02-12-2018, 12:35 AM
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CC Member
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Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
Posts: 2,797
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Not Ranked
The trouble with late model Holleys now is they all run the more efficient umbrella inlet check valve in the pump cavity, but they all don't have a pump bleed back to the bowl, typically. 013, so when the pump chamber gets hot, it dribbles out the pump nozzle, flooding the engine.
You can drill a .013 hole outside the umbrella so the pump can bleed back.
Some guys machine a groove in the bottom of the bowl near the edge of where the umbrella seats.
Early bowls with their hung inlet check ball rarely suffer from this condition.
Gary
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