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Re: 340 smallblock screamer
[Re: thedriver]
#1511535
10/05/13 04:53 PM
10/05/13 04:53 PM
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Joined: Feb 2004
Posts: 4,501
Gainesville,FL
goldmember
master
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master
Joined: Feb 2004
Posts: 4,501
Gainesville,FL
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Quote:
Quote:
Quote:
That motor will make 320 to the tire.
 It very well may but I'd think that would be a gross under achiever.  why do all that for a 400hp build?
I was figuring slightly over 100hp loss to tire, so say 440hp. Which, in magazine world is probably 470hp.
Want 10s with a 340/ 727 demon?
Get a better head ( w2) get a biiiiiig solid cam think 7500ish rpm peak, get a converter in the 5000+rpm range. Make it really light.
That should get you close.
Wouldn't worry about any bigger carb than the 750.
550hp 340 that rolls on the street? Dream on.
I've never(on a good chassis dyno,and yep they vary all over the map) seen near the losses your predicting. 18% is the norm 400fwhp will put down 320rwhp happens all the time.
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Re: 340 smallblock screamer
[Re: watermans340]
#1511537
10/08/13 01:39 AM
10/08/13 01:39 AM
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Joined: Jan 2003
Posts: 8,029
Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,029
Tulsa OK
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I hope it runs 10s for you. The weight will make that easier.
I have something similar. 68 Barracuda 3500lbs, 360, 11:1, shady dell stage 2 port edelbrocks, solid roller, victor intake, 830 Holley, tti headers and a full exhaust system, 4500 8" ta converter, 727, 3.91 gears, 275/50 drag radials. Still ironing some things out but it's been a best of 11.37 and a best mph of 117.5. I let off before the mph traps on its best et run so the mph was way low. I haven't had it back out since drag week where it ran those numbers.
I wanted this combo to be in the tens and it likely won't get there. If it does make it there it will have to have more converter(5000-5500) and a low gear 904. The small tti headers likely don't help it any either.
Last edited by Bad340fish; 10/08/13 01:44 AM.
68 Barracuda Formula S 340
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Re: 340 smallblock screamer
[Re: Bad340fish]
#1511538
10/08/13 08:25 AM
10/08/13 08:25 AM
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Joined: Dec 2009
Posts: 20,647
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,647
in a cattle trailer down by th...
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Well having ran a 340 for many years I can tell you this, you really do have to wing it to make the horsepower. I was turning mine to 8000 rpm's. It requires a lot of gear (I was using a 5.13 with a 30" tall tire) and a low gear 904 really helps it. It would be SO much easier to do with a stroker though. 
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: 340 smallblock screamer
[Re: Guitar Jones]
#1511539
10/08/13 03:40 PM
10/08/13 03:40 PM
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Joined: Jan 2003
Posts: 1,481
Outside
thedriver
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,481
Outside
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Quote:
Well having ran a 340 for many years I can tell you this, you really do have to wing it to make the horsepower. I was turning mine to 8000 rpm's. It requires a lot of gear (I was using a 5.13 with a 30" tall tire) and a low gear 904 really helps it. It would be SO much easier to do with a stroker though.
I can't even begin to tell you how much time and money I've pissed away into 340's over the years to learn the hard way.
They make a great street package due to low torque, therefore quick to hookup on crappy tires while the other guy spins. On the track, like already mentioned, lots of converter, and lots of gear, so much of both that it becomes no fun to drive anywhere on the street real quick.
Fwiw, I've got a similar 340 to what you are trying to put together that was on my car before I went for more ci. I use a comp xehl 285 with .545 lift. Shift just past 6000.
When I had a 3.91 gear, and 3400 stall that thing would never '60 better than 1.85. That low stall killed it, but it's a street car too, happy medium ya know?
Was good for corrected 12.0's @ 3500lb, which, for what it is, is smoking.
There's a good reason why strokers are the rage.
And if you can get 500hp out of a 340 with flat tappet hyd cam thats done by 6200 ish and stock head in a 3.31" stroke I'll be calling you for lessons.
1973 challenger
Dana. 4 speed. Low deck.
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Re: 340 smallblock screamer
[Re: Guitar Jones]
#1511541
10/08/13 05:08 PM
10/08/13 05:08 PM
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Joined: Oct 2003
Posts: 11,684
W. Kentucky
justinp61
I Live Here
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I Live Here
Joined: Oct 2003
Posts: 11,684
W. Kentucky
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Quote:
Well having ran a 340 for many years I can tell you this, you really do have to wing it to make the horsepower. I was turning mine to 8000 rpm's. It requires a lot of gear (I was using a 5.13 with a 30" tall tire) and a low gear 904 really helps it. It would be SO much easier to do with a stroker though.
Even at 2900# you will need a bunch of gear, converter and RPMs. My 340 had ported Edelbrocks, a 237/242 @ .050 .590ish lift hydraulic cam, 11.2-1 compression, 727 with a 4500 converter and 4.30 gears and 28" tires. At 3260 or so pounds it went 7.24 in the 1/8 and low 11.60 in the 1/4. It ran on pump 93 and I drove it everywhere just like I do my 408 now.
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