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g mcmaine · 01-02-2014, 08:08 PM

Just wondering what highway mileage you guys with stock LS swaps were getting.Thinking of putting a 5.3/4l60e into my 3.54 geared '67 c20 if mileage increase would be around 18 highway or better.Currently have 327/TH400 and trying to decide if a 700r4 behind my 327 or go to modern LS setup.Currently have a 2002 Silverado with 4.3,gets 20MPG in highway.If I can get close to that mileage, I would rather drive my '67.
Thanks,Gerald.

01-02-2014, 08:08 PM	#1
g mcmaine TRKFRMR1 Join Date: Oct 2002 Location: WACO,KY Posts: 37	Mpg Just wondering what highway mileage you guys with stock LS swaps were getting.Thinking of putting a 5.3/4l60e into my 3.54 geared '67 c20 if mileage increase would be around 18 highway or better.Currently have 327/TH400 and trying to decide if a 700r4 behind my 327 or go to modern LS setup.Currently have a 2002 Silverado with 4.3,gets 20MPG in highway.If I can get close to that mileage, I would rather drive my '67. Thanks,Gerald.



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