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Edelbrock uses one-piece, swirl-polished, hardened-tip stainless steel valves with 111/432-inch undercut stems for increased flow. Manganese-bronze guides, hardened ductile iron seats, and two-ring positive oil control seals complete the package. These heads come with valves fully assembled by Edelbrock, along with the proper valve springs allowing up to 6,500 rpm without issues. As you can see here, our intake valves were every bit of 2 inches in diameter.