Mercruiser 5.7LX backfire through carb.

[Bondo]

Well....discard this thread. Compression check showed 30 psi in #2 cylinder. At least it's something definite to start with, anyone have any ideas where to start. I'm thinking valve cover and take a look at springs, rocker arms, pushrods....maybe roll it around a bit see if cam lobe is toast.

Ayuh,..... Inject air into the cylinder with the compression tester tail, hold the motor from turnin' at Tdc, 'n Listen,....

You'll hear the air comin' out the carb, or the exhaust, or the oil fill,....