Ferocity02

iTrader: (59)

Thanks guys. I'll be trying to fix the leak this week I hope.

TXSZ66AVLANCHE

iTrader: (7)

Just to add some info to this thread...

Recently installed a 5.3 in my 2003 Suburban, with machine work the engine is a 5.4 now, flat top pistons, 862 heads 10:5.1 CR. Currently running a 2000 Spec F body cam 198/209 .500/.500 119lsa

Left for a 1500 mile road trip with only 300 miles on the engine since it was installed, highway MPG was outstanding for a full size SUV loaded with a family of 6 w/luggage. 17.97 mpg average on 89 octane.

Now that we are home and doing mostly short city drives....holly hell, I dont even think its getting 10mpg. In case you are wondering about a LS1 cam in a 5.3? Dont do it lol

stevenc

iTrader: (1)

Something is really wrong.. Justins tune pushed my 5.3 suburban to 20mpg @ 70mph. Only mods are a CAI and cat delete.

TXSZ66AVLANCHE

iTrader: (7)

Something is not really wrong, its a heavy 2003 Suburban with 3.73 gear, stock air intake, stock cats, and stock 2.75" exhaust. Traveling by myself and without the weight of 5 other people and luggage 20mpg would probably happen. Also forgot to mention that the 17.97mpg had a 80-85 mph the entire trip.

1slow01Z71

iTrader: (36)

After driving a few of these wide split, and wide lsa cammed vehicles including my own, I've come to the conclusion that unless you're boosted they suck in both low/mid range power and mpg. The gt2-3 cam in my lq4 sucks compared to what a different cam would do.

nonnieselman

iTrader: (10)

Thats why i like my isky 215 cam.. its got the perfect split of power thru out the power band.

whats the GT2-3 spec?

1slow01Z71

iTrader: (36)

207/220 .571/.578 118.5lsa