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Re: gas leak?
If the damper has in fact shifted, replace it!! That outer steel ring can do alot of damage should it exit the hub at 5 grand, been there!! Also, I was a Chevy mechanic for 33 years and I know for a fact the vac advance supply is from below the throttle plates not above. It needs manifold vac NOT ported vacuum. Find a port on the carb where full manifold vac is available at idle. Leave vac line off when you time it then reconnect line when timing is set correctly. My 84 gets 17 MPG with a Q-jet on a 350 if I'm real soft on the throttle. jim
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1984 K20 350M engine with 465,000 miles. Well, it's finally done!! Almost 2 years of work, but it was really worth the effort. Little stuff left to do is mount winch, wet sand & buff out and build belly pan\running boards. Body work takes lots and LOTS of beer!!!! God, Guts and Guns made America and God, Guts and Guns will preserve it! The worst thing you could do is get into my sights, but that don't matter, you'll never know it, cause you'll never hear the shot  Jim or Paladin whichever you choose.
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