Tech / General EngineIs your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
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if everything was the same (in theory), would gas milage decrease?
All else being equal, it shouldn't be much different. The 5.0 TPI and 5.7 TPI ratings were basically the same, I think the 5.7 was like 1mpg lower city and hywy, 383 wouldn't be much different than the 5.7
Mine improved from 18 mpg with the 305 to 24 mph with a 406. Check you PM's for more data.
__________________ HERS
90 IROC-Z 350 TPI--Summer 00 Bravada--Winter
HIS
86 TRANS AM 406 TPI--Summer 05 Rainier--Winter
85 Impala--Work car
BIG TOY--68 Triumph Bonneville
little toy--72 Honda Mini Trail 50
You may see an increase if the engine's output is increased in the area that you spend most of your rpm's. However a 350 tpi should have more than enough tq to get the car moving well at low rpms.
