Quote:
Originally Posted by RCM
Great info here. Helpfull to me.
My 223 six has a Holley 1904, without a scv
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Some LoadO carbs use a distributor check ball to blend the differential vacuum between the upper and lower distributor vacuum ports. They do not have a SCV.
You still have one port at the top and another down at the throttle plate which has the distributor check ball in between them which goes up and down to help regulate the vacuum advance.
The distributor check ball performs pretty much the same function as the SPV. It blends the venturi vacuum and the throttle plate vacuum to regulate the dizzy advance.
At least that is how it is supposed to work. Sometimes sticky balls can be a problem. (apologies to Andrew Dice Clay if I stole one of his lines from when he was Ford Fairlane.)