Many of the early 70 General Motors cars helped meet the new emission
standards by not allowing vacuum advance in the first 2 gears (3 speed
standard).
They has a solenoid in the vacuum line that only opened when you shifted into
3 rd gear. Also on the 6 cyl. that I was familiar with they had changed the
timing from 8 before to 2 degrees.
Well, a piece of rubber hose to by pass the solenoid and a change of the
timing back to the old setting and the 'in town" mileage went from 10 mpg to
16.
I could never figure out the science behind that technical madness. How
could there be less pollution if someone was using 50% more gas;-) Thankfully
they have overcome the problems. We now have pretty darn good gas mileage
and create very little pollution.
mark
**************It's only a deal if it's where you want to go. Find your travel
deal here.
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