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Re: 305 v8 or 250 I6 for better mpg
For normal driving with a near-stock engine setup that is LOW MPG no matter which engine is in there. That particular 600 CFM carb may be an issue, especially if takeoffs are racy and if one has an unsteady foot at highway speeds. To answer your question, experience here has been that a smaller cu. in. small block will yield as good or better MPG than a 250 I6. If you want some performance ability but mainly are interested in better MPG, my suggestion would be the small block with HEI (including correct wires/plugs) and a good 2 barrel carb. Have not used one, but have been told that the Holley Economaster/mizer is good. Hope this is helpful.
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67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison
Moved but still in the family
70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350
Recently sent to new homes
72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp
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