1.9 or 1.98 rockers?

[hoofelmuma]

hey all
im planing on getin rockers really soon and on maces website theres only a $45 diff between 1.9(including pushrods cos i got a vy) and 1.98. Will the 1.98 fit in my car? its preaty much stock v6 auto

[MACE]

hey all
im planing on getin rockers really soon and on maces website theres only a $45 diff between 1.9(including pushrods cos i got a vy) and 1.98. Will the 1.98 fit in my car? its preaty much stock v6 auto

For a VY We recommend the 1.9's (with push rods)

If you use the 1.98's there will be clearance issues with the push rods in the push rod holes through the head because of the excessive casting flashes. Holden got very sloppy with there castings when they knew the ecotec was coming to the end of the production line

Cheers

Bart

[habs420]

Steve, would you recommend 1.9 for the vx? or 1.98?

[hoofelmuma]

thanks looks like its the 1.9's then. also is it possible to get a cam later on or is there a clearance issue as well?

[habs420]

Crow cams have cams to suit 1.9 rockers. They are also on the mace site

[MACE]

Steve, would you recommend 1.9 for the vx? or 1.98?

If it's NA 1.98:1's would be the go

thanks looks like its the 1.9's then. also is it possible to get a cam later on or is there a clearance issue as well?

Sure is. We have them available on our site.

CROW CAMS TO SUIT V6'S WITH HIGHER RATIO ROCKERS - Mace Engineering Group

If you have any more questions please don't hesitate to ask.

Cheers
Steve

[DUK13Y]

Sorry about bringing up the oldish topic but better than making a new one.

For a VY series 2 (don't know if that makes any difference), would you recommend the 1.9:1's w/push rods, or 1.98:1's? Do the 1.98:1's need the additional $110 push rods too? I'd imagine they would but doesn't say they are needed.

Thanks

[MACE]

Hey DUK13Y,

I'm always happy to reply to reasonable respectful questions

In regards to ease of fitment I would go with the 1.9's with push rods.

You can go with the 1.98's (which already come with push rods in the kit), however you'll have to grind/chisel away the casting flash (which is the main problem with VY's compared to the earlier model items) inside the cylinder head where the pushrod is located.

It can be done with the cylinders heads still on the car just a bit tricky. Otherwise if you install the 1.98:1 ratio rockers without doing this on a VY then it will be noisy.

If you have any other questions please don't hesitate to ask.

Cheers,
Steve

[MR_VX]

ive put the 1:9.1 in my vx but never installed the push rods. what difference does that make?

[vxcalais_01]

None, it should be fine. THere are some pix of this casting that was left behind on the older threads. I think its due to the fact the rods flex with the higher ratio and change in angle makes them hit the extra casting. I think you chisel or scrape off while having i magnet in there to catch the bits that fall in.

The aftermarket rods may be thinner, but are definately stronger as they may be Chrome Moly. You will only gain some reliability, no performance to be had from the rod change.

[MR_VX]

arr no worrie thanks for clearing that up for me. I was consern that i was missing out of a miner 1kw or 2 lol thanks again

[MACE]

There would be a very small gain with having stiffer rods as you would be a fraction more lift. Don't think it would give you a 1kw though, unless you had really stiff valve springs.

Cheers,
Steve

[MR_VX]

no worries thanks all

[V85000i]

i have a very early VY, october 02 it was built, so would mine have the casting issues or be ok cause it pretty close to the VX.

[MACE]

i have a very early VY, october 02 it was built, so would mine have the casting issues or be ok cause it pretty close to the VX.

From experience some have been able to get away with this, others haven't on some very early VY's, generally though we'd say no.

This aside, as a bolt on rocker upgrade they arguably make the most amount of power then anything else on the market.

The main reason is the non roller tip which increases the effective ratio per given amount of lift while the roller item reduces it's effective ratio per given amount of lift. And quite as a mouse dude to the revised lifter crush

If you have any more questions please don't hesitate to ask.

Cheers,
Steve

[vxcalais_01]

i have a very early VY, october 02 it was built, so would mine have the casting issues or be ok cause it pretty close to the VX.

Take off the rocker covers and shine a torch down where the push rods go. You will see bits of metal casting etc protruding into the space. You need to place a strong magnet at the bottom(make sure you can remove it again hehe) to catch the bits you chisel off. If it falls down, it means heads off.

[Timmay33]

Looking at getting the 1.98:1s aswell.

I have a VX SII L36. Read somewhere that these may suffer from casting issues aswell, but most say it is ONLY the VYs.

Anyway, took my rockers out just to be sure and I think they look all good. What do other people think?
That is the best pick I could take.
When people say bast casting, its in the circlular hole that the push rod travels down in or it is in the triangular opening? The circular opening looks perfect to me.

[MACE]

Looking at getting the 1.98:1s aswell.

I have a VX SII L36. Read somewhere that these may suffer from casting issues aswell, but most say it is ONLY the VYs.

Anyway, took my rockers out just to be sure and I think they look all good. What do other people think?
That is the best pick I could take.
When people say bast casting, its in the circlular hole that the push rod travels down in or it is in the triangular opening? The circular opening looks perfect to me.

Hi Timmay33,

It's primarily only the VY's that have issues.

The Casting looks good. the triangular hole further down is the head gasket cut out for the push rod.

Can we use that picture in future?

Please don't hesitate to ask if you have any more questions.
Bart

[Timmay33]

Thanks.

Also, I am happy to let you use the picture.

Cheers for the reply.

[MACE]

Thanks.

Also, I am happy to let you use the picture.

Cheers for the reply.

It's a really good pic and will help to explain things perfectly