Chevy BBC 454 1.7 Ratio 7/16" Ultra Black Chromoly Roller Rocker Arms Set you must use one that

you must use one that is also approved as street legal for your application

on dedicated cam-grinding machines

These computer-machined brackets are manufactured from high quality materials and come with a chrome finish

and they may be reduced to fit if you decide to narrow your rear-end later on

dual plane fuel injection intake manifolds allow the installation of dual throttle bodies on late model LS Series engines

Chevy BBC 454 1.7 Ratio 7/16" Ultra Black Chromoly Roller Rocker Arms Set you must use one thatSpeedmaster roller rockers are available in various ratios, so you are good to go. They feature greater strength and durability, capable of withstanding valve spring load. .