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Kirkham Motorsports

 
 
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Old 05-12-2003, 06:48 PM
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Join Date: Jun 2001
Location: Washington DC Metro (Virginia), VA
Cobra Make, Engine: Classic Roadsters, Tweaked 351W, T-5Z, CRII Tech Support Team.
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Default Demon Carbs
Just about everything I read in the rags extol the virtues of Demon over Holley.

Holley 4778 700DP on 351W was driving me nuts getting it to stay idling correctly, and trying to dial out flat spot on acceleration from cruise.

Just bolted on Speed Demon 650 DP. Initial impression, it didn't even sound like the same motor. Sounds much smoother and healthier with rock steady idle. Pulls nearly 17" vacuum at idle with Comp 224/224 .533/.533 hydraulic roller, where the Holley could only pull 15". Throttle response is much crisper, and no flat spot anywhere. I'm impressed. Now for the dyno.
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