Chevy BBC 454 1.7 Ratio 7/16" Stainless Steel Roller Rocker Arms Set The outer case is made

The outer case is made from 8620 Chrome-Nickel-Moly steel and the case hardened for long life

ensuring a perfect fit and maximum efficiency

and most include bolt-in baffles that can be replaced

To remain street legal with a square bore carb

They are five times stronger and more ridged than stock because they are made from aircraft grade aluminum alloy

Chevy BBC 454 1.7 Ratio 7/16" Stainless Steel Roller Rocker Arms Set The outer case is madeSpeedmaster Stainless steel rollers are manufactured from heat treated stainless steel and alloy steel tip rollers. Speedmaster 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 up to 600lbs.