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Yes. DOHC. It looks like the gears are shrunk on with a key so only whole teeth adjustment would be possible. Vacuum is already quite low. It appears to run about 5-7 inches at idle and drops away toward 0 with any throttle. Unless I was "T"ed into a restricted port that is also connected to a steady vacuum consumer. I am actually more interested in lowering the rpm of the torque peak. Possibly by increasing the length of the tuned intake runner. But even this would tend to take the mixture off of the stock map so I think any real economy gains from engine changes would require an after market fuel computer with wide band mixture logging in lieu of a dyno with a probe. They are available from Bazzaz and I will probably get one eventually if nothing more than to play with some light throttle, lean burn settings.
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