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Old 12-12-2005, 12:24 PM
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Cam LSA vs. altitude

I'm seeking some "real world" opinions to go with theoretical information I've been told.
I live at 5000+ feet elevation, and within an hour can be at over 10,000 feet for a beautiful day's cruise.
It has been suggested to me that a wider LSA will help improve performance at these elevations.
Eventually I wish to install a TPI induction, but for the forseeable future, I'll be running my OEM 750 cfm (I assume) Quadrajet.
The car is a '73 Vette L-48 350 cid with TH400 and 3.08 rear end. Upon rebuild, it will have AFR 180 /74cc chamber heads, 9.75+/- compression, Hedman headers, 2 1/2" X-pipe exhaust and MSD 6A ignition.
The cam I am considering is the CC HE268, 218* @ .050, .454" lift but with a custom LSA of either 112* or 114*, instead of the standard 110*.
The 114* is my definate choice for the TPI, but now I am not sure when that will come to pass....
Will the 114* still be OK with a carb? Will it be a better choice because of the elevation? Or would a compromise to the 112* work better for carb, then TPI, at my elevation? (My OEM Chevy cam has a 114* LSA)
Thanks for your thoughts.....

John

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Old 12-12-2005, 03:20 PM
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"Real world", it is not going to make a pinch of poop difference with that small of a camshaft. In general spreading the lobe center will smooth out the powerband, although not suggesting it will make more power, although it may pull a tad longer on top. I would suggest sticking to the 110 LDA.
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Old 12-12-2005, 04:03 PM
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Dont really have much info to provide for you other than that I run a 112LSA camshaft in my TPI and it does just fine. I know of some people running a 110 setup. It requires more tuning but is definitely possible.
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Old 12-12-2005, 05:40 PM
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I run a 110 on my 434 motor.
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