1/4 Mile Estimate

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TXOval

TXOval

340 stroked to 416
Joined
Jul 23, 2022
Messages
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Location
Conroe, Texas
Looking for opinions/advice. I’ll post my cars specs/setup.

66 Barracuda, full interior, all original sheetmetal.

3.73 gears in an 8-3/4 rearend with Inward leaf spring kit

Full welded in frame connectors

904 trans, built by COPE, but A&A manual valve body

4 wheel power disc setup

340, but stroked/bored to 416. Forged crank, forged h-beam rods, forged Mahle pistons, hydraulic roller cam, Victor 340, Holley Super Sniper setup.

Cam is relatively mild, .578 lift, 230ish at .050. Total duration is 288/280

462hp on dyno

I am installing a Nitrous Express 2-stage setup and will probably start with a 100hp shot on both stages.

I’m afraid my car will not meet track requirements due to potential 1/4 time…no cage

I’m new at this and have no idea what this setup could run. Any help would be appreciated.

17” billet specialties rims…

front MT runners 26x6
Rears are 245/45 drag radials

No line lock setup
 
I would recommend you put a cage in it. if you're mid 11's NA you're going to be in the low to mid 10's sprayed. Also, I'm not aware of any tracks in Texas that are 1/4 mile anymore except for street cars. Everyone has gone to 8th mile for bracket cars.
 
You'll need to make sure you have a decent setup with respect to your chassis. Mid to low 11's is easily achievable. 65
 
I didn’t think about tracks in TX, but I forgot about Baytown shutting down their track.

I’ve been driving the car for a year without the nitrous kit, but I haven’t rev’d it through all the gears or even a launch. I had 225 BF’s on it originally and it would just blow the tires off of it.

My 64 Nova only had a bone stock crate 350 in it…so the power difference is significant with the Barracuda.
 
No mention of what the convertor is, so it’s way more of a guess than knowing what it is.
Anywhere from mid 11’s to mid 12’s
 
Any recommendations on when to bring the nitrous on? The Sniper will control it and I think I’m going to make the second stage manual (push button)
 
What it should run and what it will run can be two different things
On all motor.... 11.10
On spray... as far as the shot will take ya
 
TXOval said:
I didn’t think about tracks in TX, but I forgot about Baytown shutting down their track.

I’ve been driving the car for a year without the nitrous kit, but I haven’t rev’d it through all the gears or even a launch. I had 225 BF’s on it originally and it would just blow the tires off of it.

My 64 Nova only had a bone stock crate 350 in it…so the power difference is significant with the Barracuda.
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I'm thinking it's going to take you a while to get it sorted out traction/tune wise. Besides that, don't skimp on safety equipment and I would strongly recommend you get at least a 6 point roll bar or better yet a full cage and a trans blanket and shield. By the way, if your racing on a prepped track(glued), your 8 3/4 is going to have a limited life span.
 
I definitely need to step up the safety features which is my main concern.

The 8.75 does have a Yukon center section with 489 case, Sure-grip

30 spline Moser axles
 
TXOval said:
I definitely need to step up the safety features which is my main concern.

The 8.75 does have a Yukon center section with 489 case, Sure-grip

30 spline Moser axles
Click to expand...
The 8 3/4 will be fine.
My old 63 Max wedge car ran 10.30's with a 8 3/4 with keyed axles.
 
TXOval said:
I definitely need to step up the safety features which is my main concern.

The 8.75 does have a Yukon center section with 489 case, Sure-grip

30 spline Moser axles
Click to expand...
It's the housing that's the weak. It will flex and twist. It will last for a while, but not forever.
 
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318willrun said:
What it should run and what it will run can be two different things
On all motor.... 11.10
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How will this happen with a 3400 converter and 3.73's?

I'll say 12.10 for the first day.
 
413 said:
How will this happen with a 3400 converter and 3.73's?

I'll say 12.10 for the first day.
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Like I said.... what it should and will may be different.

My friends Duster just ran 7.30 which should be 11.4's. Stock stroke 340, 727, 4.10's, not sure of the converter. The OP has bigger/stronger engine, 904, I'd expect it to beat the 340 Duster if I assembled that build. 11.10 is where I'll sit (at least) on all motor
 
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what head is on the engine? That cam with any decent head should make 500+ with the rest of the parts.

If you've never run Juice. Tune the engine first for max MPH, then run the juice on it. If you have an AF meter, even better. The best NA tune and Juice tune should have relatively the same AF ratio.
Bad engine tune + rough/bad nitrous tune = broken engine parts.

Should run 120+ out of the box. ET going to depend on hook, chassis efficiency
 
Speedmaster CNC version (Ports and chambers) 2.02 intake, 1.8 exhaust, 190 intake runner.

11.5:1 static compression.

Chassis dyno, 401 at wheels…it used 1.15 to calculate engine HP
 
Sniper fuel injection, dual O2 sensors.

14.7 afr at cruise, 12.7 at WOT

My exhaust system is part of the problem with full potential. Shorty headers, Sanderson DD9’s, 2.5” collectors to 2.5 pipe, X-connector, dual 40 flowmasters.
 
12.10... first time out.. bugs.. nerves..... will get better.
 
I appreciate everyone’s replies!

It seems like 12’s to 11’s depending on chassis/suspension/tires and of course the driver :rofl:
 
TXOval said:
I appreciate everyone’s replies!

It seems like 12’s to 11’s depending on chassis/suspension/tires and of course the driver :rofl:
Click to expand...

Here's the thing... if it goes 12.80... smile and have fun... if it goes 11.10...smile and have fun :) It's a day at the track..
 
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