This is the O.S. Max .21 VZ-B V-Spec-T (P) Off-Road 1/8 scale Racing Engine.  This is ideal for Mugens, Infernos, and truggies.

Features:

• Hardened, chrome-plated, 4-port, cylinder and liner for high durability and long life
• Machined steel piston features parallel rings that trap fuel oils and use them as a seal to enhance compression and boost power
• Reshaped crankcase core ensures smoother air flow and more consistent performance
• Slide Valve Carburetor with 8mm and 9mm Carb restrictors allow tuning to specific track conditions
• Low-end Needle adjusts from side to side for maximum adjustment ease
• V-shaped two-piece turbo head design provides fast heat dissipation

Includes:
One .21 VZ-B V-Spec-T (P) racing engine w/21J carburetor
One P3 Ultra Hot Turbo plug
One instruction manual w/OS decal
One extra head shim/gasket(The other gasket is pre-installed)
One 8mm carb restrictor
One 9mm carb restrictor
One exhaust port seal ring
Two carb rubber gaskets
One carb cover
One exhaust cover

Specifications:
Practical RPM:      3000-40,000
Output:             2.48 bhp @ 33,000 RPM
Bore:               0.654in
Stroke:             0.630in
Weight w/o Muffler: 12.7oz (360g)

Height from crankcase bottom to top of cylinder head: 110.6mm (4.4")
Height/crankshaft center to top of cylinder head:      95.3mm (3.8")
Width including mounting ears:                           45mm (1.8")
Width not including mounting ears:                     30.8mm (1.2")
Width between mounting holes same side:                  21mm (.83")
Width between mounting holes opposite side:              37mm (1.5")
Cylinder head diameter:                                57.2mm (2.3")
Length of exposed pilot shaft/crankshaft:              29.6mm (1.17")
Internal thread size at end of crankshaft:                3mm

Note: Because this is a high-performance racing engine, this does not have a warranty