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Old 08-31-2006, 01:51 PM
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fuel economy ??

i know this seems like a dumb question but here goes,, i have a sbc 408 {bored 400 } comp 10.7,, super victor manifold,, dart 230 heads, 1 3/4 headers. solid cam 252-260@ 50, holley 950hp carb,, converter is 3800, th400 box, 3.89 gears ,, what sort of fuel consumption mpg would this combo get,, at the moment it is doing around 9-10 to the gallon... is this normal or do i have a problem

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Old 08-31-2006, 02:04 PM
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Depends on what it is in......I have 3 350s all 4bbls, mostly stock, headers, etc..............One gets about 17, one about 19.....................and, then there is the 359 in the motorhome....It gets 12, if I am lucky..................

The stall converter and 3.89 gears are going to drag it down, so 9-10 doesn't sound out of line.
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Old 08-31-2006, 03:16 PM
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I have a 362 sbc with 11:1, 244 @ 0.050", 3.90 gear, GM T5 5 spd, 200cc dart heads in a 2500 pound car. It gets over 20 on the highway and mid teens around town. Gears and weight have a huge effect on mpg.

My 4200lb truck with a 454, 206/212 @ 0.050" cam, th400, 1500 stall, and 3.08 gear gets 7 to 9 mpg in the city and 12 to 14 on the highway. I'm thinking BBC's don't get very good mpg. When it had a simliar built sbc, it got 10 to 12 city and 16 to 17 highway.

Judging by your engine combo, stall, and trans type. I think you are doing pretty good. What is the car weight and how much city driving do you do?
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Old 08-31-2006, 04:36 PM
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My 406, which is much milder than yours got 12-14 mpg highway at 60-65 mph and a lot less in the city. This is with 3.73's and a 4 speed in a 3400 lb car. I installed a Tremac TKO600 5 speed and now get 24-26 highway at 70 mph. What your getting sounds about right to me.
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Old 09-01-2006, 12:36 AM
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car weight is 3600lbs and i live in the centre of london, england.. the mpg 9-10 is when in town mainly. roughly what would be the increase when cruising on a motorway{freeway}... the car runs low 11s and i am happy with it,, i just wondered if it is normal mpg
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Old 09-03-2006, 02:42 PM
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Just a thought... In England you use the Imperial gallon (or used to anyway, like in Canada), stateside they use US Gallons, they're smaller. 5 Imperial gal.= 6 US gal.
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