If you work the truck and use a vented oil-filler cap, bear in mind that at 0 vacuum there will be fumes coming out of the filler cap. On my truck I can smell it and that reminds me to ease up a bit and hold about 2" vacuum. That eliminates the problem and probably forestalls others arising from running WOT for extended time. Sometimes I drop a gear netting about +400RPM and a bit better vacuum; maybe even better fuel consumption.


1951 3800 1-ton
"Earning its keep from the get-go"
In the DITY Gallery
1962 261 (w/cam, Fenton headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.