Currently I am in the process of rebuilding my 85 Chevrolet truck from
top to bottom. I am seeking advice on my choice of engine and
transmission combo. It currently is all original with a 305 and TH350.
When completed I will be driving it around a 100 miles a day, and I
want an overdrive for better gas mileage. On the weekends I go to the
lake and have a boat that weighs about 2500 lbs. What is the best
combo? Can I get 20+ mpg and still pull my boat around locally?
I would try the 305 with 700r4 and 3.42 rear axle ratio with highway tread
tires. This is a pickup, isn't it (1/2 ton)? Do some research and find a cam
with a good power range fitting for your driving plans based on tire size &
final drive ratio. Make sure your carb is right. If needed rebuild it and
pull the plugs covering the adjustments. Or use a older model quad. If you
really serious about mileage, get and old model 2 barrel carb & re-jet it.
This may take some trial and error, you want them small but not too small.
Just needs to a be set right and have a light foot. It will be hard to get
much over 20mpg but 20-22mpg would be my guess.
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