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Old 06-08-2010, 01:44 PM
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holley vacuum port for distributor

I have a new 600 cfm Holley on my corvette small block engine from 1968 in my bizzarrini strada
on the holley are different vacuum ports
what is the best port to get a proper vacuum advance?
is there a difference between the ports?
thanks janpiet groningen holland

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Old 06-08-2010, 03:33 PM
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Set the base timing to 12 degrees before top dead center with vac advance disconnected and plugged. Lock the distributor, reconnect vac advance to a manifold port or one that pulls vacuum full time even at idle. Reconnect vac advance, the timing should be around 20 - 24 degrees before top dead center. Test drive. If ping is heard, back the timing down 2 degrees at a time until pinging stops. After setting the timing you`ll likely have to readjust the idle.
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Old 06-09-2010, 03:28 PM
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holley vacuum port for distributor 32 advance with full vacuum

holley vacuum port for distributor
thanks double vision I have now with full vacuum and about 800 rpm a advance timing from 32 degree
to much?
janpiet
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Old 06-09-2010, 04:10 PM
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You mean 32 degrees at idle? if so that`s way too much. At idle it should be 20 to 24 degrees with vacuum advance. 12 degrees at idle with vac advance disconnected. Full advance should be around 36 degrees at 3000 RPM and over.
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Old 06-09-2010, 09:20 PM
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Janpiet...just to clarify, did you hook up the vacuum to one of the Holley vac. ports or to a full time port on the intake manifold?? like at the base plate of the carb??
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Old 06-13-2010, 01:48 PM
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holley vacuum port for distributor

DoubleVision and 327NUT thanks for input

I have connected the vacuum for the distributer at the base plate of the carb.
timing set on about 10 degr without vac and that give with connected vacuum about 25-28 degr on my stroboscope
car runs good but not perfect.
no pinging.
a little unrest/vibration/shaking by 800 rpm
dwell 30-32
its a new holley carb and set the idle mixture screw/needle about 1,5-2 turn free.
the switch between idle and more rpm gives a little hesitation.

suggestions?

greetings janpiet
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