First time down the track

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67Cuda408

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I took my 67 Barracuda to the track for the first time last night. Had a blast but feel like I’m definitely leaving some on the table. It’s a 408 making around 450hp, 904 3000 stall, 8 3/4 suregrip 3.73s, 3200lbs, these two runs we’re on street tires. How much do you think I’d stand to gain going to drag radials? Drove it to the track lowered tire pressures and raced it, any other adjustments I should have made?

Run 1 Run2
60’ 2.248 2.303
330 6.319 6.022
1/8 9.458 9.069
Mph 79.44 81.05
1000 12.115 11.688
1/4 14.346 13.898
MPH 101.44 102.38
 
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Rather than trying a tire that serves half the job half the time in both situations, why not get a second set of rims with slicks and swap them on at the track? Very simple to do.
 
My67 cuda would 60' right around 1.6 with Hoosier QTP's set at 17 lbs and full slicks were barely better, although way more consistent launch

In the end my car drove to the track and ran 10.40 at 132mph all street legal....Aluminum headed BB, 3500 conan converter, 410 years, 175ish shot of nitrous.....was 11.00 on engine

FWIW.... Caltrac shocks on all 4 corners helped my launch tremendously (90/10 front shocks and extra long imperial shocks ain't all that), after my shock change it was immediately pulling the front tires off the ground5

I could never "blow the tires off" with cheaters or slicks 28" or bigger.....26" I could overpower..........that's leaving at 2500 rpms with nitrous on the launch.
 
Something is way off with the tune IMO. No way that combo makes anywhere near 450 hp as-is with a 102 mph trap speed.
 
67Cuda408 said:
Interested. What mph do you believe it should run?
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450 at that weight it should easily run 112-114. Spinning tires usually doesnt kill MPH as much as they do ET.
My little brother has a 71 Dart street car. Bone stock 70 340 in it with mild aftermarket cam, headers, intake, 750. Has 4.10 gear and 3000 ish convertor its been 12.90 at right at 104 to give you a comparable MPH.
Your off at least 10 mph somewhere. Thats a ton
 
B3422w5 said:
450 at that weight it should easily run 112-114. Spinning tires usually doesnt kill MPH as much as they do ET.
My little brother has a 71 Dart street car. Bone stock 70 340 in it with mild aftermarket cam, headers, intake, 750. Has 4.10 gear and 3000 ish convertor its been 12.90 at right at 104 to give you a comparable MPH.
Your off at least 10 mph somewhere. Thats a ton
Click to expand...
holy crap I’ve got something to figure out then.
 
I've ran quicker than that with a mild 318, stock converter, and a peg leg 3:23 in a duster...8:90 @ 81 in the 1/8th. On street tires. You have MAJOR issues
 
I thought it should be faster but had no idea how far off I was. Time to go to work.
 
Describe your 450HP build. Many overestimate their power due to no fault of their own. Some are sold 400HP motor to find they are not all that.
 
pishta said:
Describe your 450HP build. Many overestimate their power due to no fault of their own. Some are sold 400HP motor to find they are not all that.
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10:1 compression
Forged KB pistons
Ported Cast Iron heads 2.02/1.60 valves flowed at 280cfm average between all runners
.510 .510 cam 244/244 at .50
Edelbrock RPM Air Gap with Holley 750 port matched to the intake, not gasket matched
Headers
All MSD ignition
20* initial timing
40* total timing
 
67Cuda408 said:
10:1 compression
Forged KB pistons
Ported Cast Iron heads 2.02/1.60 valves flowed at 280cfm average between all runners
.510 .510 cam 244/244 at .50
Edelbrock RPM Air Gap with Holley 750 port matched to the intake, not gasket matched
Headers
All MSD ignition
20* initial timing
40* total timing
Click to expand...
Maybe try to get that total timing down to 32-34.

Jake
 
Tiny camshaft, but other than that, seems like cookie cutter parts. What iron heads are they?
280 is stout flow out of a factory iron head.
But with the lift of your cam its unlikely your seeing a big chunk of that.
Short of putting on a good hooking tire, the first thing i would do with that combo is throw that cam is the trash can.... lol

I had a somewhat similar combo, 9.5 ish compression, Similar type cam, bone stock eddies( not close to as good as yours are if they flow 280) 750 and M1. This on a stock stroke 360. With more convertor and a bit more gear it went 12.20’s at 109. 3300 pounds
Put a real camshaft in it, mildly ported the heads( and milled to get up over 10 to 1, and installed airgap. Has now been 11.20’s at almost 119, still stock stroke and nothing fancy
 
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B3422w5 said:
Tiny camshaft, but other than that, seems like cookie cutter parts. What iron heads are they?
280 is stout flow out of a factory iron head.
But with the lift of your cam its unlikely your seeing a big chunk of that.
Short of putting on a good hooking tire, the first thing i would do with that combo is throw that cam is the trash can.... lol

I had a somewhat similar combo, 9.5 ish compression, Similar type cam, bone stock eddies( not close to as good as yours are if they flow 280) 750 and M1. This on a stock stroke 360. With more convertor and a bit more gear it went 12.20’s at 109. 3300 pounds
Put a real camshaft in it, mildly ported the heads( and milled to get up over 10 to 1, and installed airgap. Has now been 11.20’s at almost 119, still stock stroke and nothing fancy
Click to expand...
Yeah I’ve got really solid head guy. No homo. I believe they’re just 360 heads from the 80’s tbh. Do you think my 450hp estimate is way off with the combo I have?
 
The combo you describe sounds like a 450hp combo to me. But obviously you’re falling short at the track. Your total timing seems like a lot to me. Mine likes 34 degrees and not a bit more. It starts to fall on its face after that so I wonder if yours just has too much timing. Pull the timing back and see what it does.
 
Something is off..my stock stroke 360 with mildly ported Edelbrocks and a larger cam run's 11.70's with a 1.50 60 foots!!..As for the tires Street tires are for the STREET..get yourself some m/t drag radials and learn where the car likes to launch(rpm wise) you'll see a BIG difference..
 
And yes get a set of slicks or radials. You’ll be fighting those street tires for any decent 60’.
 
clinteg said:
The combo you describe sounds like a 450hp combo to me. But obviously you’re falling short at the track. Your total timing seems like a lot to me. Mine likes 34 degrees and not a bit more. It starts to fall on its face after that so I wonder if yours just has too much timing. Pull the timing back and see what it does.
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You think that timing could cause as large as a disparity as it seems there is?
 
67Cuda408 said:
You think that timing could cause as large as a disparity as it seems there is?
Click to expand...

I think it’s one part of multiple things. I doubt it’s the only part of your issue.
 
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