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Re: 85 GMC with a 427 Help by Scott
Post New Message I have an 83' GMC Bluebird with a 427. I replaced the 366 original motor. Mine is a 5 speed and I only top out at 53MPH without over-revving the engine. A lot has to do with the rear end gear. Mine is 6.-something. Find out if the owner had it replaced by a 4.11. That gets you about 70 MPH. I used to run the 366 at about 70 until I blew the piston right out of the side of the motor. My bus is full sized and gets 9-10 MPG with the current setup.
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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