Posted by Bob Kerr on April 29, 2011 at 20:21:42 from (66.244.110.23):
In Reply to: Re: 20 MPG posted by Bob on April 27, 2011 at 21:41:27:
I have a 49 Chevy 3600 3/4 ton with a 216 engine and a 457:1 rear end. When I got the truck back in 1977 it had the optional 15" wheels. Almost every one of those 3/4 tons had the optional 15 wheels because tires were expensive after WW2 because the japanese trashed a lot of the rubber planations in SE asia when they retreated. I later found out in a factory parts book that 17" split rim wheels were standard but very few buyers wanted them! Took me a couple years to finally find a set as they are really scarce. I got a set off a 57 Chevy 4 wheel drive 3/4 ton. When I put those 17s on the city gas mileage acually went down a little, but on the highway it went way way up! Top speed also went up and I could acually drive it down the interstate without getting rearended. I was never able to get the mileage recorded as an oil line cracked where it passed through the water jacket and antifreeze got in the oil and ruined the rod bearings which I haven"t fixed yet(14 years ago now). 15" city mileage from what I remember wasn"t bad at about 17mpg. After that I estimate it went down to 14mpg or even less. Took more throttle to get those big wheels 750-17 tires spinning. Once they were spinning the little 216 had just enough power to keep them going and the estimated mileage went up to around 25-27. It became a totally different truck after the 17" wheels were put on. It did so well I drove that truck on long road trips! Come to think of it, with gas prices like they are I better get working on it again!
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