340 Vs 360

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Let's talk about bullshit transfer! There's been a lot of that. Bullshit X work divided by h2o = diarrhea. There's been a lot of brain diarrhea here. I would suggest a TP break. Buy a 360. Done! I did it I made you're decision. Next!
 
383 0r 440 ?? way to start a new argument ! I;ve built 3 440 , never met a 383 it could not beat . :)

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fishmens67 said:
340 or 360? your choice, can't go wrong with either one. but, I will stick with 383.
we have built many over the past 35 years. they are bulletproof!
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jerry6 said:
383 0r 440 ?? way to start a new argument ! I;ve built 3 440 , never met a 383 it could not beat . :)

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really! only 3! I don't argue only voiced my opinion.
but, I guess you never raced a decent 383. lmao
 
Hersbird said:
Say for a minute you had a motor that had a perfectly flat torque curve from 1000 rpm to 6000 rpm and stays in the same gear. Discounting wind resistance the car will accelerate at a constant rate all though 1000-6000rpm because the torque is what is working. Yet the car is making 6 times as much HP at 6000 rpm it isn't accelerating any faster then it is at 1000 rpm.
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Sorry you just proved my point the only thing accelerating that car is that the engine is going from 1000 to 6000 rpm (rpm ain't a by product).
Since your trying to say that engine has as much energy at 1000 rpm than it does at 6000 rpm. All you would need is a variable transmission that would keep the engine 1000 rpm, I'm sure that car wouldn't accelerate to fast and top out at a low mph. But now put a variable transmission that keeps that car 6000 rpm it will accelerate like a rocket and top out at a high mph.
 
damn,..this ant a entrance exam form a college professor position...

the differences is bore an stroke an oil pan...build what you want, build what you can afford,..enjoy your car....ether way there ant no feeling like moparmobiling!!!
 
This is way we have drag racing.
The guy with the slower car can win if the faster cars driver is asleep at the tree.

Stroke in this instance trumps in most street builds, but there is fault with trying to say "built both the same this 360 or that 340.will make more power. You can't gear them the same even...it can never be an apples to apple's comparison and be fair.
Dumb that we have guys so bored as to argue one Mopar mill against the next when the main ingredient to both of them making power in factory trim is the heads, and we know 360's never got a 2.02 head from the factory! Stock for stock or no more talk.lol
 
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I don't think this a 340 vs 360 thread anymore
There both very capable engine especially for the power range that most people will build them to 350-450 HP.
 
:happy1:....................All engines make power -- but how you use the power you have --- is everything.
Many cars with less powerful engines are beating cars with more powerful engines.
The power to the rear tires and the weight of the car is all that matters ----outside of traction.
 
Hey Skrews, your beating a dead horse graphic on page 3 was hilarious but too small to get the combatants' attention.
Now, your head on train wreck graphic is just too much!
Thanks
 
Correct me if I am wrong, but transmission comes into play here.
If you are shifting gears, you can rev that 340 to it's redline to gain hp advantage, obviously mostly on a track.

Can't do that with an auto, so take advantage of the stroked torque of the 360 for the street.
 
T67 has it!
a local retired racer with a lifetime of experience often speaks of an engine combination that was quicker than the same engine with modifications that gave it higher HP on the Dyno
too many worry about numbers
 
But smaller displacement needs a less cfm carb meaning the smaller displacement is doing as much with less, so if the carbs are equal the larger displacement has less to work with so if equal the smaller has more and the larger has less so its achieving more by using less.... heh??
 
Why not add this comparison, stroked 416 or 408 with the same internals heads etc., now the 340 trumps per cubic inch.
 
318willrun said:
But smaller displacement needs a less cfm carb meaning the smaller displacement is doing as much with less, so if the carbs are equal the larger displacement has less to work with so if equal the smaller has more and the larger has less so its achieving more by using less.... heh??
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I've read this several times, and I'm not sure what you're getting at..........
 
JBurch said:
I've read this several times, and I'm not sure what you're getting at..........
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Sure, it makes sense! See, they are say'n all being equal (same carb, cam, etc), the bigger displacement makes more torque. But if the smaller displacement has the same carb, then it has more because the cubic inches per cfm isn't the same. But if you give the cfm's according to displacement, then all isn't equal because the bigger engine has a bigger carb meaning more opportunity.... Seeeeeeeeee?????????????????
 
318willrun said:
Sure, it makes sense! See, they are say'n all being equal (same carb, cam, etc), the bigger displacement makes more torque. But if the smaller displacement has the same carb, then it has more because the cubic inches per cfm isn't the same. But if you give the cfm's according to displacement, then all isn't equal because the bigger engine has a bigger carb meaning more opportunity.... Seeeeeeeeee?????????????????
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That's not how it works in practice.

For an extreme example... If you take a 1bbl carb from a slant six and install it on a 440 it will still make more horsepower than the slant six did.

Prepare for more BS guys, When an engine needs to draw more air than the carburetor is rated for, It can and will flow more than CFM rating albeit at a higher pressure drop.

This means that the slant motor might have 1.5" Hg vacuum in the intake manifold at WOT but the 440 might have 4" Hg. the 440 WILL consume more air and make more horsepower, even though it isn't doing it efficiently.

In race engines they typically aim for 0.3" - 0.6" of manifold vacuum, just enough to get the carburetor to meter fuel while allowing for maximum airflow to the engine.

EDIT: this explains why you might see seemingly ridiculously oversized carburetors on smaller capacity engines. low manifold vacuum at WOT = efficiency.
 
jerry6 said:
383 0r 440 ?? way to start a new argument ! I;ve built 3 440 , never met a 383 it could not beat . :)

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LMAO I've never saw a 383 that could get out of its own way! The 318 of the big block world, great for getting granny to bingo or keeping a boat in one spot on the lake. (insert the pot stirring icon here)
 
My 340 is bagged and racked, I murdered a #s matching 1971 corvette roadster when the shifter malfunctioned and literally shattered the motor (probably had to do with the severity in which I hammer muscle cars);-) I built a 360 used the the heads and intake and it pulls the front tires 1/2" on launch. That was before I redid the suspension and disassembled and restored my 1970 340 Scat Pak... Almost done, interior assembly and wiring yet to go.
 
frosty_the_punk said:
That's not how it works in practice.

For an extreme example... If you take a 1bbl carb from a slant six and install it on a 440 it will still make more horsepower than the slant six did.

Prepare for more BS guys, When an engine needs to draw more air than the carburetor is rated for, It can and will flow more than CFM rating albeit at a higher pressure drop.

This means that the slant motor might have 1.5" Hg vacuum in the intake manifold at WOT but the 440 might have 4" Hg. the 440 WILL consume more air and make more horsepower, even though it isn't doing it efficiently.

In race engines they typically aim for 0.3" - 0.6" of manifold vacuum, just enough to get the carburetor to meter fuel while allowing for maximum airflow to the engine.

EDIT: this explains why you might see seemingly ridiculously oversized carburetors on smaller capacity engines. low manifold vacuum at WOT = efficiency.
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But what if the people with the same cubic inches (all being equal) live at 6000 ft. above sea level? Then wouldn't the longer stroke of the two have more validation? Wouldn't a 318 stroked to a 349 have more torque than a 340 bored .060 over, all else being equal.... Ahhhhh, the X factory, altitude.......... lol
 
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