superdavid

Hey what kinda hp are you getting outa that 408? I have almost the same exact setup completed in my 67 coupe.

THUMPIN455

Not only engine tuning but suspension tuning as well. With the high 11/low 12 second street/drag car we ran, rebuilding the front calipers, turning the rotors, new brake pads, and repacking the wheel bearings netted .3 ET reduction and a 4mph trap speed increase. A custom alignment made the car much easier to drive and also netted a .2 decrease in ET. When I did the alignment I raised the front end about two inches from static, set the toe at zero, camber at zero, and caster was 2.5 degrees. about one degree of toe in works pretty well too since the tires are pushed back by rolling resistance.


As for the engine, if its a vacuum secondary carb, try some lighter springs in it. If you have hood clearance try a 1" and or a 2" spacer under the carb. A ram air, or cool air source is worth an honest .2 and 2mph if you can get air from the front of the car to the carb. Just opening the small scoops on the GTO hood and running a taller filter so theres a gap between the lid and base dropped the ET that much. Even something simple would work for you.

400ci in a 3000-3400lb car shoudlnt have a problem with 3.25 gears and 12 second ETs. Especially with the heads and intake you have, the 3k stall should let it rev right where it needs to, you might not 60ft real hard but the ET should still be there. 1.9 60s are GREAT for a street car, but with some suspension work you can get them down to the 1.7 range rather easily. Unless your cam is a 250 degree @ .050 monster, it should pull pretty hard from 3000-3300 to over 6500. We have built quite a few 400 ci engines and 12s in a light car is real easy, usually we run a cam in the 234-240 @ .050 range with a 400. Even though they are Pontiacs, they are similar in design to the Ford Windsor, at least port wise..

Its in the small things because the big things are taken care of..

espskillz

thats sick i hope someday my car will run 12's . well keep up good work with your car. im jealious

espskillz

thats sick i hope someday my car will run 12's . well keep up good work with your car. im jealious

Justin66GT

Here are some engine bay pics from right after I put it together. I will post in the member gallery or whatever soon.









Front end is fairly new (I did the Granada swap) and I have SSM lift bars out back too. The carb has mechanical secondaries and plenty of air around it. Here are the cam specs:

Comp Cams part # 35-609-5, grind number FW 285B-6, serial number CB2175
gross valve lift I .568 E .592
duration at .020 = I 285 E 295
duration at .050 = I 250 E 260
lobe separation = 106

So yeah it's large by huge, supposedly to help with the compression ratio and be suited more for nitrous.

I haven't been to a dyno yet, was thinking of having them do a baseline and then install a simple nitrous kit and tune it for that, with an after dyno to show the gains. A desktop dyno program rated the setup at 413 HP @ 6000 and 424 TQ @ 4500.

Justin

Cannonball888

Agreed. Here is a classic '66 Mustang with a naturally aspirated 347 running 12.01

http://media.putfile.com/Rodneys12

Specs:

Roller block with a Scat stroker crank (347ci)
Hyper flat top KB pistons
AFR 185 60cc heads give about 10.0:1 compression
Comp Cam XE274H flat tappet cam
Professional Products Air Gap Dual Plane Intake
Demon 650 Vacuum secondary carb
1 5/8" Hooker Comp headers
2 1/2" exhaust with flowmasters

Cannonball888

Just an update. This guy's best time was 11.87 @ 112!

I didn't mean to hijack your thread Justin66GT but this guy's classic is just amazing. It's my inspiration for going to the track for the first time November 18th.

66 stang

man, that stang in the video was fast.........i would be proud to race that.....