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It was too long ago for me to recall mpg #'s back then I was not into keeping track. Depending on what you use the truck for Frank swapping an 8 for a 6 would be a waste of time. Its not like you will make it up commuting with it? around town an 8cyl gets almost identical and in some cases better stats than a 6 cyl.
If I had a 283 in a truck and wanter better fe I would #1 make sure I was running a quadrajet carb due to the small front bores or B. I would replace a 4 bbl with a 2 Holley makes a nice 500 cfm 2bbl that works nice on a small v8
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2012 Chevrolet Traverse *active*
2002 Oldsmobile Alero GLS *active*
2002 S10 2wd p/u 139,000mi. *active*
1975 Corvette Stingray *active*
1994 Camaro Z28 Convertible 149k *Sold 2013*
1998 Blazer ZR2 189k *Sold 2012*
1995 Tahoe LT 250k *Sold 2011*
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