gmtechnician

i just bought an 06' rcsb 5.3L locking rearend 3.23 gears. it is completely stock for now. what 1/4 times should this truck run. im going tommorrow night but i just want to know what you guys have been seeing on these trucks.

shandy294

Is it the 295hp or 310hp version. I'd guess about 15.5 at 90mph.

gmtechnician

i think its the 295 version

2000 SILVERADO

I'd say closer to a 15 flat. And you can get the new RCSBs with the 310 5.3L?

Quik

iTrader: (7)

i ran 14.6 at 94mph 3yrs ago with a K&N filter and a muffler on street tires i got a 2.1 60' this was with 15k miles and royal purple in it. this was a 5.3,373 manual shifting it. i highly doubt the filter/muffler did much

spitfire2332

not unless the flex fuel 5.3 has 310hp. Engine options are 4.8L, reg 5.3L and flex fuel 5.3L

but while we're on the topic, I'm getting a truck just like this but with 4.10s, what do you guys think that will run stock?

gmtechnician

my truck is the z motor if that makes a difference. i know its the flex fuel but what should the horsepower be?

spitfire2332

Z motor?

LM7 = 5.3L 295hp 335tq
L59 = Flex Fuel 5.3L 295hp 335tq

there you have it... you have 295hp and 335tq

2005 Silverado

iTrader: (19)

according GM silverado owners manuals...all 5.3's are e-85 motors as well

LesPaul

Hmm the flex fuel is an option...