Jim,
12-14 base timing is ok , esp if it starts good. I like to see 34-36 timing mech+ base at WOT. On the highway rpm timing should be 40-45 or maybe even higher.
My engine on the highway vacuum runs at 10-12 on flat ground and around 5 inches on slight grades.
You have less motor,so it has to work harder , thus less vacuum.
More people need to hook up vacuum gauges.
Now, what carb are you running? If a Holley, get a power valve that opens around 3-4" vac and you will get much better economy.
Last edited by tlowe #1716; 06/24/10 10:03 AM.
