Since yesterday's flat tire thing i had to drive my old 99 Sierra 5.3 RCSB stock luckily we havent sold it.

Tonight i raced a 03 Silverado 4.8 RCSB stock
We raced from 30 and i won by a fender.. I had my tow/haul button to see if theres an advantage with that. Idk if he had it on.
I didnt know they were that quick. how much HP do they have.

We also did 2 races from a dead stop.
1st race i didnt want to burn my tires a bit because there were people in a building beside the road. I rev to about 1400 rpms then on 3rd honk i take off and spin til a little in 2nd gear and lose.
2nd race i burn my tires and rev to about 1400 rpms thinkin that will solve the problem. It doesnt i still spin!. should i lower the rpms to about 1000?

 

gotta love the 4.8, they have about 285hp at the crank and the 5.3s have 295 at the crank STOCK, ive gotta 4.8 and love the thing, did u guys stop and talk any... and when u say stock u mean stock wheels and tires right?

 

ya.. we are good friends. he just bought the truck today lol.

 

Btw how much HP does a 6.0L put out?

 

LQ4 is 300 at the crank i think. LQ9 i believe is 325 or 345.

 

Thanx..........1 more question. what are the difference between the LQ9 and LQ4.

 

One has a "9" in it, and the other has a "4" in it....LMAO.

Not exactly sure.....programming, rods, maybe pistons (higher comp. ratio), someone else will tell you for sure though.

 

I think higher compression and probably a different cam.

 

LQ9= higher compression flat top pistons / beefier rods

LQ4= lower compression dished piston / not so beefy rods

Cams are the same (99% sure)
Heads are the same
Everything else is the same (except tuning)

 

There's got to be something other than just compression, it's seems unlikely that a little more compression could make 45hp. Maybe someone else will chime in.