08-15-2009, 02:21 PM
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CC Member
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Join Date: Apr 2007
Cobra Make, Engine: # 757 ERA 427 SC , 482 Al. big block
Posts: 897
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Not Ranked
Argess ... on my idle , I also went to the strongest springs on my mechanical advance so it wouldn`t come in too quickly ... but be all in by 2500 to 2700 rpm . Interesting what you said about 38 degrees giving you the best idle as my engine builder just dynoed a 482 with tunnel port heads and had the distributor locked at 37 degrees . He made over 700 hp and said he had a smooth idle at 700 rpm .... which surprised him .
One other point , I`ve been told that a smaller spark plug gap ( .035 to .038 " ) will give a smoother idle than a large gap .
You mentioned engine rpm dropping under hard braking ... you might try running a rubber line from the front vent to the rear vent of the carb(s) , but drill about 6 to 8 holes in the top of the line at the high point .
Have fun .
Bob
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