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no big deal

June 8 2008 at 12:47 PM		bill  (Login billinstuart)


Response to They can be tuned, within limits
A vacuum secondary carb is designed to only open the secondaries as needed for proper air flow. Opening them too soon or too wide will reduce performance by allowing the airflow through the venturis to drop below the desired limits.

If the motor seems lazy all of a sudden, look at ignition/timing first. As Tom said, a 327 is gonna have a hard time opening the secondaries except a full throttle and high rpms. BTW, opening the secondaries on my 450 cfm Holleys on 302 Fords only picks up 200-300 rpms.

 
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