i just recently bought a 2003 silverado ext cab with a 4.8. It has 180k on it now and still runs fine. The truck seems REALLY sluggish at take off. It does feel more powerful higher in the rpm range. i am guessing this is just a characteristic of the 4.8. i would like to get more power down low in the rpm range. My question is should i put a cam in the old 4.8 or swap the motor over to something with more cubes. This will be a build on a budget.
A cam in a 4.8 will generally lose more bottom end then it will gain as far as seat of the pants goes. The best thing mod wise for it will be a stall. You will skip the sluggish take off and get right into the upper power range. A 5.3 Or of course a 6.0 will have more torque than the 4.8 so it will help. Important factor is the gears. I suspect 3.23 or 3.42s when considering the sluggish take off. Especially with the 4.8 4.10s would be dramatically better. My wish list for your build would look something like this:
1) tune/boltons
2) stall
3) gears
4) motor swap
5) cam swap
ECSB 2kSierra 2wd 4.8L-K&N-HPtuners-Calspeed LT's-Magnaflow-Tahoe20's-HankookRH06
waiting to go in... 3.90s, 214/220cam
If you looked hard enough, and dont give up, you could find a 5.3 or even a 6l for cheap. I bought my roll over from a body shop for $300 plus tow bill
cam, stall and turbo
04 RCSB 5.3, Homemade 80mm FM, TU1, TH400
Tune, Gears, Headers, cam & stall then turbo or nitrous.
2012 Ford F-150 Ecoboost Super Crew 4x4, stock and staying that way.
2001 chevy green = LS1 stock, 3k stall, 373 posi, tuned by LSX Power in CS TX
how long do you think the ol' 4.8 will last with 180k on it and just now starting to mod it?
Other than springs Rockerarm bearings and pushrods not a whole lot that wears out on these motors. The bottom end goes to 300k without blinking in many cases.Originally Posted by slow_01tahoe
ECSB 2kSierra 2wd 4.8L-K&N-HPtuners-Calspeed LT's-Magnaflow-Tahoe20's-HankookRH06
waiting to go in... 3.90s, 214/220cam
Gears, stall, bolt ons like CAI, LTs, then cam and then turbos. Yup 2. I got a 4.8 it suks down low but with, 4.10s 3200 stall and TSP 220 id does pretty good on takeoff. It will burn through 80% of 1st gear. Mine does.
4.8, TSP 220, 6L90 swap, 3400 Stall, 4.10s w/30" drag radial and T76 @ 16lbs.
Best ET 11.54@114 w 1.52 60ft
Raceweight 4905 lbs.
New timing chain also
ive been wanting to biuld another turbo vehicle. I had a turbo'd civic si and then a supra
turbo'd. my last truck i wanted to turbo but had another project that sucked up all my money. my new truck is my new project. I was looking into those trick performance kits for the truck.
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