Moroso ROX 4.5 Bore Spacing Cylinder Heads - Engine Builder Magazine

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Moroso ROX 4.5 Bore Spacing Cylinder Heads

Engine Builder
By Engine Builder
Moroso Cylinder Heads

Moroso has introduced Part # 68336, valve covers for ROX 4.5 Bore Spacing cylinder heads, they
clear Jesel & T&D Style Rocker Shaft Assemblies. They are fabricated entirely from superior quality aluminum, ultra-lightweight and are 2-7⁄8″ tall.

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Their one-piece billet rail is CNC machined to ensure a precision flat surface for superior sealing. Mating of the billet rail to the valve cover is done with a smooth transition, eliminating trapped oil and spills when removing the cover. Designed with a broad, flat surface for engine builder engraving, they can be polished, chromed, powder coated or left as-is for a race look.

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These pistons are forged from 2618T aluminum alloy and machined on dedicated CNC machine cells to tight tolerances. 2618 aluminum has a lower silicon content than other alloys. That makes the pistons stronger and more ductile—perfect for high-load, high-stress applications like superchargers, turbochargers, or nitrous oxide. 

Other features include:• Rated to handle up to 1,500 horsepower• -21.1cc dish with two valve reliefs• Lateral gas-ported to maintain tighter piston-to-bore clearances for better sealing• 10.5:1 compression on E85 with 1.338-inch compression height• .990-inch chromoly wristpins for use with wire locks• Choice of 4.225- or 4.250-inch bore sizes

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