jgpblack04

13.83 without the 20s! that sucks they should run whay better than that theres no way they are that slow they should run a little better then that with the 20s! that guy you seen must of spun or did not know how to lawnch or something i mean guys with bone stock lightnings that are heavier and have less horsepower run 13.80s all day it does not make any sense

O3GMC

take the 'rw' out and it might be possible

O3GMC

I wouldn't say they have less hp, if it was any less it might be by 10hp or so. A stock L will dyno 350 rwhp and 420tq. A stock JG might possibly put down that much hp but not that much torque.

jgpblack04

03gmc the lightning is still heavier and i now for a fact that the joe gibbs is a little faster but all i was saying is that 13.80s seem off for the joe gibbs without the 20s and with smaller wheels and tires they should run lot better than that i mean you have a radix on your truck right and i know with out all of your other mods your truck would run better than 13.80s! right i would hope so.

GMC_DUDE

I did a Google search on the JG trucks a few months ago when I installed a RADIX on my truck. For the 4.8L it is indeed 390 CRANK horsepower. Super Chevy may have got confused, I don't know. (Someone else do a Google to confirm/refute this?) My 4.8L w/ the RADIX puts down 314 Rear Wheel HP, so 390 Crank HP would be about right. Keep in mind though, that this is SAE NET HP, which is approx. 20% less than the SAE Gross numbers which were used in the 1960's.

GMC_DUDE

Sport Side

iTrader: (6)

i've heard 395 at the crank being underrated for the JG's 5.3 w/ charger

v8

iTrader: (10)

when they first came out ran into a guy at the track that had one with 400 miles on it and he manualy shifted the truck and ran a 13.7 at 98 or 99 mph

jgpblack04

now v8 that sounds more like the truth

jgpblack04

that was the 5.3 right v8.

v8

iTrader: (10)

yes it was, factory 20 , stock pulley, 5.3 , auto