Quote:
Originally Posted by scicala
The outer diaphragm which is connected to manifold vacuum is only for the momentary retarding of the spark on acceleration.
Sal
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And de-acceleration.
The trouble here is that everyone has different ideas and theories of how the system is supposed to work.You ask questions to try and diagnose and there is no answer.
The system works on a modified (continually) manifold vacuum signal The 1956 DUAL DIAPHRAM was HOLLEY's last attempt to correct problems. DUAL ADVANCE was introduced the following model year.
Sounds like the OP found the problem in the accel linkage.
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My 57 A/T Only Has Two Speeds"
I had the same problem with a Powerglide ... no matter how hard I tried, I could NOT get that thing to shift into 3rd.
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