This is the O.S. Max .21 VZ-R 7-Port Racing Engine Version 2.  This engine was created expressly for 1/8 scale on-road competition.

Features:

• An improved internal crankcase core and re-shaped liner port for better mixture flow
• A button-shaped inner head design to boost high-end RPM
• A piston machined from bar stock for more strength
• More crankcase webbing helps the engine cool better and adds structural strength
• Rear exhaust port is cast as part of the cylinder to improve exhaust flow
• 2-piece turbo cylinder head is designed specifically to work with the new high-performance T-P7 Turbo Plug
• Oversized blue anodized cylinder head for more cooling
• True ABC construction (Aluminum Piston with a Chromed Brass Cylinder) reduces break-in time
• The lightened piston improves cooling and acceleration
• Con rod has lighter, more durable bushing material
• Universal fuel inlet nipple can be repositioned for better access
• Needle valve assembly is encased in a protective sleeve
• Dual crankshaft bearings
• Full linear action of a 20K Slide Valve Carb, for more consistent throttle response throughout the RPM range
• Carburetor stop valve prevents the rotor from sliding too far
• Crankcase backplate has an O-ring for a better seal
• Pilot shaft crankshaft

Includes:
One .21 VZ-R VER. 2 engine with 20K Slide Valve Carburetor
One P7 glow plug
One Head Gasket
Three dust caps
One instruction manual and decal sheet
One rubber exhaust seal

Requires:
Glow Fuel: 5%-30% Nitromethane (10% Recommended) with an oil content
16% or more.
Manifold (Header)
Silicone coupler
Tuned pipe or muffler

Specifications:
Displacement: 3.5cc (.211 cu in)
Bore:          16.6mm (.654")
Stroke:       16.0mm (.630")
Power Output:   2.5 BHP at 34,000 RPM
Practical RPM Range: 3,000 - 42,000 RPM
Crankshaft Thread Size: 1/4-28
Weight:      315.5g (11.1oz)

Note: Because this is a high-performance racing engine, there is no warranty