Check to see if the cylinder head gasket is blown, or if a reed valve is stuck open. This has happened to me a few times over the years. Would just run and run, but not build pressure.
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71' GTO -original 400/4-speed/3.23 posi
13.95 @ 102.1 on street tires @ 4055lbs.
‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears.
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