Abstract: A filter head for spin-off filters comprises an extruded body having a first longitudinal bore and a second longitudinal bore separated from each other, and an elongated, laterally expanded flat exterior surface. Fluid passageways are bored through the flat surface to intersect with the longitudinal throughbores so that separated inlets and outlets in the spin-off filter can be fluidly connected with the longitudinal bores. Preferably, the extruded body also includes a mounting flange offset from the flat longitudinal surface so that the filter head can be mounted to a surface which does not interfere with the installation or removal of the filter. The elongated extruded body is cut to any desired length required for mounting one or more filters of various sizes against the longitudinal flat surface.

Abstract: An improved degree wheel device includes a degree wheel which is adjustably rotatable relative to the crankshaft on which it is carried. The wheel can be easily adjusted so that a zero degree reading corresponds to top dead center of piston travel. Much of the calculation necessary to determine cam phasing, cam lobe centerline, valve overlap, and the like is thereby eliminated. The degree wheel preferably includes counterclockwise 0.degree. to 360.degree. indicia for a direct and calculation-free determination of the duration of tappet lift.