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  #1  
Old 08-21-2002, 10:33 PM
sofa boy sofa boy is offline
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Default 340 improvements

i have a 73 cuda 340, it is stock except for headers & carb.
what do you think of this combo. j heads milled .050, mp 284
solid lifter cam, roller rockers, torker or torker II intake, holley
750 vacuum secondary or 800 double pumper?
these parts are all stashed in the garage so i would like to
use them if it would be a good combination. the car is a 4 speed, 3.55 sure grip, 295/50/15 bfgs and 2 1/2
exhaust. so far i have ran 14.8 at 97 mph.
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Old 08-21-2002, 10:51 PM
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1972roadrunner 1972roadrunner is offline
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check out my site: http://tmezz.mezzweb.com:81

personally, i would go with the torkerII, and 750... the 800DP is a little large for the 340. i have a Holley 650DP and i'm happy... i would also use the mechanical cam if your not already...i'm tired of my hyd. and i'm waiting for my comp cam to come in, which is mechanical...

good luck!
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Old 08-21-2002, 11:02 PM
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6 packin 6 packin is offline
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I would go with that combo! It will not cost you nothing but some skin and sweat! But I think it would benifit from a better intake and cam! Like a performer RPM, and a new technology cam! Like a comps xtreme energy! But since you have the parts let her rip! You can always change it or spend money later! If it works put some money in a gear if your in too racing! Over all sounds good! I would say maybe a little to much cam and intake for a stocker but a 4-speed helps you out!
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Old 08-21-2002, 11:49 PM
mtrv8n mtrv8n is offline
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Gearing is way too high..you need to go to 4:10 gears with tires that big. way too big for the HP output anyway. You could go to 265-50/15, instead of changing the rear..
You should be hitting 110mph at 5500rpm. Also, don't go too crazy, it'll tear apart.

A 750 double pumper would work better than the vac, at least it did when I had the stock motor in mine. Any intake is better than stock, and you should put in the MP ignition upgrade(I know, you already have electronic, but the new unit has a better advance curve and the orange box will work wonders)

I've had good durability and driveability with a Centerforce DF clutch, make holeshots easier. Solid lifter setup requires mucho maintenance, and you're not going to get it to rip over 6000 without fixing up the insides. The '73 has a cast crank, and is not the HP version that earlier years were. Unless you do a teardown and bring it up to 70 spec, stick with the hyd lifters and keep revs under 6000.
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Old 08-22-2002, 01:49 PM
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rumblefish360 rumblefish360 is offline
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mtrv8n has got the gear/tires combo right. Sge'll be a dog out of the hole for sure. Tou could get the 800 to work. It'll require alot of atten. to get it right. The gears will hold back any qyick torque release and the carb will be needed to be jetted right as well as the pump shot lasting long enuff to cover the weak spot in take off. Higher gears would be better. 4.10+
The rods should be re-equiped with stronger bolts. This is cheap Ins. against failure. The rods will take the HP as well as the crank. Just don't abuse it. Give it a HP oil pump. Lots of oil can't hurt when dealing with a stock bottom.
I would use the TorkerII for the street. Add a 4 hole spacer if you can. It'll help with the bottom end torque. Somthing a single plain lacks. A few extra Ft. punds with the current gearing will help.
Adj. rockers do require more atten. , but it should be liveable.
Remember to do the intake with the heads so it'll match up.
The milling of the heads will throw everything off. It'll need to be matched up wit the intake again.
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Old 08-22-2002, 02:11 PM
451Mopar 451Mopar is offline
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When the heads are off to mill them you could install larger valves and port the heads. The Torquer II, 750 CFM carb and 284/484" cam will work to make good upper RPM power. Your low RPM response may be a bit weak under 3,000 RPM.
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Old 08-23-2002, 11:20 PM
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LA360Dart LA360Dart is offline
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Hi Sofa boy;

Just a thought having run a very similar combination, if you can afford to get the compression up to 9.5 to 1, the late 340's 72/73 suffer from low compression. Change the pistons to KB/Silvolite of Fed/Mougal type piston that will wake up the combo even more, My 73 Dart Sport340 with a 360 and 2.02/1.60 heads "J" milled .050. Intake is a Weiand Stealth and a TQ or 750 Edelbrock and 284/484 cam (some of the valves touched the pistons could see small marks on the pistons) 727TF with 2500 rpm converter and 3.55's with 275/60X15's, ran best of 14.10's at 101 mph most of the time ran in 14.20's at 99. Changing the compression alone would have made combo more drivable and stronger all around. Plus would have had more V/P clearance. My vacuum at idle is 6" to 7" hg and 12 deg. of inital at idle. Currently installing a magnum headed 360, hope to have running soon.


Denny
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  #8  
Old 08-24-2002, 10:04 AM
mtrv8n mtrv8n is offline
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you also seem to have too tall a gear ratio for your setup. Those cars shipped with 215/70/14 and 3:55 (mine..) and ran about 14.5 stock.

That works out to a 2.8 inch tire height difference, 10 percent, which means you should have a 3:88 gear or higher.You really don't have enough power to justify 10 inch wide tires, so a cheap way to get the gear ratio down is to slap on a set of 265/50-15, for a tire height of 25.4 , put 215 60 on the front for a size match.

The tire width will be more than enough, and you'll scoot!
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