FIT Rockers VY S2

[Raptorsc]

Tony

Quick question, your website says the FIT rocker cannot be used on VY S2, how is the valve train different that they don't fit?

Thanks

[Surfwagon]

I believe there was a slight change in the casting of the head (by GM USA) with slightly less clearence around the pushrods when running extra lift rockers.
Although Holden changed to the Alloytec with the VZ the Ecotec in the VY11 is the latest version from GM in the states which still uses these engines.

[Raptorsc]

Yes, just had conversion with Tonsta and exactly as you say. Some motors can be ok some not. We will see if they fit ok on ours, well worth a try since they are an exceptional upgrade.

[WAGON MAN]

Here you go

Originally Posted by Tonsta V6 S/C

Our FIT 1.9 Rockers are not suitable for the VY Series II Ecotec or Supercharged V6's as Holden have changed something in the valvetrain which subsequently makes the rockers make a "ticking" sound after install.

We feel Holden possibly ran out of one of the valvetrain components, maybe valve springs, retainers, valves, lifters, collets ... etc. we don't realy know which, and because they were finishing up production of the Ecotec and Super6's in favour of the upcoming Alloytech, they probably figured doing another production run of 100,000 items of valve, spring, collets, or whatever, probably wasn't feasible as they wouldn't require that many ... just ended up substituting a component from another type or series of engine in it's place.

Whilst this substitution hasn't seemed to affect the regular factory stock rocker operation, the extra lift translated from our FIT 1.9 Rockers creates some anomaly that results in the "ticking" sound experience in 2 of our customer cars.

We returned the the stock rockers and the ticking sound was gone ... so we are baffled as to which of the valvetrain items is causing it. We will probably figure it out over time, but at present we are stumped !!

We have been producing these rockers for 5 years straight and never ever had an issue. With all the engines from VS, VT, VX and VY Series I they have worked perfectly, it's only the Series II that seems to be affected.

Hopefully we will work out a solution in time, but for now we advise they are not available.

Hope this helps.

Regards

Tonsta

[Raptorsc]

FIT 1.97s now fitted to our car, Series 2 VY V6. Very good!