00Streak

was looking at kooks, whats the difference between a reg 1 7/8 header compared to a stepped 1 3/4 , 1 7/8 both with 3" collector. is stepped better? and why.
TIA
S

5POINT7

It is stepped for better clearance and better fit against the head. Doesn't really matter, though. Why waste money on Kook's, they're ridiculously overpriced.

z28hokie

The reason for stepped tube headers has nothing to do with clearance.

Because of the transition between primary sizes it allows for increased torque in the low and midrange without giving up power on the top end- basically it aids in preventing reversion as well as a whole bunch of other physics issues I won't get into details of.

cm02WS6

You won't see the benefit of the stepped headers without a lot of power. Until you get a set of ported heads and a fat cam, 1-3/4" primaries will do more than enough.

KrazyDan

this is what they have on tt performance:
Here is our header recommendation chart:

1 3/4" - Bolt-on cars, heads/cam cars
1 7/8" - Big cube motors
1 3/4" to 1 7/8" stepped - Big cams, nitrous applications, forced induction
1 7/8" to 2" stepped - Race cars only - big cubes and/or lots of nitrous (Note: They have 3 1/2 collectors, upon special request we can make you a y-pipe to have 2x 3 1/2 reducers added to 3" to fit the y-pipe -

Beast96Z

iTrader: (21)

Obviously the primary tubes start out a 1 3/4", then about half way down, they enlarge to 1 7/8". This produces a scavenging effect that actually aid in pulling air from the chamber instead of it being forced out. Like the other said, there is really no need for anything bigger than 1 3/4 unless you are going big heads/cam and a power adder.

FireHawk22

I got 383ci stg2 heads should i go for 1 7/8,and
what is in my car is hooker 1 3/4.

jrp

iTrader: (16)

when you want the best whats cost? you want to talk over priced look at SLP.

Beast96Z

iTrader: (21)

The 1 7/8" would make more power assuming your above 450rwhp or so. If not running any power adders, you might want to stick to the stepped headers.

Scoobie

iTrader: (8)

I am in the process of building an All Forged 347 motor with 11.5.1 compression, Stage 2.25 Absolute Speed 6.0 Heads, Ported LS6 intake, 82mm TB, TTP equalizer Cam and every bolt on including, water pump, rocker arms, LPE driveshaft, so on. I will be picking the car up on April 9th. I had been running Hooker 1 3/4" headers for the last year. I replaced them with a new set of Kooks 1 3/4" into 1 7/8" Steeped Headers. I ONLY did this because of the power the Big Cam and Big Heads are going to make. I would not waste the money unless you plan to be pushing a lot of Horsepower through a stock Cube Motor. This is what both TTP and Kooks recommended for my set up.

z28hokie

Hedman has a set of stepped tube headers out this month. They look around the right size for 350-383 sized motor, available coated for $260 or so...

They have pretty small primaries (1-1/2" stepped 1-5/8"), but I'm expecting a jump in torque as a result- with minimal HP lost...

(obviously- these are for a stock displacement to mildly stroked, N/A car, with maybe heads/cam...etc)