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Old 03-18-2008, 07:18 AM
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Push Rod Wall Thickness - BBC

I just went to a Expo in Chicago area where a guy from Comp Cams told me in a seminar to use .135" wall thickness push rods when running 3/8" push rods. I'm very sure he said this to me and the class. It was a "trick" that he told all of us in the seminar as a way to improve valvetrain stability and increase performance when running at higher rpm. Makes sense right? He said the weight of the lifters and push rods has no effect on "valve train weight" - so running a "thicker" push rod is ok and recommended. Only the spring, valve, and retainers effect valvtrain weight.

when I got home I looked at their 2007 catalog and saw that their "Hi-Tech" push rods - the most expensive ones, are only available in .080" wall thickness for the 3/8 rods. Not available in .135" wall like he said.

So now I am confused. I went ahead and ordered the "Hi-Tech" push rods because it was their best ones - and the current ones I had were stock junk - so anything was better than what I had.

Anyway, what's the deal. Was he giving me bad information or am I just stupid?

Lee

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Old 03-18-2008, 10:18 AM
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If you do the math then you will see that the oil hole in the pushrod will only be about .100. Personally I wouldn't run that small of an oil channel on a BBC. Typically they have an oiling system that gets just enough oil to the springs as it is. If you are running a cam with enough spring pressure that you feel you need something that tough you should probably just go with a 7/16 pushrod anyways.
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