Re: Holley secondary 'check ball'?
I have always removed the secondary diaphram ball, allows faster opening of secondaries, but its real purpose is an anti backfire valve to protect the diaphram from sudden pressure changes.
Another ball is under the accel pump, check valve and another ball under the squirter, check valve.
Another trick for faster sec opening is removing the lead at the end of the tube on pass side of body midway up pointing the rear and drill the hole to the venturi to 0.083" to allow more signal for the diaphram for secondary opening and plug it with a 10-32 setscrew and Loctite.
I type too slow.
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