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Opinions please, what mpg for 370's or 408's?

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Old 05-04-2008, 03:02 PM
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Originally Posted by Spoolin
Just a shot in the dark here but I would imagine a 408 would get better mpg?? My thinking is if you drive it conservatively when not racing then low end Torque of a stroker 408 would do wonders for the stop and go grind of DD'ing? I'm probably missing something to this equation though.

JFYI...I get 14-15 mpg with my T370 so I'm not complaining. Hopefully Thunder will chime in with what he was getting with his T408.
Spoolin, 14-15MPG, is that city or hwy? My sis-in-law CC 1500HD got 12.6 avg, bone stock. And u have power to spare.

Originally Posted by ZO6Ted
And for the future, I am planning a 6L90 when it's available as a turn-key swap.
Who said turn-key swap?!? This will be very interesting combo if u go thru w/ it. I guess that's 1 advantage the NNBS have over mine. Good potential tranny swap material.
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Old 05-04-2008, 07:39 PM
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Mine is the classic '07 but when it's available, if it's all that, I want what I want.
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Old 05-04-2008, 11:02 PM
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Originally Posted by fastnblu
Spoolin, 14-15MPG, is that city or hwy? My sis-in-law CC 1500HD got 12.6 avg, bone stock. And u have power to spare.
That's hwy and that's most of the driving that I do...LA is all fwy driving. I was getting 21-22 with my truck stock + 5.3 with 3.23's.
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Old 05-05-2008, 09:14 AM
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what are the cc's of the l92?
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Old 05-05-2008, 02:44 PM
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I think they are ~70cc's.
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Old 05-05-2008, 04:56 PM
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Yes, I believe they are 70's, however I decided to go a different route. This afternoon I ordered a 9.5 cr 370 short block. Thanks to you guys and all the great info from this and some of your other threads lately, I spec'd wiseco, hellfire rings, and callies compstar. I also ordered some Patriot Stg 111's with 2.08/1.60's, couldn't really afford anything else right now. That should get that puppy movin! Thanks again for all of your replies. I really appreciate all of you guys help.
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Old 05-05-2008, 09:08 PM
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That sounds like a very stout new engine. Congrats.
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Old 05-06-2008, 03:37 PM
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Hey, my builder said I would be better off with 2.055, 1.57 valve sizes due to shrouding I guess. LQ9's spec'd for 68cc. Does that sound right?
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Old 05-06-2008, 05:23 PM
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Originally Posted by Spoolin
...LA is all fwy driving. I was getting 21-22 with my truck stock + 5.3 with 3.23's.
So stop & go, huh? Aren't LA freeways like drivin in the city, bumper - bumper, a constant PITA? That's decent mileage w/ a 5.3, must be them 3.23s.
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Old 05-06-2008, 05:26 PM
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Originally Posted by ZO6Ted
Yes, I believe they are 70's, however I decided to go a different route. This afternoon I ordered a 9.5 cr 370 short block. Thanks to you guys and all the great info from this and some of your other threads lately, I spec'd wiseco, hellfire rings, and callies compstar. I also ordered some Patriot Stg 111's with 2.08/1.60's, couldn't really afford anything else right now. That should get that puppy movin! Thanks again for all of your replies. I really appreciate all of you guys help.
Ted, u already bored w/ your current setup? It's didn't seem that long ago, I read about when u boosted the truck.
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