If the cams are right...check the valve clearances...if they are too tight and holding the valves open it will push air back out the intake. If the valves have the right clearances then it might be time for a valve job as air is leaking back past the intake valves.
If everything is correct and it still happens and you have a race cam installed....well sometimes they have so much valve timing overlap they will spit back out of the carb when you roll them over.
If it's really pushing out the carb with some power instead of just spitting some...then it's probably the cam timing or valves way too tight....or even a bent valve if it's just one side. If both sides are doing it almost exactly the same...that points to a timing problem or radical camshaft...cause it's unlikey both valves are equally bad, or mis-adjusted.
That symptom is usually one of my most dreaded things to see after assembling and engine.
JohnnyB
If everything is correct and it still happens and you have a race cam installed....well sometimes they have so much valve timing overlap they will spit back out of the carb when you roll them over.
If it's really pushing out the carb with some power instead of just spitting some...then it's probably the cam timing or valves way too tight....or even a bent valve if it's just one side. If both sides are doing it almost exactly the same...that points to a timing problem or radical camshaft...cause it's unlikey both valves are equally bad, or mis-adjusted.
That symptom is usually one of my most dreaded things to see after assembling and engine.
JohnnyB