355, this makes no sense... - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 08-28-2001, 12:57 AM
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355, this makes no sense...

Here's the scenario; it doesn't make any sense to me.

I've been dealing with about 9 MPG with an 89/92 mix in my `84 3/4 ton since I rebuilt a 350 for it. This past weekend I hauled nearly 2 chords of oak firewood in one load about 110 miles and only burned 10 gallons of gas (11 MPG average)!

Driving conditions were the same - level terrain, same speed, etc. The only difference is that she gets about 2 MPG more with a load. Does this make any sense to anyone? It's got me dumbfounded.

350 + .030" (355), KB flat top pistons, 76cc iron heads
Edelbrock Performer intake, new 600 cfm Edelbrock carb
headers, 2 1/2" duals, middle-of-the-road cam (not whimpy, not agressive)
SM465 (1:1 high gear), 4.11 gears, 35" tires

Is the engine finally breaking in and getting more efficient? It's got about 1000 miles on it right now.



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post #2 of (permalink) Old 08-28-2001, 06:45 AM
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Re: 355, this makes no sense...

I think you think yo got better mpg becasue you only checked 10 galons, they never seem to get as good when you check the whole tank.

does that make anysince??????


14B SF rear, Sh!t up front
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post #3 of (permalink) Old 08-28-2001, 09:53 AM
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Re: 355, this makes no sense...

<font color=purple>Yup, you didn't get a good reading. Now, if you were to drive 1,000 miles with a load & 1,000 w/o, then you'd have enough "test data" to draw conclusions. I'm guessing you didn't get the tank completely full when you filled up, or that you overfilled on the previous stop.</font color=purple>

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post #4 of (permalink) Old 08-28-2001, 01:20 PM
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Re: 355, this makes no sense...

I have heard that after the break in period that your mileage does go up a little. not sure how much, but i am waiting for that point on my new engine.

pics of the V30 which is still for sale or possible trade.
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post #5 of (permalink) Old 08-28-2001, 04:53 PM
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Re: 355, this makes no sense...

Are you sure you had 2 cords of oak? That would be 4'x8'x8' or about 4.5 tons.(3.5 if it is seasoned good, you know salt an pepper and maybe a little garlic)

Do what you have to, just get it up! CHEVY 4x4`s
post #6 of (permalink) Old 08-28-2001, 10:12 PM
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Re: 355, this makes no sense...

all depends on what kind of a cord you are talking about!!!

A face cord is 16(most common size)"x8'x8' and a bush cord is 4'x8'x8'

Ryan

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