Settle something for me...390 vs 400.

[rusty ol ranger]

My 3.0 is fine. Old but fine. EGR and EVAP gone. Converter doesn't convert any longer. Have to use a 160 thermostat to keep the computer from going into closed loop, runs open loop full time. Bottle under the hood full of E85, feeding through a vacuum hose straight into the intake manifold. I use a C clamp to pinch the hose to control the amount going in. No muffler, two pipes poking out in front of the left rear tire. Big Huge stainless steel mesh cone filter, with two scoops on the hood directly above it. JET tuning chip on the computer. Got 245/60 TA Radials on the back. Spin them all the time inadvertently. I think the E85, in addition to what the computer feeds it from the tank in full time open loop, does the trick.

I bet my 2.9 would still run it down

 

[racsan]

Never drove a 390, drove a 360 once, 76 F150 4x4, C6,3.73’s, leaned out for mpg’s. wasnt impressed. We had a 77 F250 with a 400 though, C6, 4.10’s, full time 4wd. The previous farm truck was a 74 2wd F250. 300,np435, 3.73 The 77/400 was awesome, liked its fuel for sure but would pull anything, quite the snowplowing beast too. Sure couldn’t afford to drive it everyday, especially now with $4/gas. I checked it once- got 9mpg. Never had the chance to drive a 460.