Thread: 2x4s vacum or mechanical secondaries?
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Old 06-08-2002, 01:55 PM
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So why would you want to wonder when and if the secondaries are going to open? It takes a lot to draw open Both of the 600 cfm's.. Got an hydraulic cam FE?.. Forget it by the time they start opening you are out of revs and you may never get them open all the way.. If you want to try and use the secondary respring kit and go with the lightest springs and work your way back.. The bog desciribed in the previous post is just further evidence of 1200 cfm being too much carb. Do you think it bogged at the mid point of the secondaries opening? no.. The beginning.

Holley does a wonderful 450 cfm as well as 550 cfm mechanical secondary carbs that with practice open when you tell them to.. I can get 18 mpg or 10 mpg depending how I choose to use what I have.. and I have never had a bog..
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