Heads before cam ??
11 Second Club
Joined: Jan 2010
Posts: 1,707
Likes: 13
From: New Orleans, LA
FWIW I had a friend of mine that was HELL BENT on buying AFR heads for his bone stock GTO a few years ago, he did it ran headers and heads with all stock stuff, he picked up nothing up top and gained a boat load of midrange torque, my stock 06 still whopped his 04's *** and he just didn't get it......as all said above, just take your time and do it right, do it once
This all depends on who ports the heads as well. LS cars are also a completely different animal when it comes to heads since they already had superior flowing heads from the factory.
I'm half inclined to slap the set of heads I have sitting here on my car before I do the rest just to see. Problem with heads before cam, as the numbers above back up, is that for $1000-1500 your only getting 300-320ish rwhp (comparable to full boltons) where for $750 (cam, rockers and springs) you can have 330-360 rwhp. I've got a set of heads sitting here and a cam sitting here, and there's no question which was cheaper and which would give more power. I'm one of the 110mph low 12s Bolton only cars.
Kgkern, most of your power was gained in the 1.7s, 11:1 and e85.
Kgkern, most of your power was gained in the 1.7s, 11:1 and e85.
I think you missed the point there lol but yes you are right
very true.......just trying to make a point lol
very true.......just trying to make a point lol
Weren't the earlier ones mechanical fans which lowered the rating because of the accessory load?
Weren't the later ones also equipped with a different intake and 10mm larger TB.
A quick googling says they changed the cats to higher flowing as well.
Also revealed the tunes differ dramatically even just from 2000-2006 not even getting into the Gen IV.
The compression ratio also raised.
So I call complete madeup bullshit on your statement FABRICATED and cherrypicked just to support your opinion here and it is about a completely different engine platform to boot so WTF are you doing posting about it anyway.
11 Second Club
Joined: Jan 2010
Posts: 1,707
Likes: 13
From: New Orleans, LA
Weren't the earlier ones mechanical fans which lowered the rating because of the accessory load?
Weren't the later ones also equipped with a different intake and 10mm larger TB.
A quick googling says they changed the cats to higher flowing as well.
Also revealed the tunes differ dramatically even just from 2000-2006 not even getting into the Gen IV.
The compression ratio also raised.
So I call complete madeup bullshit on your statement FABRICATED and cherrypicked just to support your opinion here and it is about a completely different engine platform to boot so WTF are you doing posting about it anyway.
Weren't the later ones also equipped with a different intake and 10mm larger TB.
A quick googling says they changed the cats to higher flowing as well.
Also revealed the tunes differ dramatically even just from 2000-2006 not even getting into the Gen IV.
The compression ratio also raised.
So I call complete madeup bullshit on your statement FABRICATED and cherrypicked just to support your opinion here and it is about a completely different engine platform to boot so WTF are you doing posting about it anyway.
I do believe the mechanical fan b-body LT1s were 250hp rated due to the fan load, electric fan was 260hp.
Ok let's pretend a mechanical fan places no accessory load on the engine.
That said I am finding references to the cam changing, the tune changing, the cats changing and the intake manifold and TB changed.
Found some info about the intake tract changing too.
Then there is the indisputable fact the HP changed incrementally......................
Yes the 243s added power to the 5.3l but it was a LOT less than the 35hp you are pretending.
It gained .4-.5 of compression the same year it got the heads, intake and TB upgrade gaining a total of 20hp from all of that plus whatever tuning differences there were. GM powertrain engineer tells me the later intake and TB would be worth 6hp on my 2005 5.3l so that leaves 14hp left to split up between the compression, heads, tuning and any intake/exhaust differences.
If you want to argue this PLEASE try and do so point for point.
If you feel I am wrong about the compression changing or the intake being better or the TB being bigger address those specifics.
Ok let's pretend a mechanical fan places no accessory load on the engine.
That said I am finding references to the cam changing, the tune changing, the cats changing and the intake manifold and TB changed.
Found some info about the intake tract changing too.
Then there is the indisputable fact the HP changed incrementally......................
Yes the 243s added power to the 5.3l but it was a LOT less than the 35hp you are pretending.
It gained .4-.5 of compression the same year it got the heads, intake and TB upgrade gaining a total of 20hp from all of that plus whatever tuning differences there were. GM powertrain engineer tells me the later intake and TB would be worth 6hp on my 2005 5.3l so that leaves 14hp left to split up between the compression, heads, tuning and any intake/exhaust differences.
If you want to argue this PLEASE try and do so point for point.
If you feel I am wrong about the compression changing or the intake being better or the TB being bigger address those specifics.
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