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Old 03-17-2007, 12:29 AM
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Will I Break It???

To all you engine builders out there....
I have a '72 Slant Six with a 264dur./.480 lift cam. Solid grind. Hydrolic Intensity is higher than a CompCam Mag. 292 Chevy grind. The springs are 110-120 seat and 300-310 open pressure.
Assuming I use a good oil(I'm aware of all the oil/zinc applications), and follow a good break-in procedure......what are my chances of wiping a lobe on initial start-up? They are dual springs, and I was considering running without the inner, just to be a little easier on my valve-train. But I don't wan't my lifters doing a line-dance because of too little pressure. This car will be driven everyday. Springs were recomended by Schneider Racing, but I'm nervous that these springs are biased toward racing.
Thanks for any help!
BBBanjo

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Old 03-17-2007, 12:55 AM
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If it were my motor, I'd use stock springs for break-in and change 'em out for the good ones later. That is, after I squeezed 'em in a vice to the installed height and then squeezed 'em another 0.480" to make sure they wouldn't coil bind. After they're squeezed down all the way, slide a 0.010" feeler gauge between the coils. Once they're on the motor, check for 0.060" to 0.120" clearance between the bottom of the retainer and the top of the valve guide.

Last edited by techinspector1; 03-17-2007 at 01:04 AM.
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