Any idea why SW made 1 5/8 hdrs for lt1 corvette but 1 3/4 for lt1 camaro?
08-21-2019, 05:47 PM
#1
Race Director
Thread Starter
Any idea why SW made 1 5/8 hdrs for lt1 corvette but 1 3/4 for lt1 camaro?
To me, I find this insulting.
Stainless works must find the 92-96 corvette lt1 a lesser car (and its owners more into the look of having stainless headers) to offer only 1 5/8 primaries for lt1 corvette (which are undersized for modd lt1 and esp lt4) - but yet they offer the more perf oriented 1 3/4 primaries for 95-97 camaro lt1
does this annoy anyone else?
Stainless works must find the 92-96 corvette lt1 a lesser car (and its owners more into the look of having stainless headers) to offer only 1 5/8 primaries for lt1 corvette (which are undersized for modd lt1 and esp lt4) - but yet they offer the more perf oriented 1 3/4 primaries for 95-97 camaro lt1
does this annoy anyone else?
Last edited by dizwiz24; 08-21-2019 at 05:51 PM.
08-21-2019, 09:13 PM
#5
Race Director
Just get ARH headers. You can get stepped 1 3/4 to 1 7/8 headers for an lt1
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dizwiz24 (08-22-2019)
08-21-2019, 10:13 PM
#6
Le Mans Master
guess i'm not as dumb as a rock after all.
today my son has the car in quantico, va and he says it is purring like a kitten, with a roar.
i still have the 383 stroker motor and now have a set of american racing step headers waiting for the 96 to come back home around october or november.
mama's gonna have a fast ride.
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dizwiz24 (08-21-2019)
08-22-2019, 02:08 PM
#7
Race Director
I was thinking they've been 1 5/8" for years....and, if so, here's my guess.
I think 1 5/8" primaries IS the correct size for all stock C4 Corvette (with the exception of Callaway/ZR1). That's still bigger than OEM manifolds and it maximizes street driven rpms. I also think you'll agree it's perceived that Corvette owners (generally) want to leave their cars stock...thinking it will maximize resale. (Look at how many threads we still see where new owners still worry about customizing their C4!) Whereas, Camaro owners are more likely to do anything to their cars....and probably more Camaros can be found at the strip.
I think 1 5/8" primaries IS the correct size for all stock C4 Corvette (with the exception of Callaway/ZR1). That's still bigger than OEM manifolds and it maximizes street driven rpms. I also think you'll agree it's perceived that Corvette owners (generally) want to leave their cars stock...thinking it will maximize resale. (Look at how many threads we still see where new owners still worry about customizing their C4!
) Whereas, Camaro owners are more likely to do anything to their cars....and probably more Camaros can be found at the strip.
08-22-2019, 02:24 PM
#8
Race Director
Thread Starter
I was thinking they've been 1 5/8" for years....and, if so, here's my guess.
I think 1 5/8" primaries IS the correct size for all stock C4 Corvette (with the exception of Callaway/ZR1). That's still bigger than OEM manifolds and it maximizes street driven rpms. I also think you'll agree it's perceived that Corvette owners (generally) want to leave their cars stock...thinking it will maximize resale. (Look at how many threads we still see where new owners still worry about customizing their C4!) Whereas, Camaro owners are more likely to do anything to their cars....and probably more Camaros can be found at the strip.
I think 1 5/8" primaries IS the correct size for all stock C4 Corvette (with the exception of Callaway/ZR1). That's still bigger than OEM manifolds and it maximizes street driven rpms. I also think you'll agree it's perceived that Corvette owners (generally) want to leave their cars stock...thinking it will maximize resale. (Look at how many threads we still see where new owners still worry about customizing their C4!
) Whereas, Camaro owners are more likely to do anything to their cars....and probably more Camaros can be found at the strip.Now, maybe for a lower revving, stock intake, torque-monster l98, maybe - would the 1 5/8 be desireable...
again it just annoys me the camaro lt1 is slated for the freer flowing 1 3/4, but not corvette lt1
08-22-2019, 02:28 PM
#9
Race Director
Thread Starter
my gripe about ARH headers is they are heavy. They brag about how big, thick, quality their flange is.
its made the whole rig considerably heavier than the TPIS 1 3/4 headers i had in there.
also not near as much clearance (the worst clearance issue Is the swingouts on the canton road race oil pan) either but i should expect that with 1 7/8 vs 1 3/4
08-22-2019, 02:55 PM
#11
Race Director
Do 1 3/4 really make a difference, with the size of the exhaust port, valve size and exhaust overall? Serioulsy, unless open headers, why would there be any real world difference except on a dyno run.
08-22-2019, 03:52 PM
#12
Race Director
Thats what im currently running (on my stock bot end forced induction lt1) - and i swear i gave up some low end TQ vs the tpis 1 3/4 long tubes i had.
my gripe about ARH headers is they are heavy. They brag about how big, thick, quality their flange is.
its made the whole rig considerably heavier than the TPIS 1 3/4 headers i had in there.
also not near as much clearance (the worst clearance issue Is the swingouts on the canton road race oil pan) either but i should expect that with 1 7/8 vs 1 3/4
my gripe about ARH headers is they are heavy. They brag about how big, thick, quality their flange is.
its made the whole rig considerably heavier than the TPIS 1 3/4 headers i had in there.
also not near as much clearance (the worst clearance issue Is the swingouts on the canton road race oil pan) either but i should expect that with 1 7/8 vs 1 3/4
08-22-2019, 04:50 PM
#13
Race Director
Thread Starter
Apples to apples, my car was a tenth quicker with the ARH stepped headers than the Hooker Super Competition 1 3/4 headers. Both of these should be quicker than the TPIS headers which are not equal length headers. This might be where part of the weight difference lies. There is more tubing with equal length headers. Also it probably explains the clearance issue. TPIS headers are great for ease of installation and fitment. ARH is more concerned with extracting the most performance out of a set of headers; stepped, larger tubes, equal length, merged collectors, fat flanges...
yea, thats a good way of looking at it.
and when I go 383 - there will be no question on whether they are too big or not. 🙌