'Course its gonna hold steady. A compression gauge has a one-way valve on it. Once the compression enters the gauge it's kept from exiting (basically a Schrader valve in there). The gauge hold till the cows come home, but the cylinder's a different monster. Do a leak-down. Anything more than a few % warm will be a good indicator of where that oil's going.
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Jeff Chambers
1990 Mustang GT 10.032 Seconds / 137.5 MPH
14-time Street Warrior World Record Setter
CRT Performance
2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH
2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2
"There's nothing boring about a small block automatic shifting gears at 9400 rpm!"
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