Hello

I have a later 70's 350 SB with a 600 CFM Holly (Vacume 2nds) with a H.E.I ignition.

Symptoms :
- Engine starts fine, idles lovely, drives lovely as long as you do not expect much power from her..

When you are driving, if you put your foot down to the floor the motor does not bog down, it just starts to give missing like symptoms and gradularly gets up to speed but definately not full power.

What I have tried so far..
  1. Replaced Plugs
  2. Replaced HT Leads
  3. Replaced Coil, Cap, Rotor
  4. Rebuilt Carberator
  5. Bypass the secondarys with a screw (noughty I know)

All cylanders were around 140-145psi for the compression test. The #2 cylander was at 120psi though, I have not factored this into the issue.

Another thing to note is the plugs fowl up something cronic.

Now I have taken the vacume hose off the vacume advance for the dizzy and sucked on it.. the mechanisum moves..

I am really stumped.. So in a nutshell, if you load the engine up with your foot planted, it does not want to perform. I have set float bowl levels correctly for both chambers also, this really has me stumped hehe

Cheers in advance for any ideas

Leyton