Vortec 8100 / 496cid 2.9L Twin Screw Supercharger Kit

Get ready to make big power with the all-new 2.9L twin screw Whipple supercharger kit only available from Raylar! This tuner kit makes 8lbs of boost with the supplied 3.375 pulley. Up to 12lbs of boost is possible with a simple pulley upgrade.

The 2.9L supercharger produces excellent horsepower and torque in a universal tuner kit that fits under most stock hoods. Expect incredible acceleration and top end power with a flat, towing-friendly torque curve. Twin screw superchargers deliver boost more efficiently than other supercharger systems and provide instant boost at the touch of the throttle.

Our superchargers feature an integrated bypass valve which virtually eliminates parasitic loss under light throttle and improves fuel mileage potential. The 2.9L supercharger features a self-contained lubrication system for ease of install. Upgrade to an oversized integrated heat exchanger and a massive air-to-water intercooler which offers more intake air cooling than any other positive displacement supercharger system available.

The 2.9L supercharger tuner kit does not include fuel pump upgrades, computer program or tuner.

What's Included In The Kit?

Why Whipple Twin-Screw Superchargers?

Twin screw superchargers make more power per pound of boost. The compression sequence inside the supercharger continues on all rotor segments simultaneously.

twin screw supercharger 8.1L engine

Inlet Phase – The male and female rotors rotate counter to each other. As the lobes of each rotor travel past each inlet port, air is trapped between consecutive lobes and the cylindrical casing. The air moves forward through the supercharger case and filling the inner-lobe space between adjacent lobes.

Compression Phase - As the rotors mesh, the air is trapped between the rotors and the casing. Continued rotation progressively reduces the space occupied by the air causing compression.
Discharge Phase - Compression continues until the inner-lobe space becomes exposed to the discharge port at the bottom of the supercharger, forcing air into the manifold.

  Twin-Screw Centrifugal Roots
Response Idle-to-Redline Midrange-to-Redline Low-to-Midrange
Driveability Increased power throughout rpm range. Must downshift to maintain boost level. Increased low and mid-range power.
Torque Curve Strong torque delivery at any rpm. Poor low rpm torque output. Power fall-off at higher engine speeds.
Heat Buildup Low; intercoolers are usually not needed. Low; intercoolers are usually not needed. High; limits boost available.
Noise Low noise levels. Typically very noisy. Typically very noisy.
Efficiency 70-85% 60-80% 30-65%


vortec 8100 8.1L 496 supercharger
2.9L Supercharger Tuner Kit - $7999

The 2.9L supercharger kit makes 8lbs of boost and is good for 600hp / 690ft-lbs with stock cylinder heads, 202 camshaft and a forged rotating assembly. Our aluminum heads, stroker kits, larger camshaft options and smaller pulley diameters allow you to make substantially more power.

  • 2.9L Twin Screw Whipple Supercharger
  • Supercharger Discharge Manifold & Gasket
  • Intake Manifold Base & O-ring
  • Internal Water To Air Heat Exchanger
  • Fuel Rails & 60lb Fuel Injectors
  • Intercooler Water Pump Motor Relay & Wiring
  • 3 Bolt Throttle Body Adapter
  • IAT Sensor & Extension Connector
  • Air Filter, Plastic Intake Tube & Couplers
  • Belts, Tensioners, Idler Plulley Drive Assembly
  • Tensioner Plate, Tensioner Plate To Water Pump & Cylinder Head Spacers
  • 3.375" Supercharger Pulley, Other Pulleys Available From Whipple
  • #10 Fittings For Coolant Discharge Hoses
  • #10 45 Degree Coolant Hose Fitting
  • 9) 8mm x 30 Supercharger Mounting Bolts
  • Internal Air Bypass Vacuum Hose
  • Supercharger Pulley Bolts
  • PVC Fitting For Lower Manifold
  • 3/4" Coolant Hoses
  • 3/4" Shrinkable Hose Clamps
  • 3/8" High Pressure Fuel Hose
  • Supercharger Lubricating Oil
  • Assorted O-rings For Assembly
  • Assorted Assembly Bolts
  • Black Finish Standard, Polished Available At Extra Charge
vortec 8100 8.1L 496 supercharger intercooler
Intercooler / Heat Exhanger Upgrade - $1599

Keep your intake charge cool and run more boost with less detonation with our heat exchanger / massive 5L intercooler upgrade.

  • 5L Intercooler / Heat Exchanger
  • Coolant Pump & Resorvoir
  • Brackets & Hoses
vortec 8100 8.1L 496 supercharger throttle body upgrade
90mm Throttle Body Upgrade - $849

Make more power with our LSA throttle body upgrade.

  • 90mm LSA Throttle Body
  • 3 Bolt To 4 Bolt Throttle Body Wiring Adapter
raylar 8.1l 496 forged rotating assembly for superchargers
Raylar 511cid Stroker Kit - $2969

Our 4.5" stroke crankshaft, forged h-beam connecting rods and forged pistons are direct replacement parts for your stock Vortec rotating assembly.

  • (511cid stock bore / 518cid 0.030 over)
  • Marine / Street / RV Applications
  • 4.5inch Stroke Forged Crankshaft
  • Forged H-beam Connecting Rods
  • Forged Flycut Pistons
  • Rings & Wristpins
raylar 8.1l 496 forged stroker kit for superchargers
Raylar 540cid Stroker Kit - $3269

Build the ultimate stock-block stroker! Our 4.75" stroke crankshaft, forged h-beam connecting rods and forged pistons replace your exisiting rotating assembly pumping up your displacement to 8.8L / 540cid! Requires block clearance work to fit in stock 8.1L engine blocks.

  • (540cid stock bore / 547cid 0.030 over)
  • Street / RV Applications Only
  • 4.75inch Stroke Forged Crankshaft
  • Forged H-beam Connecting Rods
  • Forged Flycut Pistons
  • Rings & Wristpins
vortec 8100 8.1L 496 performance cnc cylinder heads
Big Power CNC Aluminum Cylinder Heads - $2995

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
8.1 vortec supercharger street kit
*Raylar supercharger kits require forged rotating assemblies for boost over 4-5 PSI.

Important: We recommend changing spark to AC DELCO 41-932. Gapped to 0.035-0.040.
Important: The minimum fuel octane requirement is 91 octane or higher! Warning: If lower than 91 octane fuel is present in the vehicle, it is mandatory to drain the fuel tank completely and re-fill with 91 octane to 1/8th of a tank.

Want Even More Power?

Vortec 8100 / 8.1L 496cid Pistons

stock vortec mercruiser piston damage

The stock Vortec 8.1L cast pistons are not designed to withstand the forces of extreme endurance use, especially in supercharged applications. We routinely see engines with cracked, chipped and even shattered pistons which result in catastrophic engine damage.

Our supercharger kits require forged rotating assemblies for boost over 4-5 PSI.

Big Power - A More Complete Burn

We've gone to great lengths to make improvements over the stock cast iron Vortec cylinder head. Our combustion chambers promote a more even burn, increasing engine efficiency, fuel mileage, improving driveability and reducing detonation in supercharged applications.

How Much Air Do Raylar Heads Flow?

Raylar big block Chevy / GMC cylinder heads out flow every 8.1L cylinder head on the market. Below are flow numbers for our standard Raylar CNC heads and our special-order CNC Extreme cylinder heads. We’ve included the Dart Iron Eagle 8.1L cylinder head in both 4.5 and 4.26 bores for comparison.

Cylinder Head Flow Comparison

Supercharger Camshafts

Low Lift Cams For Stock Cast Iron Heads

BP-202 Towing / RV Camshaft
High torque camshaft. Stock-like idle. Best for daily towing emissions compliant Truck / RV use under 8000lbs. Safe for stock cylinder heads. Powerband: Idle - 4700rpm

BP-203 Street / Strip Camshaft
Street / strip camshaft. Mild lope at idle, excellent daily driver camshaft for Trucks and SUVs. Great power throughout power band. Best for towing applications under 8000lbs. Safe for stock cylinder heads. Powerband: 1400rpm - 5200rpm

BP-111-S Supercharger Camshaft
650SRC low lift supercharger camshaft for stock cylinder heads. Mild lope at idle, excellent daily driver camshaft for Trucks and SUVs. Powerband: 1200rpm - 5600rpm

High Lift Cams For Aluminum Heads

BP-207-S Supercharger Camshaft
800SRC high lift supercharger camshaft, must use Raylar forged pistons. Mild lope at idle, excellent daily driver camshaft for Trucks and SUVs. Powerband: 1800rpm - 6000rpm

BP-206 Max Effort Camshaft
Max effort stock displacement camshaft. Choppy idle. 2500rpm stall recommended. High lift, must use Raylar forged pistons. Works very well with our stroker kits. Powerband: 2200rpm - 5800rpm

BP-213 Race Camshaft
Extreme / race camshaft. Very choppy idle. 3000rpm stall recommended. High lift, must use Raylar forged pistons. Great for all-out stroker applications! Powerband: 2800rpm - 6100rpm



raylar supercharger 8.1L cad design

whipple 8100 vortec supercharger kit

Notice: Installation of Raylar / Whipple supercharger products signifies that you have read this document and have agreed to the terms stated within. It is the purchasers responsibility to follow all installation instruction guidelines and safety procedures supplied with the product as it's received by the purchaser to determine the compatibilty of the product with the vehicle or the device the purchaser intends to install the product on. Whipple superchargers / Raylar assumes no responsibilty for damages occouring from accident, misuse, abuse, improper installation, improper operation, improper programming or computer tuning, lack of reasonable care or all previously stated reasons resulting from imcompatibility with other manufacturer's products. There are no warranties expressed or implied for engine failure or damage to the vehicle in any way, loss of use or inconvenience or labor reimbursement. This includes merchantability and fitness.