My Duster with 3.91s runs about 3500-3600 rpm at 68-70 mph. Usually I will run around 3300-3400 rpm on the highway, but sometimes you need to run a little quicker to keep up. Eventually a 4 speed will be going in. Tires are 255/60/15s. Motor is a warmed over stock compression 318 (with XE268 cam) with 45K since the last rebuild. Doesn’t use a drop of 15w40 Delo oil between changes. The engine buzzing doesn’t bother my ears, but with regular oil changes (every 1500 miles), am I flirting with danger at the revs mentioned? I don’t think so, but just wanted to hear some opinions!
2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.
Searching for new A or B Body Project!
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