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Old 03-23-2007, 01:14 PM
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Compression stroke vs. Exhaust stroke

i have my 351 #1 piston at TDC. the dots on my timing chain are at 6 and 12.

what is the difference between compression stroker vs. exhaust stroke? both valve appear to be closed...

im trying to figure out how to put in a distributor? will it be "180 out" whatever that means...???

Id appreciate any help

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Old 03-23-2007, 01:27 PM
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Compression stroke happens after the intake valve closes. Exhaust stroke happens with the exhaust valve open. Just think about how an engine works and watch both the valves and the piston.
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Old 03-23-2007, 01:34 PM
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Compression stroke

If both valves are closed you are on the compression stroke. When the opposite cylinder in the firing order has both rocker arms rocking your target cylinder is on compression and both valves shut. Ignition occurs during the compression stroke so if you align the distributor to that cylinder you will have the timing close to correct.
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Old 03-23-2007, 01:43 PM
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thanks so much
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