Quote:
Originally Posted by FEpro
Paul,
At risk of hijacking my own thread, your sig says you're a Holley specialist.
My blueprinted 600's (now 654's) as you can see are vac sec's. They operate perfectly. I just went through them to replace diaphrams (old) and found Phil omitted the check balls. Pro or con-need them or not? What does removing them accomplish? They have always been this way so I have no baseline with them in vs. now.
Will post the block pics today. (I hope)
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FEpro,
the check ball is there to protect the diaphragm against damage from backfire through the carb. I always make sure they are in place but some guys (the ones who haven't been through Holley's classes) think it speeds up the operation of the secondaries. It really does nothing for the speed of opening but if you have a lean backfire it will keep the rubber from rupturing. The ball will not seat on the low side but it seats on the top.
Now that you know why they are used it will probably pop in the next week and blow the cover off...
Did he take out the check ball on the power valve too? It is there for the same reason.
