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Hey guys,

I have this year one crate motor.

https://www.yearone.com/Product/automobilia/ct350pc1

I'd really like to swap in a new cam to improve low-end torque and make it sound a little better. Are there any off-the-shelf cams that you could recommend I could swap in to accomplish this goal? I also don't want to make any other changes to the engine.

TH350, not sure of the converter or rear gear.

Thanks in advance.:)
 

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Year One says they send a dyno sheet with each engine. Perhaps you could post it.

There's a dyno sheet of one of these engines on page 5 of this NastyZ28 thread:
http://nastyz28.com/threads/badazz81z28s-1978-camaro-project.147732/page-5

435 #ft at 3300 rpm
441 #ft peak at 3900 rpm

I don't know what better cam you would install to improve the low end torque.

What about your headers? There are some things to do there that don't involve tearing your engine down.
 

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With those engine specs, if you have poor low end, it is not due to the cam. Look at what gear ratio you have, what torque converter (need at least a 10" 2500), and your tuning of the timing curve. Also what exhaust system do you have?
 

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Mike - 74 Nova Baltimore, MD
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I agree with pockets. I would be looking at the carb tuning and timing curve.

What type of ignition system (distributor and coil) are you using with this engine?
Do you know what your initial timing is set to @ idle (vacuum advance disconnected)?
What is your total mechanical advance?... and at what RPM is it in by?
When connected, is your vacuum advance canister connected to a manifold vacuum source (vacuum @ idle)?... or a timed vacuum source (no vacuum @ idle)?
What is your vacuum reading @ idle?
Pull a coupe spark plugs... what do they look like (color)?

Your torque convertor and rear gear ratio will also effect how your car feels while driving.
 

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I agree with the above posts. If your engine's dyno results are similar to those posted, I would be looking at timing curve, rear end gears, and torque converter stall speed to get the car to behave the way you want it to.

You could use a GPS speedometer app in your cell phone (I use SpeedView), your tachometer (assuming you have one), and an on-line calculator to figure out your rear gear ratio. I like this one:
http://www.gtsparkplugs.com/GearCalc.html

You will have to plug in an estimated rear gear ratio at first, and use trial and error until you hit on the right numbers. But it will be easy to accurately determine your rear gears.

All of that is free.

But I would be addressing ignition timing first. No matter what rear gear/tire combination you have, get the engine to run its best with what you have now.


Tell us about your timing set up.

Gerry
 
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