1966 GMC 305 V6 Service

[Rufton]

Originally Posted by TommyDuncan

thanks for the reply. What rear end gears are you running?

A friend of mine had one of these and swears he got 7mpg no matter what. He also said it was geared to low for much hwy use. After looking at their low rpm torque curve I wonder if it is necessary to gear them that low?
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Pre 2012:
305E loves 70+ mph cruise
3.07 dana 44
P235/75R 15 28.9"
Stromberg WW 280 CFM 2bbl
Main jets 0.055", 0.054"
Poor compression
high oil consumption
2" single exhaust pipe
quiet muffler
mix 8-9 mpg
70mph hwy 9-10mpg

2012 changes:
Main jets 0.050", .050"
70mph hwy 11-12 mpg


2013 changes:
Main jets 0.050", .050"
305E rebuilt
Good compression
Low oil consumption
mpg to be determined