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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
23,867 Posts
I believe that should be OK as the service manual procedure wants the throttle wide open for a compression test.
The procedure also states that the spark plugs should all be removed and the engine warm. I don't know how important that is if you are only looking for a fairly even balance of compression between all 8 cylinders.

See post #10 in the following link:
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