thatguy483

I have an 03 silverado 1500 with a 4.8 that it worn out. I want to build a 5.3 to throw 500-700 whp to put in it. I have planned to use a stock 4l80e trans with high stall torque converter. 5.3 block off summit racing, stock 5.3 crank, ls1 intake manifold, either stock 5.3 or stock ls1 pistons/connecting rods (depending on if i decide to boost in the future) but still not sure on cam/heads and some of the smaller things