i got a bone stock 5.3 with an LS1 cam out of a camaro, pacesetter LT's, stock truck intake and TB. It also has 3:73 gears, th350 with 35-3800 convertor. The car is a g-body it weighs 3490# with me in it. The best 60ft was 1.80, 8.02 1/8th and 12.62 1/4 mile

 

That was with all stock suspesion meaning straight from the factory.. well i have since put tubular upper and lower controll arm in the rear with a 2" drop spring and for the front competition engineering 3 way adjustable shocks in the front. Since these mods my 60ft sucks.... now the best 60ft is 1.95-2.0 ...any answers please

 

What kind of tires are you running?

 

By lowering the car, your IC has changed. Are the upper control arms adjustable? You may need to review your suspension geometry to see where it ended up. It is very possible it is not applying force to the rear wheels like it was before. It is also possible your tires are worn out, its hotter out and track prep was ****, etc... etc...

Throw out some more details on your set-up and we can see how we can help.

Dave