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06-24-2005 09:45 AM #1
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- Jun 2005
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- East Hartford
- Car Year, Make, Model: 1989,Pontiac,Firebird
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Swap 2.8 V6 TPI to 5.0 305 V8 Carb
I purchased a Firebird/Trans-Am that had this swap done to it. The Speedometer reads fine for the first 40mph, but after that it instantly tops out.
Would this be a cable issue?
Need to recalibrate the speedometer?
Swap out the speedometer for one from a V8?“Luck favors the prepared mind." - Louis Pasteur
"Failure’s a learning experience, and the guy who’s never failed has never done anything"- Wilson Greatbatch
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06-25-2005 06:06 AM #2
CHR Member
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- Eston
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- 2,270
If its not an electronic speedo, the head (dash unit) is shot. Go to the boneyard and get another one.
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06-25-2005 07:32 AM #3
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- Jun 2005
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- East Hartford
- Car Year, Make, Model: 1989,Pontiac,Firebird
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Does it matter if the new speedo is from a V6 or V8 dash?“Luck favors the prepared mind." - Louis Pasteur
"Failure’s a learning experience, and the guy who’s never failed has never done anything"- Wilson Greatbatch
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Welcome to CHR. I think that you need to hook up your vacuum advance. At part throttle when cruising you have less air and fuel in each cylinder, and the air-fuel mixture is not as densely packed...
MSD 8360 distributor vacuum advance