Moroso Performance Stud Girdles Hex Head Adjusting Nuts Features: For Use w/Moroso Stud Girdles Hex Head Design Allows Easier Valve Adjustments w/A Set Screw Providing A Positive Lock Fits Either Stock Or Roller Rockers Four Per Pack Height: 0.88 Width: 5.38 Length: 7.19 Weight: 0.81 lbs Fitment: CHEVROLET 1966 - 1969 427 BIG BLOCK For BBC Intake Manifolds 1970 - 2000 454 BIG BLOCK For BBC Intake Manifolds 1985 - 2010 502 BIG BLOCK For BBC Intake Manifolds 1970 - 2000 540 BIG BLOCK For BBC Intake Manifolds 1970 - 2000 555 BIG BLOCK For BBC Intake Manifolds 1970 - 2000 565 BIG BLOCK For BBC Intake Manifolds 1970 - 2010 632 BIG BLOCK For BBC Intake Manifolds