Valve Spring Tech - Rev Happy
The height mic revealed that we had 1.870 inches of available spring room. We then had to subtract 0.060 inch for spring seats, which protect the aluminum head from the valvespring and also positively locate the spring. This left us with 1.810 inches, and Brul went with this as our installed height. Why? Subtracting 0.620 inch for our cam's exhaust lift left 1.190 inches. Coil bind happens at 1.085 inches, which left us with a near-perfect 0.105-inch clearance.
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