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#26 |
Registered User
Join Date: Jan 2011
Location: Quincy, FL
Posts: 533
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Re: 454 mileage
I take it they are show tractors.
I thought about a swap last night, and if you did something like a 8.1 conversionfor are going to spend probably 3k to get it right and you will pick up 2-3 mpg, so let's use the high side. If you are currently getting 12 (for easy math) and you go to 15 then you will pick up a gallon every 60 miles, at $3.50 per gallon you would have to run over 51,000 miles to break even. $3000 / $3.50 = 857.14 X 60 = 51,428 So do it to save money is a misconception, doing it for fun or better power it can be justified because of desire, but not economics. And yes, other swaps can be done more effeceintly but the math is still there and 3 mpg is a pretty good pick up. Now an LS swap MIGHT make the math work because you will get more than 3 mpg and probably be well less than 2 grand if you plan it right. |
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#27 |
Registered User
Join Date: Jun 2006
Location: Indiana
Posts: 4,859
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Re: 454 mileage
I say go with the 454. Your 355 or 350 is not getting super great mpgs anyway. It is unlikely that overdrive will come into play pulling wagons around the farm. The deep torque at low rpms will.
My 355/350 with 3.08 gears X2 peg leg still only got about 10mpgs on the highway. So, 2x the torque and about the same mpgs? Seems good to me. In fact, I had a plan in place, but I did not get to the big block fast enough. ![]()
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'70 GMC C1500 LWB Power disc brakes. WooHoo! Posi 6 Lug Dana 60 |
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#28 | |
At the body shop.
Join Date: Aug 2009
Location: Land of fruits and nuts.
Posts: 5,212
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Re: 454 mileage
Quote:
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" That didnt make it any newer " " Dont antique the equipment " |
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#29 |
Registered User
Join Date: May 2010
Location: Lewis County, WA
Posts: 1,523
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Re: 454 mileage
My '82 K20 (454/SM465/NP205) with 4.10 gears and 35" tires gets 11mpg...loaded or unloaded, trailer or no trailer.
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#30 | |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: 454 mileage
Quote:
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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Tags |
4.10, 454, big block, nv4500, truck |
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