340 Camshaft

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The 68' 340 4 speed cam was a little hotter than the auto cam. Mellings used to make them
 
Russ Knight said:
I have a stock 340 325hp with low miles on it. Looking to go to a little more aggressive camshaft, but not anything that would require mods other than perhaps 1.6 rockers. Will be used primarily on the street with the occasional strip runs. Suggestions?
Click to expand...


What size tires and rear and gears are you running now?

How much more rpm is OK to run to achieve the power?
How much low end torque loss is OK?
 
273 said:
What rear gears are you running ?
4 gear or auto ?
Guessing by saying 325 hp your saying you got the high cr & 2.02 340.

Stock specs are something like this
268/276 210/220 @50 429/444 lift 114 lsa.

Could go to popular 110 lsa add 0.040-0.050" + lift and 5 to 15 degrees @ .050" depends on what you are looking for, something like (or other brands with similar specs) comp cams xe262h or xe268h pretty popular upgrades.
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Actually I am doing a swap into a 2004 Dakota. Most likely going to stay with stock diameter tires which are 245/70R16, about 29.5 inches tall. Going to run a streetable gear, most likely a 3:55. I have an 8 3/4 posi rear with 3:91 gears in the Duster now. Not sure if the width will be correct for the Dakota and I certainly don't want the tires sticking out from under the fenders. May just put a chunk in the Dakota rear for now. Engine is bone stock with around 50,000 miles on it, and just purchased a complete 6 pack setup for it. The engine does have the high compression 2.02 - 1.60 heads. Don't want anything super radical, just something with a good lope that will be strong out of the hole. Can go with roller lifters and 1.6 rockers if profitable. Automatic transmission, not sure about any stall. Open to all suggestions, and thank you.
 
harrisonm said:
I have a 69 Barracuda with a 340, 4 Speed and a 3.55 Sure Grip and headers. About 12 years ago, I added an Edelbrock Air Gap, 750 CFM carb and a Comp XE268 cam kit (cam, lifters springs). It is an awesome cam. It sounds great and has lots of power. I can melt the rear tires. This combo is good for 375 HP. If you want more power, look into the Comp XE272. It's a little more aggressive and will give you more power.
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Thank you very much! I will certainly check those out.
 
Garrett Ellison said:
What head castings do you have and what’s your compression? Manual transmission or automatic and rear gears? If automatic, what stall? Are you prepared to upgrade the valve springs? If going with a 1.6 adjustable roller rocker, I’d go with this cam and matching springs. Im fairly sure that this is the street force II that @junkyardhero mentioned. It’s on a 108 LSA, which is optimal for the 2.02 intake 340. The intake centerline is on a 104, but if you’re gearing is a little high and converter is a little tight then you could install it on a 100 ICL.
Howards, Hydraulic Flat Tappet Camshaft, Chrysler SB 273-360, 221/221 @ .050, .470/.470, 108 LS-Competition Products
Click to expand...
Thank you!
 
Here's mild hop ups to a stock 340

https://www.motortrend.com/how-to/mopp-0102-1970-340-high-performance-mill-dyno/

Phase 1: Stock 340 baseline, Chrysler electronic ignitionPhase 2: Replace small production AVS with Edelbrock 800 CFM carbPhase 3: Replace factory HP manifolds with Hooker 151/48-inch headersPhase 4: Replace factory iron 340 HP intake with Edelbrock Performer RPM Air GapPhase 5: Replace SSI springs and retainers with Engle #604LS retainers and #993 springsPhase 6: Replace stock 340 HP cam with Comp Xtreme Energy 268

Horsepower
RPMPhase 1Phase 2Phase 3Phase 4Phase 5Phase 6
3000185.2195.5199.6206.4206.2214.7
3200195.4206.1213.9220.7220.8229.3
3400208.9224.6233.0240.6240.5251.5
3600224.8238.7252.7260.8259.9275.7
3800236.4253.7266.6277.0276.9298.1
4000249.5267.6280.0291.8291.8311.7
4200259.3278.9292.9306.0306.2327.1
4400265.0287.1304.3321.3321.3344.6
4600268.8297.2313.3335.2334.7355.9
4800274.7306.8321.1343.1342.5366.7
5000278.5312.7329.1352.6350.4377.0
5100280.2316.9330.6354.5352.4381.3
5200281.3316.9330.8353.6353.6384.3
5400273.7314.9329.3350.8355.4386.1
5500273.5313.9330.4350.7355.9387.4
5600269.3314.5330.2350.9353.5389.4
5700312.7329.3348.6353.3391.6
5800308.8326.2347.6351.4387.2
6000329.2353.4383.7
6200314.8373.7
Show Less
Torque
RPMPhase 1Phase 2Phase 3Phase 4Phase 5Phase 6
3000324.2342.3349.5361.4361.0375.8
3200320.7338.3351.1362.3362.3376.4
3400322.7347.0359.9371.6371.5388.4
3600328.0348.2368.7380.4379.1402.2
3800326.8350.7368.4382.9382.7412.0
4000327.6351.3367.6383.1383.1409.3
4200324.3348.8366.3382.7382.9409.0
4400316.4342.7363.2383.5383.6411.4
4600306.9339.3357.7382.7382.1406.3
4800300.6335.7351.4375.4374.8401.3
5000292.6328.5345.7370.4368.1396.0
5200284.1320.1334.1357.2357.1388.1
5400266.2306.3320.3341.2345.6375.5
5600252.6295.0309.7329.1331.7365.2
5800279.6295.4314.8318.2350.6
6000288.1309.3335.8
6200266.7316.6
 
273 said:
Here's mild hop ups to a stock 340

https://www.motortrend.com/how-to/mopp-0102-1970-340-high-performance-mill-dyno/

Phase 1: Stock 340 baseline, Chrysler electronic ignitionPhase 2: Replace small production AVS with Edelbrock 800 CFM carbPhase 3: Replace factory HP manifolds with Hooker 151/48-inch headersPhase 4: Replace factory iron 340 HP intake with Edelbrock Performer RPM Air GapPhase 5: Replace SSI springs and retainers with Engle #604LS retainers and #993 springsPhase 6: Replace stock 340 HP cam with Comp Xtreme Energy 268

Horsepower
RPMPhase 1Phase 2Phase 3Phase 4Phase 5Phase 6
3000185.2195.5199.6206.4206.2214.7
3200195.4206.1213.9220.7220.8229.3
3400208.9224.6233.0240.6240.5251.5
3600224.8238.7252.7260.8259.9275.7
3800236.4253.7266.6277.0276.9298.1
4000249.5267.6280.0291.8291.8311.7
4200259.3278.9292.9306.0306.2327.1
4400265.0287.1304.3321.3321.3344.6
4600268.8297.2313.3335.2334.7355.9
4800274.7306.8321.1343.1342.5366.7
5000278.5312.7329.1352.6350.4377.0
5100280.2316.9330.6354.5352.4381.3
5200281.3316.9330.8353.6353.6384.3
5400273.7314.9329.3350.8355.4386.1
5500273.5313.9330.4350.7355.9387.4
5600269.3314.5330.2350.9353.5389.4
5700312.7329.3348.6353.3391.6
5800308.8326.2347.6351.4387.2
6000329.2353.4383.7
6200314.8373.7
Show Less
Torque
RPMPhase 1Phase 2Phase 3Phase 4Phase 5Phase 6
3000324.2342.3349.5361.4361.0375.8
3200320.7338.3351.1362.3362.3376.4
3400322.7347.0359.9371.6371.5388.4
3600328.0348.2368.7380.4379.1402.2
3800326.8350.7368.4382.9382.7412.0
4000327.6351.3367.6383.1383.1409.3
4200324.3348.8366.3382.7382.9409.0
4400316.4342.7363.2383.5383.6411.4
4600306.9339.3357.7382.7382.1406.3
4800300.6335.7351.4375.4374.8401.3
5000292.6328.5345.7370.4368.1396.0
5200284.1320.1334.1357.2357.1388.1
5400266.2306.3320.3341.2345.6375.5
5600252.6295.0309.7329.1331.7365.2
5800279.6295.4314.8318.2350.6
6000288.1309.3335.8
6200266.7316.6
Click to expand...
I linked to this same article earlier in this string. Pretty amazing results!
 
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