1 5/8 or 1 3/4 headers
#21
TECH Enthusiast
These aren't HEmI motors
Can't compare apples to ******
Putting a 1 5/8 header on a 4.8 is a **** up
And if OP plans to go with a health 6.0 the 1 7/8 will be choice
Now a badass 6.0 will love 1 7/8 stepped to 2"
These motors need to breathe...minimal for a 4.8 or 5.3 should be 1 3/4
Can't compare apples to ******
Putting a 1 5/8 header on a 4.8 is a **** up
And if OP plans to go with a health 6.0 the 1 7/8 will be choice
Now a badass 6.0 will love 1 7/8 stepped to 2"
These motors need to breathe...minimal for a 4.8 or 5.3 should be 1 3/4
#22
Formerly ScreamingL
I've saw Dyno and track gains going from a 1 3/4 to 1 7/8 on a 6.0
This **** isn't new it's been done plenty of times
Hell awhile ago there were 6.0s with 2" primaries
So if you want to talk full of **** then look no further then the man trying to push try Y setups and 1 5/8
Before you come at me spend time on yellow bullet ls1tech ls1trucks and bunch of other LS sites
We're not referring to some SBCs and modern HEMIs suck compared to a LS
I spend enough time on the Dyno to know what gains and what doesn't on these motors
This **** isn't new it's been done plenty of times
Hell awhile ago there were 6.0s with 2" primaries
So if you want to talk full of **** then look no further then the man trying to push try Y setups and 1 5/8
Before you come at me spend time on yellow bullet ls1tech ls1trucks and bunch of other LS sites
We're not referring to some SBCs and modern HEMIs suck compared to a LS
I spend enough time on the Dyno to know what gains and what doesn't on these motors
#23
TECH Enthusiast
I've saw Dyno and track gains going from a 1 3/4 to 1 7/8 on a 6.0
This **** isn't new it's been done plenty of times
Hell awhile ago there were 6.0s with 2" primaries
So if you want to talk full of **** then look no further then the man trying to push try Y setups and 1 5/8
Before you come at me spend time on yellow bullet ls1tech ls1trucks and bunch of other LS sites
We're not referring to some SBCs and modern HEMIs suck compared to a LS
I spend enough time on the Dyno to know what gains and what doesn't on these motors
This **** isn't new it's been done plenty of times
Hell awhile ago there were 6.0s with 2" primaries
So if you want to talk full of **** then look no further then the man trying to push try Y setups and 1 5/8
Before you come at me spend time on yellow bullet ls1tech ls1trucks and bunch of other LS sites
We're not referring to some SBCs and modern HEMIs suck compared to a LS
I spend enough time on the Dyno to know what gains and what doesn't on these motors
I can't help that you are too blinded to understand the effect of having header primaries that are too big. I have seen a 500 hp 406 small block lose 47 ft/lbs of torque at 2,600 rpm going from 1 5/8" headers to 1 7/8". The dyno was done after the car slowed down at the track with the larger primary tubes. I had 14 gauge 1-3/4" primaries on my Titan but I was making alot more power than a stock 4.8 or even a 6.0L for that matter.
#24
1 5/8 or 1 3/4 headers
Hp and torque below 5k is the name of the game for me i never rev higher than that to keep my trans happy. Even torque more so than hp because the 4.8 is small and the truck is heavy need to make all the torque improvements possible
#25
Formerly ScreamingL
1 5/8" Tri-y will build torque in a stock 4.8 and that is what the man is attempting to find.
I can't help that you are too blinded to understand the effect of having header primaries that are too big. I have seen a 500 hp 406 small block lose 47 ft/lbs of torque at 2,600 rpm going from 1 5/8" headers to 1 7/8". The dyno was done after the car slowed down at the track with the larger primary tubes. I had 14 gauge 1-3/4" primaries on my Titan but I was making alot more power than a stock 4.8 or even a 6.0L for that matter.
I can't help that you are too blinded to understand the effect of having header primaries that are too big. I have seen a 500 hp 406 small block lose 47 ft/lbs of torque at 2,600 rpm going from 1 5/8" headers to 1 7/8". The dyno was done after the car slowed down at the track with the larger primary tubes. I had 14 gauge 1-3/4" primaries on my Titan but I was making alot more power than a stock 4.8 or even a 6.0L for that matter.
#26
TECH Enthusiast
Actually I am not alone. Looked up several people running the Thorleys on 4.8s and 5.3s and not a one of them said they did not feel a torque increase. It doesn't matter what engine you are running HP is HP and a ~300-400 hp engine will make the best torque curve with 1 1/2 to 1 5/8" primaries, maye 1 3/4 if it is turning 6,000+ rpm. Physics do not suddenly change because the "Almighty dyno queen" LS engine is attached to the header tube.
#27
Formerly ScreamingL
Actually I am not alone. Looked up several people running the Thorleys on 4.8s and 5.3s and not a one of them said they did not feel a torque increase. It doesn't matter what engine you are running HP is HP and a ~300-400 hp engine will make the best torque curve with 1 1/2 to 1 5/8" primaries, maye 1 3/4 if it is turning 6,000+ rpm. Physics do not suddenly change because the "Almighty dyno queen" LS engine is attached to the header tube.
to the OP dont restrict the truck for future plans, youll only be spending money more then once if you do
#28
TECH Enthusiast
More than up to par when it comes to engines. If those large primaries work so well, better than a more reasonable primary size where are you time slips and dynos? I have used 1.5" primary shorties on an engine making close to 400 hp and it pulled strong from off-idle to 6,000 rpm. 1 5/8" would have been better but were 3x the cost.
#29
TECH Enthusiast