Pontiac 265 350 400 455 1.65 Ratio 7/16" Stainless Steel Roller Rocker Arms They are built from strong

They are built from strong

Fits big block Chevy rectangular port cylinder heads on standard deck blocks

they utilize a cotton gauze with aluminum mesh construction

Made from 5051 aircraft aluminum alloy

Pontiac 265 350 400 455 1.65 Ratio 7/16" Stainless Steel Roller Rocker Arms They are built from strongNOTE: You need Studs and Guide Plates to Run Roller Rockers . Speedmaster 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.