Quote:
Originally Posted by Georgboy
Delta camshafts are the guys I used for my XFI regrind, seems to be a good company.... I hope I get the 15-20 mpg increase they said they betted I would see bahahahahahah!! I would use them again. Figured you can do it on a metro, then others engines should be close to the same...
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Regrinding is a good way to reduce duration and widen the lope separation a bit.
Changes in lift don't really have a large effect on MPG unless it goes so high that it causes a temporary stall in air flow which reduces velocity.
A performance valvejob will increase signal in the intake port and increase velocity. More flow with same size port = higher velocity. That's a plus for boosting up low RPM power.