice work! And good luck and report back on the event. :thumbsup:

:goggles: watch that bro, I got babies on the roads.

Vince, no worries. I got babys on the road also. Testing is only done when its safe for the public, usually sometime between 3 and 5 am, ZERO traffic.

Nevada Open Road Challenge
 

Got back a couple weeks ago from the Nevada Open Road Challenge!! The air dam worked well, what I really noticed was that high side winds didn't blow the car around at all, freeway speeds or above. Got a youtube video, the car is going about 130+ in this section, looks like zero lift. Its about 5.18 minutes in
https://www.youtube.com/watch?v=gnonMz2W-2A
1700 mile round trip, car ran great! Ran in the Grand Touring class, 125 target, 140 mph tech speed. Great time! Great people! Got two out of three awards. Car show, most unique vehicle (not sure how to take that). King of The Road, hitting four checkpoints on time (results pending due to dumb luck). . Rained every day but race day. About 150 entrants. Fastest average speed of the day was 202 mph, a retired NASCAR Monte Carlo. New Corvette, Camaro and Mustang heavy, anybody can buy a car and go fast. The real cars were of course my 67 Impala SS 125 class, 72 Charger 150 class, 67 Mustang 150 class, 67 Charger 115 class, 77 Mustang II 140 class, 70 Dart 110 class and a hand-full of 60s Mustangs. Come on guys, get your muscle cars ready and I'll see you in September! Check it out..... SSCC.us

Awesome, Chris! Thanks for posting that. Hope to make it some day.