346 vs 370
10-12-2009, 08:31 PM
#22
Baltimore Whore
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I am running a blown 6.0(364) I get about 14-15 on the highway, around 9mpg city driving. For some reference...
Find a good used block. 700 is a lil much in my eyes.. Also the 370 block that TSP sells it with eagle rods.. I wouldn't run eagle rods..
Find a good used block. 700 is a lil much in my eyes.. Also the 370 block that TSP sells it with eagle rods.. I wouldn't run eagle rods..
10-12-2009, 08:54 PM
#23
go 6.0 it has a 4" bore and can use heads with bigger valves, like l92 heads and those heads flow really well, it would have more potential. the 5.3's cylinder walls get kinda thin when boring out that much, and the block has to have been casted really well or it cant be bored out all the way because there would be a thin side to the cylinder. there is alot more money involved with stretching out a 5.3.
10-12-2009, 10:04 PM
#25
l92 heads have thinner decks than the 317 heads. Several guys on tech have had issues with them when using s/c or t/c. If you are gonna go 347 use a ls1 block. It will save you about 80 lbs. For reference I get about 14-15 mpg around town and 16-18 on the highway. I had a 370 setup for a while and it was in the 8-12 mpg range.
10-12-2009, 10:18 PM
#29
TECH Senior Member
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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.
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.