featured 35.6 mm Ecotec Intake Valves: Curtain Area, Valve Size & Shrouding
What a +0.5 mm intake valve changes geometrically, and why curtain area is not a CFM prediction.
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Ecotec Intake Valve Size Guide: 35.6 mm Heads, Stems & Fitment
Understand head diameter, stem diameter, keeper location and the measurements needed for HF35.6 installation.
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GM Ecotec Intake Valves: Stock vs Performance, Sizes, Materials & Fitment
A complete guide to Ecotec intake valve sizing, HF35.6 geometry, stock and extended tips, flow-bench results, installation and supporting valvetrain parts.
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