| Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | I use Tony's method, then slightly advance it 'til it just starts to ping under load, then retard slightly. At higher altitudes(5,000' plus here) one can advance and lean out slightly over sea level settings. Lower octane fuel works fine here.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
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