This high-quality and durable O.S. Max Cooling 18 Head is the perfect addition to your RC model vehicle. Designed for use with nitro engines, it is compatible with a range of brands including Tamyia. This cooling head is ideal for cars, trucks & motorcycles and is suitable for use with nitro & glow fuel. The 1:8 and 1:10 compatible scale makes it a versatile choice for a range of RC model vehicles. Made with precision and care, this cooling head is a great upgrade for your engine.  Also included is a CVR 18 Max engine block and rear engine cover. Great rebuildable engine. Enhance your RC vehicle's performance and take it to the next level with the O.S. Max Cooling Head 18 and  CVR 18 Max engine block .