Quote:
Originally Posted by chevy_mike
The HEI without a vacuum advance could be a later model version that was computer controlled timing. My '92 Camaro had one. Most aftermarket or earlier GM ones had the vacuum advance.
Your mileage should go up with the vacuum advance, assuming you get everything set correctly.
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Hmmm, computer controlled timing? Sounds like something to look into. What what performance like on that? Did it have mechanical or purely electronic?