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Old 01-18-2022, 07:49 PM   #6
Tom
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Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,687
Re: What makes a engine efficient???

Unless you are racing around, you aren't using all the power the engine makes. So first possibility:
The 350 easily makes enough power at part throttle just like the 383 did, except its moving 33 cubes less air to make that power. That makes sense for the city mileage, but not the freeway staying the same.
Second possibility and more likely: carb tuning.
Third possibility: that LSA. It sounds like your 383 had a stock LT cam in it, and the LSA is wide. The more narrow LSA of the aftermarket cam might make it work better in the rpm range your running around town.
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