hsv headers

[W45H1NGT0N]

hey guys,
i have recently acquired a set of hsv headers (vx i think) and was wondering if they will fit my vy ss ute without any cutting or welding? or will the cat pipes just need to be shortened or lengthened?

cheers

[W45H1NGT0N]

??? anything guys ???

[sweefu]

I know that vt-vy v6 headers all clear the chassis/block mate.. but not sure if this applies to the v8 or not

[W45H1NGT0N]

ok cos yeh all the hsv v8 headers come up with vt-vz as in thats when they will suit... i think?!?!?! jw if any part of the exhaust will have to b modified to make them fit?!?!

[Harrison]

Well...

VX/VY are both GEN3 right? i could be wrong but i'd assume you should be fine..

[Not_An_Abba_Fan]

Look at the 2 bolt fitting on the flange where the engine pipes would bolt up, if it is a flat flange rather than a cup style flange then your existing pipes will not bolt up. I'm pretty sure the HSV's use the flat style flange.

[W45H1NGT0N]

ok yeh these are gen 3 v8 extractors and from what i can tell its a cup style. these could even possibly be HM headers

[Not_An_Abba_Fan]

It must be the earlier HSV's that use the flat flange. They should fit then.

[W45H1NGT0N]

ok kool so i shouldnt have to lengthen/ shorten the cat pipes?

[Not_An_Abba_Fan]

No, you shouldn't have to.

[W45H1NGT0N]

ok sweet as

[monaro327]

Wrong you will have to change the length of the pipe from the cat to the header. i fitted some hsv headers to my VY SS ute. the hsv headers are alot longer then the standard i was lucky to buy the cats and headers as a set so was a straight swap for me. the hsv cats also have a larger diameter pipe after the cat.

standard cats vs hsv


Pas side in.


stock headers vs hsv had already fitted passenger side.


drivers side in.

[Surfwagon]

The later HSV VY2 285 extractors which are quite short will fit in place of the std headers but the VT2-VY1 HSV extractors were longer and required different length cat pipes.
The 2 ebay ads show the 2 different types.
Early long style.
HSV 4 into 1 extractors - eBay Extractors, Exhausts, Car Parts, Accessories, Cars, Bikes, Boats. (end time 22-Jun-10 22:17:55 AEST)
Later Short style.
HM Headers: Holden/HSV MONARO VY II - VZ II 5.7L & 6.0L - eBay Extractors, Exhausts, Car Parts, Accessories, Cars, Bikes, Boats. (end time 03-Jun-10 09:05:06 AEST)

[W45H1NGT0N]

ok so 5 points to the first person to find a set of hsv shorter cat pipes(for longer headers) or if anyone on here is selling them?

also what are the tube diameters for the hsv headers(long ones) if anyone can get them for me that would b great

[Surfwagon]

According to HSV the long headers (250,255 &260kw) are 41mm, 1 5/8" and the short (285) are 44mm, 1 3/4".
Not sure about the 300kw C4B enginebut I think from memory it uses the same headers as the earlier version 41mm.

[W45H1NGT0N]

ok what about the end that connects up to the cats (pipe diameter)
and where'd you get the info from?

cheers

[monaro327]

early hsv headers use a 2 1/4 collector later ones use a 2 1/2.

[Vt_vic]

hey man i got some pacemaker try y's if ya interested and im in perth

[W45H1NGT0N]

nah too late buddy i got mine off ebay for $100 the other day just waiting for them to b sent