tell me about inline six/I have some question

[shifty]

I had 15" wheels with standard sized tires for those wheels. I upgraded to HEI, but put open headers on at the same time and still saw an increase of 1mpg roughly. Highway driving with the 3spd killed me because at 65mph I was running too many RPM's to be very efficient. 8mpg was max I would get. I have no idea about city driving. Not very feasible to do much stop and go with 3-on-tree, no power steering and in heavy traffic.

[TP from Cntl PA]

I have a 250/4spd in a '72 K-20 with a stake body(Weighs more than a stock box).

I posted over on the inline board about being impressed with the mpg of it. This same engine was in our '69 C-10 Farm truck. The guy who owned that truck before us road the wheels nearly off of it since buying it new. All it ever had done to it was a valve cover gasket, and we did have to pull the pan after the threaded plug inside the pan broke its spot welds and turned, so we couldn't get the oil plug tight. We took the pan off and welded the insert and re-installed it with a new gasket. We tore that old truck apart, and I took the engine, painted it, and dropped it in my K replacing the 454. I added a Clifford 4 brl water heated intake, Clifford truck headers, Edelbrock 1404 500 CFM carb, made a air box to use the air cleaner off a V-8 which moved it over top the valve cover. Nothing but pipe and a glass pack for exhaust which dumps infront of the rear wheel on the drivers side.

Anyhow, after some initial troubles getting it tuned, the guys over at inliners.org helped me out and I was able to get her running right. We've been driving it alot and its probably the best truck we have mpg wise other than the one with the Cummins. I don't know what gears are in this truck, but she runs pretty good down the interstate, but still is low enough I don't have to drop down to 3rd very often on hills. I can't say what I am getting with the 6, but I was getting 10 with the 454, and its WAY better than that judging by some of the places I went, remembering how before with the 454 it took a 1/4 of a tank, now the gage barely moves. Since I am not the only one running it daily, its hard to check fuel mileage which is why I haven't yet.

I am going to eventually swap this engine out for another Inliner I am going to build up. But I may run this one until it gives up, but going by our past experiences that may be a LONG time.