650 speed demon help

Old 04-19-2009, 08:25 PM
  #1  
purplemonte
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Default 650 speed demon help

Have a 355 chevy with a edelbrock performer package in it and vortec heads. I put on a 650 speed demon and the car has a bog when you hit the throttle for a second or 2 before it takes off. It is a vacume secondary carb should i go with a stiffer spring to slow down the secondaries.
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Old 04-20-2009, 01:41 PM
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oldandtired
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Default

Several possibilties:
Weak secondary spring
Timing
Acc pump linkage out of adjustment
Bad check (the diaphragm thingy) for the main acc pump.

Good luck!!
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Old 04-20-2009, 07:48 PM
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Jordan1984
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I had the same problem with my 650 holley carburetor, it was a matter of getting the jets right and the cam pump on the side of the carburetor adjusted right. Finally after many tries I finally got it right.
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Old 04-20-2009, 07:55 PM
  #4  
dparker
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Default Re: 650 speed demon help

Originally Posted by purplemonte
Have a 355 chevy with a edelbrock performer package in it and vortec heads. I put on a 650 speed demon and the car has a bog when you hit the throttle for a second or 2 before it takes off. It is a vacume secondary carb should i go with a stiffer spring to slow down the secondaries.
Nope. Secondaries aren't even opening yet, when your first hitting the throttle. Try a bigger squirter and check for any vacuum leaks.
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Old 04-21-2009, 06:36 AM
  #5  
kbartley
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Default 650 demon help

I agree w/ dparker. Sounds like a similar situation we were having w/ the monte that I was telling you about. Except the factory distributor was the problem so he bought a new HEI dist. hooked up the vacuum advance and that cured it. Since he drives it everyday this was a good choice for his pocketbook. Kris
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Old 04-30-2009, 06:04 AM
  #6  
kbartley
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Default 650 demon help

Did you get youre carb straight??? Kris
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Old 05-22-2009, 04:40 AM
  #7  
kbartley
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Default 650 demon help

I guess he fixed it.

Kris
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