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We used 1.6 ratio rockers and reused the gaskets that had already been compressed from the X heads for taking measurements. What we came up with was .05 (.04-.06 for all eight pistons) clearance on the intake valve. We measured each intake valve several times because we couldnt beleive we had a problem. Only thing I can figure is that because my engine is a 2006 model, the forged pistons do not have the releif in the pistons as deep as the hypertectic pistons. Also measured with the old X head installed and came up with about .08 on the intake (I think).
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