It also depends on where the vacuum line is hooked. Some are hooked directly to intake manifold, most are above the throttle shaft. The larger IH v8 gasoline engines hooked into intake manifold. You had to unhook them to time the engine with a light. With it unhooked and timed correctly the engine would labor, then you hooked it back up and it ran free. I remember a service station in town timed one with it hooked and that made timing about 14 degrees late. Was an easy fix to get the power back up for that customer . Other engines hooked that way also but this one always stuck in my mind.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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