|
Re: 340 smallblock screamer
[Re: Hot 340]
#1511518
10/02/13 05:53 PM
10/02/13 05:53 PM
|
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
|
Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
|
I ran my 360 with pistons .011 out of the hole with the standard .039 FelPro and small chamber W5's without issues for 15 years buzzing it to 7500. I'm not saying you should do that, it was just the way mine ended up with the parts I had and the very limited 4 day time schedule to put it together while still holding down a 12 hour a day job. Piston to valve clearance was very tight too at .076/.083, you can believe I was puckering the first time I winged it in the water box. 
"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.
|
|
|
Re: 340 smallblock screamer
[Re: Guitar Jones]
#1511519
10/02/13 05:59 PM
10/02/13 05:59 PM
|
Joined: Dec 2006
Posts: 3,395
Pa
Hot 340
master
|
master
Joined: Dec 2006
Posts: 3,395
Pa
|
Quote:
I ran my 360 with pistons .011 out of the hole with the standard .039 FelPro and small chamber W5's without issues for 15 years buzzing it to 7500. I'm not saying you should do that, it was just the way mine ended up with the parts I had and the very limited 4 day time schedule to put it together while still holding down a 12 hour a day job. Piston to valve clearance was very tight too at .076/.083, you can believe I was puckering the first time I winged it in the water box.
I woulda been puckering too, man that is tight!
|
|
|
Re: 340 smallblock screamer
[Re: watermans340]
#1511521
10/02/13 06:33 PM
10/02/13 06:33 PM
|
Joined: Feb 2009
Posts: 1,532
off the grid
340B5
pro stock
|
pro stock
Joined: Feb 2009
Posts: 1,532
off the grid
|
That cam is more suited to a stroker. I tried one in my 340 installed per factory specs and ended up replacing it w/a Racer Brown that netted almost .4 in ET. Thinking back, if I would have advanced it 3 deg, it would have been close to the Racer Brown open/closing specs.
Yeah, it's got a smallblock.
|
|
|
Re: 340 smallblock screamer
[Re: watermans340]
#1511527
10/04/13 12:07 AM
10/04/13 12:07 AM
|
Joined: Feb 2004
Posts: 6,257
acworth / N. georgia - south e...
cheapstreetdustr
master
|
master
Joined: Feb 2004
Posts: 6,257
acworth / N. georgia - south e...
|
peak numbers are only a portion of it..
i would graph the flow and have a cam built the leverages your flow based on what you want to do with the car..
if the port is dead after .500" or goes turbulent then it would be unnecessary to go to .600"
thats an over simplification..but you get the idea
ill also say...lets say hypothetically .522" valve lift is a sweet spot in the port...than i would go just a lil past that valve lift so the port sees the sweet spot twice.once on the valves way up then again on the valves way down..
again this is over simplification ..but gives you some cause to do a little more home work.
some known combos have already sorted these things out.
but the/your hardware becomes the fixed items in the equation..the correct cam will put them to your advantage..fwiw
365" Iron J heads,,3480lbs best 1.39 60ft on SS springs.10.54,124 mph ...6.67 1/8th et.average 60fts 1.46 w/ small cam &.063 no2 pill tagged & insured
[image][/image]
|
|
|
Re: 340 smallblock screamer
[Re: Triple Threat]
#1511530
10/04/13 07:03 PM
10/04/13 07:03 PM
|
Joined: Feb 2007
Posts: 2,578
sweden
1Fast340
master
|
master
Joined: Feb 2007
Posts: 2,578
sweden
|
Quote:
More converter 
and more cam,and prefereably more compression.
i think camquest is on some serious ilegal substanses with there hp predictions..
|
|
|
Re: 340 smallblock screamer
[Re: 1Fast340]
#1511531
10/05/13 01:25 AM
10/05/13 01:25 AM
|
Joined: Jan 2003
Posts: 1,481
Outside
thedriver
pro stock
|
pro stock
Joined: Jan 2003
Posts: 1,481
Outside
|
That motor will make 320 to the tire.
1973 challenger
Dana. 4 speed. Low deck.
|
|
|
Re: 340 smallblock screamer
[Re: 1Fast340]
#1511532
10/05/13 02:18 AM
10/05/13 02:18 AM
|
Joined: Feb 2004
Posts: 4,501
Gainesville,FL
goldmember
master
|
master
Joined: Feb 2004
Posts: 4,501
Gainesville,FL
|
Quote:
Quote:
More converter
and more cam,and prefereably more compression.
i think camquest is on some serious ilegal substanses with there hp predictions..
Put a nice solid lifter cam in it and you have at least a chance. Camquest is garbage.
|
|
|
Re: 340 smallblock screamer
[Re: thedriver]
#1511533
10/05/13 02:22 AM
10/05/13 02:22 AM
|
Joined: Feb 2004
Posts: 4,501
Gainesville,FL
goldmember
master
|
master
Joined: Feb 2004
Posts: 4,501
Gainesville,FL
|
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?
|
|
|
Re: 340 smallblock screamer
[Re: thedriver]
#1511535
10/05/13 04:53 PM
10/05/13 04:53 PM
|
Joined: Feb 2004
Posts: 4,501
Gainesville,FL
goldmember
master
|
master
Joined: Feb 2004
Posts: 4,501
Gainesville,FL
|
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.
|
|
|
Re: 340 smallblock screamer
[Re: watermans340]
#1511537
10/08/13 01:39 AM
10/08/13 01:39 AM
|
Joined: Jan 2003
Posts: 8,028
Tulsa OK
Bad340fish
master
|
master
Joined: Jan 2003
Posts: 8,028
Tulsa OK
|
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
|
|
|
Re: 340 smallblock screamer
[Re: Bad340fish]
#1511538
10/08/13 08:25 AM
10/08/13 08:25 AM
|
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
|
Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
|
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.
|
|
|
Re: 340 smallblock screamer
[Re: Guitar Jones]
#1511539
10/08/13 03:40 PM
10/08/13 03:40 PM
|
Joined: Jan 2003
Posts: 1,481
Outside
thedriver
pro stock
|
pro stock
Joined: Jan 2003
Posts: 1,481
Outside
|
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.
|
|
|
Re: 340 smallblock screamer
[Re: Guitar Jones]
#1511541
10/08/13 05:08 PM
10/08/13 05:08 PM
|
Joined: Oct 2003
Posts: 11,684
W. Kentucky
justinp61
I Live Here
|
I Live Here
Joined: Oct 2003
Posts: 11,684
W. Kentucky
|
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.
|
|
|
|
|
I like and shoot for a mininum of .035 
The pistons will rock at TDC, hence only the outside edges of the pistons touching, it was not noticeable when turning the motor over with the spark plugs out when degreeing the cam and again when I checked the net valve lift at each retainer with the actual valve springs and valve lash set cold 
Evidently with the motor warmed up at WOT the pistons and rods grew enough to allow the piston edges to touch, no noise, no loss or gain of power once I switched the head gaskests to a thicker set of MLS 
I strongly suggest checking every piston to head clearances by putting the pistons at TDC with the heads on and torque down and then remove the rod caps and put a dial indicator on the rod and push the rod up into the head and see how much actual clearances to the heads you have cold on every piston 
