For my NBC '99 RCSB Z71 to replace the 4.8L (has 3.73s):
- Stock Rebuilt LM7 bottom end w/ crank kit
- Comp LSr 219/227 .607"/.614" 112 LSA (grind 269Lr HR12)
- Comp dual valve springs
- Comp lifter set
- GMPP high volume oil pump
- 706 heads milled to 10.5: or 11:1, 3AVJ, possible adding 2.02 intake valves
- Nelson tune
- JBA SS shorty headers
- Magnaflow 15753 exhaust
Anyone care to guess on what numbers I'll be putting down at the rear wheels? Any suggestions?
Why shorty headers? They're useless.
1969 Chevy RCLB C10 350/TH400 SOLD
2007 Chevy RCSB 4.8 4x4 LS SOLD
2008 Chevy RCSB 5.3 4x4 LT SOLD
2010 Chevy CCSB 6.2 4x4 LT SOLD
2005 GMC CCLB DRW 6.6 Duramax 4x4 191,000 and counting
2013 FORD CCSB F350 6.7 Powerstroke 4x4
sounds pretty good except for the shorty headers(waste of money). what stall are you planning on running?
Last edited by rumblebox; 02-18-2011 at 08:10 AM.
2007 Victory (Polaris) Hammer 100ci/6spd/stepped pipes/power commander/torque tube intake/lowered
2010 Malibu 3.6vvt
2000 Formula, 6.0, LS3 heads, stall, etc, etc - SOLD
2008 CCSB 4.8 - SOLD
2003 2500HD 6.0, long tubes - SOLD
1999 ECSB 5.3, cam, stall, 2/4 drop, 05 wheels - SOLD
I know. I just don't want to shell out the money for long tubes and modify the Y-pipe just yet. She's my daily and the goal is to swap the motor over the weekend.Originally Posted by rumblebox
I'll be running the stock stall for now, I might build up the 4L60E or swap a 4L80E this summer. I'm coming from small Japanese go-karts things that sit on the ground, so the change to real power might be a bit slow for me.
Last edited by finch13; 02-17-2011 at 07:32 PM.
with that cam it will be choking with anything less than longtubes. headers arent that expensive. if you're going to go through all this trouble, what is another $360?
2007 Victory (Polaris) Hammer 100ci/6spd/stepped pipes/power commander/torque tube intake/lowered
2010 Malibu 3.6vvt
2000 Formula, 6.0, LS3 heads, stall, etc, etc - SOLD
2008 CCSB 4.8 - SOLD
2003 2500HD 6.0, long tubes - SOLD
1999 ECSB 5.3, cam, stall, 2/4 drop, 05 wheels - SOLD
Definatley just get some speed daddy headers
ECSB 2kSierra 2wd 4.8L-K&N-HPtuners-Calspeed LT's-Magnaflow-Tahoe20's-HankookRH06
waiting to go in... 3.90s, 214/220cam
I think your low end power will suffer a bit without a higher stall converter.
According to CompCams CamQuest and DesktopDyno 2003 (take that with a grain of salt), torque is supposed to peak at 2k and hold steady until about 3,500 and then start dropping off. Horsepower is supposed to peak around 4 grand and hold until 6, and that's without a tune factored in.
I've really only driven manuals, so modifying automatics is still something new to me. I'd like to hold off on tranny mods until I get a feel for the new motor. I also tow 4-5,000 lbs around once in a while and don't really want the extra heat a high stall will generate.
With a circle D 3k stall you will get all the performance you will desire and with a tranny cooler you will be fine on temps and tow just great.
ECSB 2kSierra 2wd 4.8L-K&N-HPtuners-Calspeed LT's-Magnaflow-Tahoe20's-HankookRH06
waiting to go in... 3.90s, 214/220cam
Im building a 6.0 for my DD/work pickup. It will have 243 heads, EPS 218/226 cam with 4 degrees advance ground in, and LPP longtubes. I also dropped the coin for a 2600 stall triple disc yank converter for my 4L80E. A converter with a slightly higher stall speed can actually be a benefit when towing.
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