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Old 10-13-2013, 03:44 PM
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voodoo cam vrs. comp cams

H guys I have a 1965 nova with 3.73 gears 350 turbo trany, 2000rpm stall the motor is a 350 with rhs 67 cc pro torquer heads, with about 9.6-1 compresion. it is a weekend show car and fri nightr street class drag. I am trying to pick a better cam than the he268 that is in it. I am torn between the xe268 or the voodoo 262 i have herd that the voodoo out perform the xe series and i want the best upgrade. any help would be great thanks

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Old 10-13-2013, 04:26 PM
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The voodoo series is a little better but I agree your converter is where you'll see the biggest difference. The exhaust, intake, tune,etc all probably need attention before your cam does.
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Old 10-13-2013, 04:52 PM
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I have to agree with F-BIRD about the looser converter.
The motor has the perfect cam in it for the static compression ratio of 9.6:1. The intake valve closes at 35 degrees after bottom dead center, creating a dynamic compression ratio of 8.455:1, perfect for best power on pump gas.

More cam will make the bottom end even soggier and you don't need more cam unless you intend to increase the static compression ratio too. Right now, you have the perfect balance of cam to compression ratio. And in the name of all that is holy, do not install one of those fosdick XE cams in a street motor. You're just asking for trouble. If you were racing in a class where you needed an extra 10 horsepower to drive around your competition, then I'd say yeah, use the XE. But for the street, the increased hydraulic intensity creates a shaky proposition.

Change converters and do some in-depth tuning on the motor. Here is a first step for you, finding top dead center on the damper so you can time the motor with a light and know that what you're seeing is correct.
http://www.crankshaftcoalition.com/w...op_dead_center

Last edited by techinspector1; 10-13-2013 at 05:03 PM.
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Old 10-13-2013, 05:56 PM
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agree with all the above posters.I had a 65 Acadian when I was in school,loved the car,but it handled absolutely horrible.(back then we used bias ply tires) The lower control arms need to be reinforced or replaced with a front clip with better suspension and brakes.No reason for that car not to run low 12s. I would love to have another one of those cars and build a snotty 283 for it
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Old 10-13-2013, 06:09 PM
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thanks guy. I thought i should mention that the engine has shim gaskets and a little head work, stealth intake 750 holley, vac sec, headers, 2 1/2 duals, when i purchased the stall i was told it was a 2500 stall, but at the track all i can hold back before the tires cut loose is 2000rpm, i am runinf bfg drag radials at 17psi, and runing 8.6 on the 1/8 with 1.90 60ft time I want to do the voodoo 262 cam but is it going to be an improvement over what i have. I am also not trying to build the fastest car around just bake it the best i can with what i have will mild modes, I realy dont want to change the stall, and was hoping that the voodoo would just make it a little better I have the intake off so I thought it would be a good time to change, do you guys think the voodoo 262 would be a good invesment or waste of time and monie thanks
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Old 10-13-2013, 06:10 PM
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Quote:
Originally Posted by F-BIRD'88 View Post
You will gain more from changing the torque converter, than changing the camshaft.

Change the stock 2000 stall to a 10" 3500+ stall converter. And get some sticky tires.
just wondering how streetable is a 10'' 3500 stall and what sort of problems should you expect to encounter with daily street use?
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Old 10-13-2013, 06:19 PM
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Quote:
Originally Posted by 65novablu View Post
thanks guy. I thought i should mention that the engine has shim gaskets and a little head work, stealth intake 750 holley, vac sec, headers, 2 1/2 duals, when i purchased the stall i was told it was a 2500 stall, but at the track all i can hold back before the tires cut loose is 2000rpm, i am runinf bfg drag radials at 17psi, and runing 8.6 on the 1/8 with 1.90 60ft time I want to do the voodoo 262 cam but is it going to be an improvement over what i have. I am also not trying to build the fastest car around just bake it the best i can with what i have will mild modes, I realy dont want to change the stall, and was hoping that the voodoo would just make it a little better I have the intake off so I thought it would be a good time to change, do you guys think the voodoo 262 would be a good invesment or waste of time and monie thanks
Again, you don't need more cam, you need more converter to get the motor up on the cam that you have now. You can change the converter in an afternoon with the help of a buddy. Don't be swayed by names like Voodoo and Extreme Energy. Those names were originated by marketing experts who depend on fancy sounding names to relieve you of your hard-earned dough. For the last time....keep the cam you have and change the converter.

Last edited by techinspector1; 10-13-2013 at 06:34 PM.
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Old 10-13-2013, 06:28 PM
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reread post #4 and #5
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Old 10-13-2013, 06:32 PM
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Quote:
Originally Posted by jtz55 View Post
just wondering how streetable is a 10'' 3500 stall and what sort of problems should you expect to encounter with daily street use?
The motor only goes to the stall limit of the converter when you have the loud pedal matted against a resisting force. Otherwise, there is little difference between a stock converter and a loose converter when light pedal is applied, as in tooling around town.

But you will need additional cooling for the transmission fluid. Come out of the trans to a front-mounted auxiliary cooler, out of the cooler and into the bottom of the radiator, out of the radiator and back to the transmission. Running through the auxialiary cooler last will likely cool the fluid too much. ATF needs some heat in it to operate properly, so cool it down with the auxiliary cooler, then put the proper heat back into the fluid by passing it through the cooler on the bottom of the radiator.

Do not try to mount the auxialiary cooler anywhere but in the front of the car and in the airstream. Many fellows have cooked their transmissions by mounting a cooler back under the car somewhere with a fan attached. Some have gotten away with it, but many have failed.
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Old 10-13-2013, 06:43 PM
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Quote:
Originally Posted by F-BIRD'88 View Post
If you only want to see a small change. just move the camshaft you got.
EG:
Retard to true straight up ='s more top end horsepower.

Advance it further to say a 102 intake C/L ='s more torque at launch.

I see a easy 4/10th to 1/2 sec improvment in a new real deal 3500+ stall 10" converter,
proper tire pressure (14psi) and traction bars.
Using the camshaft you got.
I agree 100%.
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Old 10-14-2013, 04:46 AM
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thanks for the info. the mpr is 83 mph and i already have the 3 link kit installed, and I guess i have realy no clue what my stall is if every time I run it I hold it aganst the brake at about 2000. I will try it on the street dont know how acurat it will be becuase the track is closed for the seson. do you guys think that the stall is higher than 2000 because of my incorect launge method. I was told it was 2500. thanks again
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Old 10-14-2013, 07:04 AM
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Quote:
Originally Posted by 65novablu View Post
thanks for the info. the mpr is 83 mph and i already have the 3 link kit installed, and I guess i have realy no clue what my stall is if every time I run it I hold it aganst the brake at about 2000. I will try it on the street dont know how acurat it will be becuase the track is closed for the seson. do you guys think that the stall is higher than 2000 because of my incorect launge method. I was told it was 2500. thanks again
You cannot calculate "stall" speed by doing a brake torque. Converters are labeled as "stall" but in reality this is the "flash" rpm. Flash RPM is much different than a true brake torque "stall". Flash is what your RPM MAY reach during a WOT launch. It's just a flash, and NOT where your rpms will loiter for any length of time. Also, this advertised stall rpm is based upon the maximum rated torque of the converter. If the converter is rated to withstand 700lb/ft of torque and your engine produces 450lb/ft, you will not come close to the advertised FLASH rpm of the converter.

I use a 3000 rpm converter in a 4000# truck with 475 HP and 495lb/ft of torque. It works perfectly for street use. Remember, the lighter the vehicle, the looser the converter can be.
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Old 10-14-2013, 04:44 PM
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I've been looking into the VooDoo & XE cams also.I've never used an XE.I have used a VooDoo.FWIW,from what I've found out,for a street car,my choice would be the VooDoo.If both cams have the same adv & @ .050 #'s the VooDoo supposedly will make slightly more torque in the lower RPM range.So slight that on a street engine,you wouldn't be able to tell.Where the VooDoo cam wins is,although similar to the XE,it is somewhat quieter & easier on the valve train than the XE.
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