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Re: better MPG?
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Posted by the tractor vet on July 22, 2006 at 12:06:00 from (66.202.111.157):
In Reply to: better MPG? posted by Tim Shultz on July 21, 2006 at 19:03:47:
Well first off what engine we talken about ??/ Back when they were new the 360 needed a tanker behind it . We did have good luck with building 390's and getting up to 15-18 mpg . What we did way back was to build a 390 with 9-9.5 to 1 comp. ratio useing the cam that was stock for a GT 390 dual exhaust with 2 1/2 inch pipes a 4 bbl. carb on a low rise manifold Carb CFM was kept at no more then 735cfm with some playen with jetting and power valve . The power and mileage was excelent . We did not use headers just dual exhaust . Now we could run reg. gas by keeping total advance timming down to 34-36 degrees at 2000Rpm. But one has to keep in mind that reg gas back in the mid 70's was still 93-95 octain . I built one for a buddy of mine for his 75 Ford F250 4X4 with a 4 speed and 4.10 gears that realy had tomuch power as we had some drive line problems like the short shaft between the transmission and transfer case plus u/joints . now that one did well on fuel milage as it was always up above the 17 MPG.
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