Vortec 8100 8.1L / 496 engine RAYLAR Big Power CNC Aluminum Cylinder Heads

Raylar Big Power CNC aluminum cylinder heads are engineered to maximize the horsepower and torque of the big block Chevrolet Vortec 8100 8.1L / 496 engine. Typical aftermarket cylinder heads are cast and machined ensure the head surface is flat. In addition to these basic steps, all Raylar Big Power heads are further CNC machined in the valve bowls, combustion chambers, intake ports and exhaust ports. We then port match our cylinder heads, maximizing airflow through the ports. These steps are usually an additional charge with aftermarket head manufacturers, but is standard on our heads.

Raylar uses stainless steel nitrated valves for maximum wear and durability. These valves measure 2.19 / 1.75 and have thinner 11/32 valve stems to enhance airflow. These valves are set in bronze guides for maximum reliability. Our heads come with special high-lift dual valve springs with dampers, built to work with our high-lift series of camshafts and use CNC chromoly retainers. Instead of rubber seals, these heads feature viton valve stem seals for added durability.

These heads work best with our stainless steel roller rockers and self adjusting locking AFN nuts. Raylar cylinder heads are direct replacement bolt-on parts for any 496cid / 8.1L engine. All of our parts fit under the stock valve covers.

Our Big Power CNC aluminum cylinder heads out flow every other cylinder head on the market. Expect huge performance gains across the entire powerband.

• Lightweight A356T56 Alcoa Alloy Aluminum
• Smooth Cast, 5 Axis CNC Centers Machining
• Super Alloy Hardened High Strength Steel Valve Seats
• Manganese Silicon Bronze Valve Guides
• Super Viton In Steel "Top Hat" Valve Seals
• High Flow Necked Stainless Steel EV8 11/32" Valve Stems, Black Nitride Strength Treatment
• Intake Valve 2.19" / Exhaust Valve 1.75"
• Hardened Steel Rocker Arm Studs
• 107cc Combustion Chambers
• 315cc High Velocity Intake Port
• 135cc High Velocity Exhaust Port
• Complete 5 Angle Valve Job For Maximum Flow

NOTE: Estimated shipping 1-2 weeks from Order.