INTERNAL ENGINE MODIFICATIONS Valvetrain |Heads | Strokers | Design | Assembly

346 vs 370

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Old 10-12-2009, 10:45 PM
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Originally Posted by nonnieselman
man, id hate to have yalls gas mileage

i usually average 16ish in town, 22ish on the interstate, and 25 on the highway..

I would like to build a 370 in the future for either the silverado or S10, maybe one day.. if you run the right combo your tune is good you should get roughly the same mileage. i dont see why your mileage would suffer.
You have to find a happy medium between the power you want and the mpg. I'm fine with the mileage I get, especially considering the power it is capable of producing.
Old 10-12-2009, 10:49 PM
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Originally Posted by Go5.3tt06
Really wow. Which do you like 370 or 347 since You already been experince for that. Okay where can I find LS1 block? IT is IRON block right?
How much power do you want to make Luke? You know how my truck pulls at 7.5 psi.
Old 10-12-2009, 10:50 PM
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Originally Posted by quicksilverado
You have to find a happy medium between the power you want and the mpg. I'm fine with the mileage I get, especially considering the power it is capable of producing.

I agree!!
thats why i have 2 nasty switches
any combination of the 2 is fun..
Old 10-12-2009, 11:32 PM
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Everyone just nod your head and hope he doesn't make another MPG thread for another couple weeks.
Old 10-12-2009, 11:34 PM
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Old 10-13-2009, 11:13 AM
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Originally Posted by quicksilverado
How much power do you want to make Luke? You know how my truck pulls at 7.5 psi.
Yeah, I love that one when you gave me ride on yours. I don't know how much horsepower you make at 7.5 also how much for full you on 5.7 with full boost? Tell me a reason why you decide switch from 370 to 347? Mine goal is 450-650hp
Old 10-13-2009, 11:17 AM
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You could make 450 whp with a turbo - cam and your 5.3
Old 10-13-2009, 01:04 PM
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Originally Posted by Mangled03gmc
You could make 450 whp with a turbo - cam and your 5.3
I plan to run turbo on stock 5.3 for a while until I get 347 or 370 to build to swap. I want to know how much 347 able make power? I can figure out which one I will stick it. I want more power for fun and for daily drive I could switch the low of boost. That way not get killer gas like as viper! Lol
Old 10-13-2009, 01:36 PM
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if jims 5.3 torbo fairmont can make over 700 hp/tq to the rear wheels, im pretty sure you can make the same out of a iron block 347.
since everybody already said gas on a 370 sucks, and milage is a main point of the build, your not going that way.
im pretty sure after you run a turbo 347, your next step up will be 408 or 427, not 370.
Old 10-13-2009, 07:56 PM
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You can make that power easily with a an ls1 or bored out 5.3 Luke.


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