Built Sbc Vs Nearly Stock Bbc

“Given that both engines have about 400 HP. Which engine would have lessor fuel consumption in the same vehicle.”

The one with the greatest volumetric efficiency at 400hp..
That being said it will likely be the one that makes the power at lower RPM.
 
“Given that both engines have about 400 HP. Which engine would have lessor fuel consumption in the same vehicle.”

The one with the greatest volumetric efficiency at 400hp..
That being said it will likely be the one that makes the power at lower RPM.
Mark, that makes perfect sense! I once owned a 1989 Ford F-100 1/2 ton pickup, under the hood was a 4.9 inline 6 banger(300 ci) I was disappointed in the mileage it got, I owned it for 3 yrs, it wasn’t a lemon, but had a few problems so I traded it! I traded up to the same truck but a F-100 XLT Lariat with a 5.0(302) V8. Both had the 5 speed manual tranny. The 89(4.9 6cyl) got about 12.5 mpg, the 91 (5.0 V8) got a whopping 15.5 mpg! I was amazed!
 
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