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Energizer Rocker Arms Chevrolet (Formerly Hi-Intensity Rocker Arms) Die Formed Aluminum Body with Needle Bearing Fulcrum and Roller Tip. Needle bearing fulcrum and roller tip reduces friction, lowers engine oil temperature, improves response, increases HP and RPM. Aerospace vacuum die-formed aluminum main body offers extreme strength and light weight. Great for street and moderate race use. Die-formed aluminum body is larger than stock, may require modifications to stock valve covers for clearance. Cannot be used with late Chevy 90° V-6 and small-block V-8 "Center Bolt" valve covers. Will not fit 90° V-6 or small-block V-8 self-aligning 88-99 heads.

Part # Description Ratio Stud Diam. Price/Set CHEVROLET 90° V-6 78-87, 200 THRU 262 11747-12 INCREASED RATIO WITH ENLARGED STUD DIAMETER THE 1988-99 ENGINES EQUIPPED WITH SELF-ALIGNING ROCKER ARMS REQUIRE THE INSTALLATION OF PUSHROD GUIDEPLATES (AND 99157-16 7/16" ROCKER ARM STUDS, IF APPLICABLE) AND APPROPRIATE HEAT TREATED PUSHRODS IN ORDER FOR THESE ROCKER ARMS TO FUNCTION PROPERLY. VALVE COVER CLEARANCE MUST ALSO BE CHECKED. NOT SUITABLE FOR USE WITH CENTER-BOLT VALVE COVERS. 1.6 7/16" $199 11746-12 INCREASED RATIO WITH STANDARD STUD DIAMETER THE 1988-99 ENGINES EQUIPPED WITH SELF-ALIGNING ROCKER ARMS REQUIRE THE INSTALLATION OF PUSHROD GUIDEPLATES (AND 99157-16 7/16" ROCKER ARM STUDS, IF APPLICABLE) AND APPROPRIATE HEAT TREATED PUSHRODS IN ORDER FOR THESE ROCKER ARMS TO FUNCTION PROPERLY. VALVE COVER CLEARANCE MUST ALSO BE CHECKED. NOT SUITABLE FOR USE WITH CENTER-BOLT VALVE COVERS. 1.6 3/8" $199 11744-12 STOCK RATIO AND STANDARD STUD DIAMETER THE 1988-99 ENGINES EQUIPPED WITH SELF-ALIGNING ROCKER ARMS REQUIRE THE INSTALLATION OF PUSHROD GUIDEPLATES (AND 99157-16 7/16" ROCKER ARM STUDS, IF APPLICABLE) AND APPROPRIATE HEAT TREATED PUSHRODS IN ORDER FOR THESE ROCKER ARMS TO FUNCTION PROPERLY. VALVE COVER CLEARANCE MUST ALSO BE CHECKED. NOT SUITABLE FOR USE WITH CENTER-BOLT VALVE COVERS. 1.5 3/8" $199 11745-12 STOCK RATIO WITH ENLARGED STUD DIAMETER THE 1988-99 ENGINES EQUIPPED WITH SELF-ALIGNING ROCKER ARMS REQUIRE THE INSTALLATION OF PUSHROD GUIDEPLATES (AND 99157-16 7/16" ROCKER ARM STUDS, IF APPLICABLE) AND APPROPRIATE HEAT TREATED PUSHRODS IN ORDER FOR THESE ROCKER ARMS TO FUNCTION PROPERLY. VALVE COVER CLEARANCE MUST ALSO BE CHECKED. NOT SUITABLE FOR USE WITH CENTER-BOLT VALVE COVERS. 1.5 7/16" $199 CHEVROLET V-8 55-87, 262 THRU 400 11747-16 INCREASED RATIO WITH ENLARGED STUD DIAMETER THE 1988-99 ENGINES EQUIPPED WITH SELF-ALIGNING ROCKER ARMS REQUIRE THE INSTALLATION OF PUSHROD GUIDEPLATES (AND 99157-16 7/16" ROCKER ARM STUDS, IF APPLICABLE) AND APPROPRIATE HEAT TREATED PUSHRODS IN ORDER FOR THESE ROCKER ARMS TO FUNCTION PROPERLY. VALVE COVER CLEARANCE MUST ALSO BE CHECKED. NOT SUITABLE FOR USE WITH CENTER-BOLT VALVE COVERS. 1.6 7/16" $215 11746-16 INCREASED RATIO WITH STANDARD STUD DIAMETER THE 1988-99 ENGINES EQUIPPED WITH SELF-ALIGNING ROCKER ARMS REQUIRE THE INSTALLATION OF PUSHROD GUIDEPLATES (AND 99157-16 7/16" ROCKER ARM STUDS, IF APPLICABLE) AND APPROPRIATE HEAT TREATED PUSHRODS IN ORDER FOR THESE ROCKER ARMS TO FUNCTION PROPERLY. VALVE COVER CLEARANCE MUST ALSO BE CHECKED. NOT SUITABLE FOR USE WITH CENTER-BOLT VALVE COVERS.  1.6 3/8" $215 11744-16 STOCK RATIO AND STANDARD STUD DIAMETER THE 1988-99 ENGINES EQUIPPED WITH SELF-ALIGNING ROCKER ARMS REQUIRE THE INSTALLATION OF PUSHROD GUIDEPLATES (AND 99157-16 7/16" ROCKER ARM STUDS, IF APPLICABLE) AND APPROPRIATE HEAT TREATED PUSHRODS IN ORDER FOR THESE ROCKER ARMS TO FUNCTION PROPERLY. VALVE COVER CLEARANCE MUST ALSO BE CHECKED. NOT SUITABLE FOR USE WITH CENTER-BOLT VALVE COVERS. 1.5 3/8" $215 11745-16 STOCK RATIO WITH ENLARGED STUD DIAMETER THE 1988-99 ENGINES EQUIPPED WITH SELF-ALIGNING ROCKER ARMS REQUIRE THE INSTALLATION OF PUSHROD GUIDEPLATES (AND 99157-16 7/16" ROCKER ARM STUDS, IF APPLICABLE) AND APPROPRIATE HEAT TREATED PUSHRODS IN ORDER FOR THESE ROCKER ARMS TO FUNCTION PROPERLY. VALVE COVER CLEARANCE MUST ALSO BE CHECKED. NOT SUITABLE FOR USE WITH CENTER-BOLT VALVE COVERS.  1.5 7/16" $215 CHEVROLET V-8 65-90, 396-402-427-454-502, ALSO 91-00 454-502 GEN V AND VI 13744-16 STOCK RATIO AND STANDARD STUD DIAMETER THE 1991 AND LATER GEN V AND VI ENGINES REQUIRE THE INSTALLATION OF 99152-16 7/16" ROCKER ARM STUDS (NO MACHINING REQUIRED) AND FACTORY PUSHROD GUIDEPLATES. FOR APPLICATIONS WITH OVER 480 POUNDS OPEN VALVE SPRING PRESSURE, THE CYLINDER HEADS MUST BE MACHINED FOR THE INSTALLATION OF 99157-16 7/16" ROCKER ARM STUDS AND 13650-1 PUSHROD GUIDEPLATES.     1.7 7-16" $215

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