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07-30-2012, 12:30 PM | #1 |
Junior Member
Join Date: Jul 2002
Location: Scottsdale, AZ
Posts: 1,701
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14.5 MPG 350/700r/3.73's at 70 to 75 MPH - Should I be happy with that?
Did a 160 mi trip this weekend over a mountain pass and into Eastern Washington. AC on a little while. Do I have room for improvement or should I be happy with 14.5 MPG.
Details '71 short fleet, lowered 4/7.5. Only payload was; me, the dog, a cooler, and emergency tools. Stockish unknown miles '69 350 (.030 over) 140-150 psi compression. Rebuilt Q-jet, Edelbrock SP2P intake manifold, tall open element air cleaner. 2" Ramhorns and 2-1/2" exhaust. 15 in vacuum on stock gauge at smooth idle. Running 2200 - 2500 rpm at 75. All new ignition. Summit HEI with one lighter advance spring - 14 degrees base timing. Vacuum advance can left as delivered from Summit. Tune seems good (snappy and doesn't ping) but I feel the grunt falls off above 60-65 MPH. Swap meet 700r. Lock-up doesn't want to stay locked-up after a few miles on the highway and rarely above 60 mph. I have a new solenoid to go in but that's another story. Craigslist 3.73 posi - counted the teeth to confirm ratio. 40 series 20" tires - 29" tall. New and aligned. Didn't check air pressure. Speed GPS confirmed. 87 octane 7-11 gas. After reading some posts I'm thinking a couple more MPG could be expected. What do you think?
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"I was patina when patina wasn't cool." 1973 Cheyenne SWB Sunset Gold / Frost White / Saddle |
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