The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - What could i possibly get for MPG with these two setups?

rich weyand · 04-06-2015, 02:07 AM

Those are kind of weird setups. I think the bbc would tolerate the 3.73 better than either of the sbcs, but with 33" tires, I would definitely go 4.11 on any of them.

TBI will give you better mileage than the carb setup DustyNova is talking about. I dunno. I think with the sbcs you would probably get 14-18 because of the overdrive and the TBI.

Put a carb 350 on there without overdrive and you are looking at 10-12. That number I know for sure!

04-06-2015, 02:07 AM	#4
rich weyand Registered User Join Date: Apr 2014 Location: Bloomington Indiana Posts: 1,041	Re: What could i possibly get for MPG with these two setups? Those are kind of weird setups. I think the bbc would tolerate the 3.73 better than either of the sbcs, but with 33" tires, I would definitely go 4.11 on any of them. TBI will give you better mileage than the carb setup DustyNova is talking about. I dunno. I think with the sbcs you would probably get 14-18 because of the overdrive and the TBI. Put a carb 350 on there without overdrive and you are looking at 10-12. That number I know for sure! __________________ Rich Weyand 1978 K10 RCSB DD.