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.

 

How about 317 heads cux im going to turboed

 

no you arent

 

Im trying to understand. You mean if I tune for 370 will better mpg not killer. I plan to run with turbo. Suppose to make some better mpg on 370 right? I know if you floor to much it will eat up gas. Just like drive as regular it will be better right?

 

If your going to do it, I would do the 370.. Your going to spend about the same to do both. So go with bigger cubes for close to the same price...

 

you arent either

 

 

So cant use 317. Need other L92 for good setup turbo?

 

I might stick with 370 from texas-speed if they sell cheaper. But Im kinda afraid if it would be killer gas. Because this is my daily drive. Thats why I just curious about MPG. Also want to compare with stock 5.3 and 6.0 mpg


Check-
http://speed-eng.com/store/lq9-engine-block-p-8772.html

http://www.texas-speed.com/shop/item...d=683&catid=83

Any other link you know of that will be cheap or whatever it is. Just want to see that engine/ heads etc already built up just ready to go put in truck and play.

 

the 6.0 will get significantly worse mileage.