This is the Associated Pro 8.0 Nitro Racing Engine. FEATURES: Direct replacement engine for the Associated Monster GT 8.0 Monster Truck, ASCC0392 Pro-Start backplate pre-installed Aluminum body slide valve carburetor SG (pilot) type crankshaft Ten fin anodized aluminum heatsink head INCLUDES: Associated Pro 8.0 Nitro Racing Engine with Pro-Start Backplate, Slide Valve Carburetor and instruction sheet REQUIRES: Fuel: Car Blend, 15-30% ODOP3320 Glow Plug: Medium/cold for 1/8 scale applications Air filter kit: ASCC5730 SPECS: Displacement: .50 cu in (8.0cc) Specs such as horsepower, bore and stroke were not provided by manufacturer Carburetor Settings- High Speed Mixture: Three turns counter clockwise from closed Low Speed Mixture: Five and one half turns counterclockwise from closed Idle Speed: Turn screw until throttle opening inside throttle valve is .050" (1.3mm) Weight: 14.5oz (410g) Distance Between Mounting Hole Centers Same Side: 0.67" (17mm) Distance Between Mounting Hole Centers Opposite Side: 1.6" (42mm) Height from Mounting Tab Bottom to Top of Cylinder Head: 3.9" (100mm) Height from Crankcase Bottom to Top of Cylinder Head: 4.6" (116mm) Length from Backplate to Front Bearing: 3.3" (83mm) Length from Backplate to Crankshaft End: 0.63" (116mm) Width at Mounting Tabs: 2.0" (50mm) Cylinder Head Diameter: 2.2" (56mm) jxs 6/25/08 ir/jxs