Pontiac 265 350 400 455 1.65 Ratio 7/16" Stainless Steel Roller Rocker Arms This Speedmaster LowRise manifold is

This Speedmaster LowRise manifold is a direct replacement for the stock manifold on 1957-95 Small Block Chevy non-EGR engines

Aggressive

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They also offer the potential for improved fuel economy by making the engine more efficient

Pontiac 265 350 400 455 1.65 Ratio 7/16" Stainless Steel Roller Rocker Arms This Speedmaster LowRise manifold isNOTE: 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.