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INSTALLATION NOTE: Edelbrock head gasket sets recommended. Complete cylinder heads are assembled and prepared for installation right out of the box. Recommended spark plugs are Champion RC12YC or equivalent 14mm x 3/4" reach with flat gasket seat. Use Edelbrock Step Washer Kit #9693 on 1967-69 engines with 7/16" head bolts. Deck thickness: 5/8", rocker stud diameter: 3/8", pushrod diameter: 5/16" (width of slot in guide plate).