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Re: 85 GMC with a 427 Help by Phil Feinstein
Post New Message With a 427, you're probably looking at the Turbo 400 or some varient of Powerglide (727, etc.). You can figure this out by looking at the metal tag attached to the pan or tailhousing on the trans.

Gas mileage depends on load, tune, speed and how heavy your foot is. If you carry light to moderate loads, keep the motor tuned and keep your foot off the pedal as much as possible, the best you will see is about 10 to 12 MPG. Keep in mind that you are looking at a big-block V8 and that it will use gas respectively. If you luck out and it has a TBI fuel system, you may see 10-12 MPG regularly. A carb makes that number harder to come by.

Hope that helps!
All Messages in ThreadAuthorDate
Post New Message85 GMC with a 427 Help Jimmy 9-1-05  
  Reply to MessageRe: 85 GMC with a 427 Help Phil Feinstein 9-7-05  
  Reply to MessageRe: 85 GMC with a 427 Help jimmy 9-7-05  
  Reply to MessageRe: 85 GMC with a 427 Help Phil Feinstein 9-6-05  
  Reply to MessageRe: 85 GMC with a 427 Help Jimmy 9-2-05  
  Reply to MessageRe: 85 GMC with a 427 Help Phil Feinstein 9-2-05  
  Reply to MessageRe: 85 GMC with a 427 Help Phil Feinstein 9-8-05  
  Reply to MessageRe: 85 GMC with a 427 Help Phil Feinstein 9-8-05  
  Reply to MessageRe: 85 GMC with a 427 Help Rick Wells 10-14-05  
  Reply to MessageRe: 85 GMC with a 427 Help Jimmy 9-29-05  
  Reply to MessageRe: 85 GMC with a 427 Help Scott 9-27-05  
  Reply to MessageRe: 85 GMC with a 427 Help ron 9-13-05  
  Reply to MessageRe: 85 GMC with a 427 Help Rickster 11-25-05  
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