Editing Determining top dead center (section)
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==Getting started== Attach the degree wheel or refer to '''[[How To Make A Timing Tape]]''' or buy a timing tape that matches the diameter of the damper. Also buy or make a piston stop tool. Using a tool that has a hole drilled through the center of the probe will allow pressure or vacuum to escape through the hole from the piston moving up and down in the bore with the rocker arms disabled (valves on their seats). This makes turning the engine over w/the piston stop installed easier. You'll need access to the harmonic damper outer ring. If necessary, remove the fan, belts, shroud and water pump pulley. You may have to remove the water pump to gain full access to the damper ring and do the measuring needed for this operation. If this is necessary (removing the water pump), this would be a good time to replace the pump if there is any question as to its condition. Pumps and gaskets are not that pricey. Whether or not you replace it, remove the pump and check for impeller slip on the pump driveshaft by holding the impeller securely with one hand and the drive hub of the pump with the other hand and twist in opposite directions. If there is any movement, replace the water pump before it fails completely. Even if the pump is good, you may want to replace it with a high-flow unit. FlowKooler, Stewart and Edelbrock are names that come to mind, there may be others who produce a quality high-flow pump. A good high-flow pump is nearly MANDATORY on a 400 SBC or any other engine which uses siamesed cylinders. ===Water pump suppliers=== *[http://www.flowkooler.com/ FlowKooler] *[http://www.stewartcomponents.com/ Stewart Components] *[http://www.edelbrock.com/automotive_new/mc/water_pumps/water_pumps_main.shtml Edelbrock]
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