Might I suggest looking at your dizzy first? by the sounds of it your going to need more initial advance probably around 15 degrees. Do a search on dissy setup or Steve might put up a link. [ I did see your running manifold vacuum]


• what power valve? As Charlie said. I usually set it up looking at cruise vacuum as Im not sure why its suggested by Holley to set it up based on idle when it nothing to do with that circuit. Roughly I find it one higher than the half method. I think you might be right with the 6.5 [standard]
• what jets and metering blocks? Jets. you should be close at 65 ish, but you'll have to play. metering blocks you wont touch.
• squirter size?  again play, with a manual car and if its heavy ..mmm?
secondary spring. I know my auto liked a heavy spring [brown]
Pump cam . try a green one  ; )

Good luck and have fun.




"Came too close to dying to stop living now!"

A rule of thumb for the power valve is to use one that is half of your idle vacuum.  That will not necessarily be ideal but it should work well.

The rest is not really something that can be recommended.  You just have to figure it out for yourself.  It will be best to start with the base calibration of the carb, that is however Holley would have provided it, and tune from there.  As with any kind of tuning, change only one thing at a time and take notes as you go along.


Lawrenceville, GA

Hey guys I am trying to set up a rebuilt holley 600 cfm with vac secondaries. Having some troubles. I havnt messed with holleys before but i want to get this one dials nicely. I have a 292 bored .060 with the isky e303 4444 cam. headers with glasspacks and 4 speed amnual trans. Vacuum is pretty low at idle with the cam. also have john mummert aluminum intake, My question is about car set up.
• what power valve?
• what jets and metering blocks?
• squirter size?

Anything else I need to know. I am trying to run manifold vacuum too.