Pontiac 265 350 400 455 1.52 Ratio 7/16" Aluminum Roller Rocker Arms Speedmaster CNC ported cylinder heads

Speedmaster CNC ported cylinder heads are machined on dedicated 5-axis CNC machines to ensure accuracy and better flow

Speedmaster 4340 Billet Steel crankshafts are manufactured from high quality true billet round bar stock

Speedmaster starter shim kits are designed to ensure that you have the proper gap between the starter and flywheel

Speedmaster aluminum crankshaft pulleys are manufactured from 356 aluminum that is heat-treated to T-6 specs

They feature extra-thick steel that's double-welded to the ring gear for added strength and anodized for corrosion resistance

Pontiac 265 350 400 455 1.52 Ratio 7/16" Aluminum Roller Rocker Arms Speedmaster CNC ported cylinder headsSpeedmaster 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.