Volvo Penta AQ 171 B230 4 Cylinder Engine DOHC Wet Exhaust Manifold 855434. In excellent condition with no cracks. Only fits DOHC with oval ports. Obsolete and very hard to find. Get it while it lasts. One port has some corrosion from a bad head. It was installed on a new cylinder head and sealed up fine with a composite gasket and ran for a few years until the timing belt broken. Weld it up or use it as is.