340 max camshaft with exhaust manifolds

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Illahe

Mopower
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Hello All,

As we all have access to dynamic compression calculators and gear mph graphs...I'm looking for feedback from individuals who run solid lift cams with oem exhaust manifolds.
Gears are not an issue (plenty of sets). 904/727 available 26" tire. Building a sleeper for my Son. 72 dart.

Thanks.
 
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Why Max, you can run pretty big cams in less than ideal combos circle track guys do all the time.

You want the cam that will give best results for intended purpose of the car .
 
Put in anything you want. Manifolds will just hold you back after you get past a 340 spec cam.
 
^^^ this.

intended purpose and driving style are nearly as big of factors as compression, heads and induction. stop light eliminator? hot street ripper? something with a bit of manners?

since you mentioned "sleeper" i'm guessing you want something that passes the eye test as resembling a stock dressed motor, ie not a big *** tarantula intake topped with a 1050

that said, what do you got and what are you working with?
 
Unless you run deep gears on the street it’s hard to spend much time above 5000 rpm at reasonable street speeds, so stall speed to 5000 rpm is where you want to mainly focus on, while not killing drive ability.
 
The 1970 Mopar Hustle catalog listed first recommended improvement were LD340, 3310/780 Holley, and Hooker underchassis headers, - no camshaft !
 
inertia said:
The 1970 Mopar Hustle catalog listed first recommended improvement were LD340, 3310/780 Holley, and Hooker underchassis headers, - no camshaft !
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you realize they invented "cheater" cams for reason...P4007275. Next time your at a national event ask the stock eliminator racers there cam specs...I've yet to get a response.
 
junkyardhero said:
^^^ this.

intended purpose and driving style are nearly as big of factors as compression, heads and induction. stop light eliminator? hot street ripper? something with a bit of manners?

since you mentioned "sleeper" i'm guessing you want something that passes the eye test as resembling a stock dressed motor, ie not a big *** tarantula intake topped with a 1050

that said, what do you got and what are you working with?
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Appreciate the responses. Your correct, stock appearing. I have several solid grinds and a couple of long block combinations. Looking for members running a solid flat tappet with OEM exhaust. Think about it, 273, 340 383 413, 426 wedge came with manifolds. The 62 Dart 413 came with .495/300 solid cam making peak power at 5400 rpm.
 
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toolmanmike said:
Put in anything you want. Manifolds will just hold you back after you get past a 340 spec cam.
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Appreciate your response. OEM 340 camshaft is pretty bland, like dry toast. Surely someone on here has at least ran an Isky E-4
 
i'm not entirely sure what point you're driving at?

is it what's the biggest cam i can run with stock exhaust and not sacrifice any significant power? because that's already pretty much been asked and answered.
 
stock 105k miles 68 340 lower end comp 268 218@50 454 110/106 factory 340 manifolds stealth intake 650 dp 727 tf2 3.91 sg use to be 3.23s
That cam was still nice with 3.23s
169 cranking psi 9.99 legit comp ratio
unilte dizzy power timed no pinging on 94
The newer comp 268 wasnt out then
268xe
224 230 477 480 110/106
Thats a good street cam that will scream in your 340 for a street cam
 
inertia said:
The 1970 Mopar Hustle catalog listed first recommended improvement were LD340, 3310/780 Holley, and Hooker underchassis headers, - no camshaft !
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Yes, enthusiasts see things differently above the 49th parallel. for instance, OEM 340 springs are a tad light for an aggressive ramp profile.
 
a-bodyguy said:
stock 105k miles 68 340 lower end comp 268 218@50 454 110/106 factory 340 manifolds stealth intake 650 dp 727 tf2 3.91 sg use to be 3.23s
That cam was still nice with 3.23s
169 cranking psi 9.99 legit comp ratio
unilte dizzy power timed no pinging on 94
The newer comp 268 wasnt out then
268xe
224 230 477 480 110/106
Thats a good street cam that will scream in your 340 for a street cam
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Bingo. Thank you. I don't run hydraulic cams. but the duration of your cam is useful. +1 on the exhaust manifolds!
 
junkyardhero said:
i'm not entirely sure what point you're driving at?

is it what's the biggest cam i can run with stock exhaust and not sacrifice any significant power? because that's already pretty much been asked and answered.
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Stock eliminator cars run sub 12's...Spoke to one at Gainesville and he's running a solid. No specs given.
 
Illahe said:
ah, Okay...there's a reason the stock 340 cam found its way in 4bbl 318's too...
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yeah, true. but the compression and bigger valves and what not from the 340 made made it a different slice of pie.

68 340 4spd cam was a different ball of wax, too.
 
Illahe said:
Stock eliminator cars run sub 12's...Spoke to one at Gainesville and he's running a solid. No specs given.
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stock eliminator cars are anything but stock. sure they use some stock components but after that? they have very little in common with a street motor. and wouldn't live a long life or be enjoyable to drive on the street for that matter.
 
Illahe said:
Stock eliminator cars run sub 12's...Spoke to one at Gainesville and he's running a solid. No specs given.
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stock 340 auto cams run high 12s
With manifolds you want low and midrange power under the curve shift 5500 to 5800
 
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