*One-Piece Guide Plates* * Designed using stereo lithography techniques for accurate fit; hardened and black oxide finished * Feature exact stud placement and rounded contact points * Necessary for high lift/spring pressure environments of performance engines *Two-Piece Adjustable Guide Plates* * Available for Small and Big Block Chevy and Small Block Ford applications * Designed for use on cylinder heads with relocated intake ports * Big Block Chevy application designed for use with RHS or other aftermarket heads with relocated intake ports * Able to be welded after final adjustment (SBC and SBF only); BBC is bolt-together design * Contoured & clearanced for head bolts PartNumber : cca4811-1 Description : Two-Piece, Adjustable Guide Plates; Raised Style; Requires 7/16" Stud Base Thread; Single Piece Title : 4811-1 Guide Plate, CB 3/8" Raised (adjustable) Adjustable : Yes California Proposition 65 : WARNING: This product contains a chemical known to the State of California to cause cancer, birth defects or other reproductive harm. Engine Family : Chevrolet 396-454 Big Block Pushrod Diameter : 3/8 Stud Diameter : 7/16 Type : Raised Stud Diameter : 7/16" Push Rod Size : 3/8" Engine Components::Guide Plates