Manganese bronze is the guide material of choice for performance heads because it carries heat away from the valve stem better than cast iron and tolerates the side loading that comes with higher spring pressures. This is a straight, non-tapered guide at 0.335 in. inside diameter, usable in either intake or exhaust positions, sold one at a time so you order exactly what the head needs.

Edelbrock 9701 Valve Guide Specifications:

• Manganese bronze construction, natural finish.
• 0.335 in. inside diameter, 0.5450 in. outside diameter.
• 2 in. length, non-tapered.
• Suits intake and exhaust positions in performance cylinder heads.
• Sold individually. Installation requires machine work to size and finish the guide.