You are preaching to a crowd that not one soul truly cares about your 350....You re better off on another site like GM fullsize

 

lol...

 

Definetly more left in the tuning .. once the tune is correct you will have a sotp increase from idle-

 

Keep thinking your LS is so much better for what he is looking for. Header sizing is not a hard concept to grasp and smaller primaries build torque in the lower rpm ranges even on a 6.0L. The 1 3/4" POS, non fitting Pacesetters I put on my Hemi didn't gain anything until I spun that engine to the moon with open exhaust. It was a bigger engine, with bigger valves, better flowing heads and a had more cam than a LS at 265/265 @ .006, 212/212 @ .050", .540/.540" lift, 114° LSA and 110° ICL. Pushed 5,300 lbs to a 13.59 @ 98.40 on 85 lb each P305/50R20s and 20" wheels. Took a 3,400 rpm converter, 4.56 gears, open exhaust and 6,800 rpm upshifts to do it though. I ditched the pacesetters and put stock SRT8 Jeep manifolds into 2.75" dual exhaust piping and ran within 0.08 seconds and 1 mph of the open header setup through cats and full exhaust. Torque on the street was phenominally better with the improved scavenging as well.

 

Again no body cares ..........take some advice move on to GM fullsuse where they will listen to that nonsense you speak....all you're doing is wasting energy

 

I KNOW that I AM RIGHT when it comes to headers and primary size for a stock 4.8 and 5.3. Plenty of information out there on the subject if you take the time to look for it. Plenty of dyno test that show low-end torque loss with larger tubes with gains over peak torque and toward redline. Saw one test with up to 40 ft/lbs lost at 2,500 rpm by simply using too large of a header primary. Too small of a primary is less detrimental than too large of a primary. You are only talking about 294 and 323 cubic inches and heads that flow 240 cfm @ .050, not exactly highly tuned race engines. I have seen 550 hp 7,000 rpm 406 small blocks not gain anything up top from 1 7/8" headers compared to 1 3/4" and gain very little over 1 5/8" headers. The 1 5/8" headers made around 60 ft/lbs more torque though. Guess which setup ran faster in the car!!! The one with more torque! Not a hard concept to grasp. With the stock driveline the more average torque you make, the better the vehicle will run. Peak HP means NOTHING in a truck that is 5,000+ lbs, has the equivalent of a 3 speed transmission with an OD plastered on back, stock low stall torque converter and tall overall axle gearing.

 

The only thing you are doing is pushing the guy that is having a problem related to lack of scavenging away from the problem with his setup....LACK OF SCAVENGING at lower rpms due to too large of a header primary!!!!! Not everyone runs flat out, wide open throttle to the redline and has a heads/cammed engine with a loose converter and lower gears. Smaller primaries are ALOT better for part-throttle driving as well where exhaust volume and velocity is much lower.

 

Again you're speaking nonsense, did you really wake up one day and say "hey let's see if I can get pt.net to drink the same **** I drank so we all believe the same nonsense"
Seriously telling ya this, gotten plenty of Pms in reference towards you and the nonsense....none are listening to you

 

I had a little long winded post made and decided to leave it alone. nobody around here is impressed with a mid 13 second truck. some guys have done that with STOCK 5.3 engines.

 

Save your energy bro, trying to get thru to this fool is like trying to get an Obama supporter to not want 15$ hr minimum wage