[Chrysler300] Compression Check for 413 & 383

["mplindahl" <mplindahl@xxxxxxxxxxxxx>]

Hi All,

I noticed that the 1963 Service Manual indicates compression should be 
measured with a warm engine, wide open throttle and 100 RPM.
I can assume that a normal battery will meet 100RPM?

How warm should the engine be?  Running 3-5 minutes?
Taking out spark plugs from a hot engine is not my favorite activity.
Then you need to attach the threaded hose to the cylinder. 
My hands have touched those manifolds before. Ouch!
Can I let the engine cool down somewhat, then remove the plugs?

Does not having the throttle wide open really vary the compression ?

Spec is 130-165 psi with no more than 25 psi variation between cylinders.
At what point do you start to worry about these 43 year old engines?   125 psi?  120?  115?
Also, I assume the gasoline used these days is a factor?

300ly,
Mark Lindahl
'63 300 Conv.
Barrington, IL


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