Jim Miller

TECH-LINE

STAGGERED VALVE ARRAY

STAGGERED VALVE ARRAY, in cylinder heads refers to the offsetting of the intake and exhaust valves with each other, when viewed from the end of the cylinder head. Here, each valve is tilted on 1 axis (Y-Axis). Each valve is laid over 2 degrees, on the Y-Axis (Width of head), and the X-Axis (Length of head) is NOT leaned; but is shown 90 degrees to the cam's axis.

The rocker arm's axis must be KEPT PARALLEL to the CAM's AXIS on these type of valve arrays, that are still STUD mounted. More complex shaft systems can find an alternate 3rd angle, but their efficiency is not improved in doing this.

There is never any time a rocker arm should be twisted on the stud, unless the stud has been positioned on a compound geometry to work with the compound geometry of the valve. The above is NOT a compound geometry valve array. In fact, this STAGGERED Valve array falls under the same rules for keeping the rocker's axis parallel to the cam, as the in-line valve array of a small block Chevrolet or Ford.

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