LS1 roller rockers

[VX SS 340 HP]

HI i have herd alot about roller rockers being used on V6s alot but i dont know much about the LS1 roller rockers...Some info would be great...
- What ratio would best suit a stock cam engine making 340hp at the wheels
- how hard are they to fit DIY...
- Would a fixed ratio or adjustable ratio be best and what is the differance
- Prices
- Brand (Are Yella Terra best)

[GenReaper]

LSX already have roller rockers just not roller tipped.
LSX rocker are lighter than aftermarket rockers so better on valve train.
Not worth buying aftermart rockers, spend your money elsewhere.

[BradSV8]

Have seen the stock units rev to 9k with a big cam, only reason to change em is if you want to go for a solid cam.

[WogBoyz]

i looked at going high ratio rockers with a small cam to suit for my ve, but have been told not worth the money. Its just better to get a slightly bigger cam (still small 2300rpm to 6000) and get better gains for cheaper, for my case anyway

[Darcon666]

HI i have herd alot about roller rockers being used on V6s alot but i dont know much about the LS1 roller rockers...Some info would be great...
- What ratio would best suit a stock cam engine making 340hp at the wheels
- how hard are they to fit DIY...
- Would a fixed ratio or adjustable ratio be best and what is the differance
- Prices
- Brand (Are Yella Terra best)

U have a stock LS1, 5.7, 346cui in a VX with 340rwhp/255rwkws....

Answers:-

1.8:1 with stock pushrods / 1.7:1 with upgrade pushrods(which I would do anyway...) and Dual springs with stainless retainers/locks.
Dead easy, unless you also do springs/rods/retainers/locks as well.
Fixed.
Seen them as cheap as $550 --> $1K depending on quality.
YT are the leaders in Australia and would stick with them.

Disclaimer: I am NO mechanic/engineer so all advice is just shite... talk to a qulified LS1 mechanic you trust.

[cracker]

factory 2nds direct from yella terra, $250 im not complaining
made a difference, made it sound abit meaner and gave abit more throughout the rev range.
spun a realistic 234rwkw
with 1-4's, no cats,twin 2.5" and gts intake with a mafless tune, through a 6 speed.

[GenReaper]

Have seen the stock units rev to 9k with a big cam, only reason to change em is if you want to go for a solid cam.

Bingo, or unless you want bragging rights

[cpbait]

Have seen the stock units rev to 9k with a big cam, only reason to change em is if you want to go for a solid cam.

Have heard similar from a couple of places iv spoken too, a couple of places said they've got big cam/hp cars running factory rockers and no problems, had the odd person say that the factory rockers are no good and leave needle bearings everywhere, but majority of cars iv seen/read about out there all seem to be running factory rockers with the odd couple running the YT 1.8 ratio rockers instead of a cam.

[Kingston_99]

not worth it, spend your money on better upgrades that will make a difference.
im runing stock rockers with a cam.

[ejukated]

depends on whether you're after an easy mod that you can install and remove when you sell the car... you can get about 254rwkw with 1.8 rockers and a tune to suit. Couple of hundred more you could have a cam and more power again but then you also have to do more work to install it. You can see the difference between mafless rockers and no rockers here 1.8 High Ratio Roller Tipped Rockers to suit LS1

[cracker]

theres no way in hell your going too see 254 rwkw with basic mods and rockers.

[Darcon666]

theres no way in hell your going too see 254 rwkw with basic mods and rockers.

^^^^^^ Agreed... Stock LS1 and the only thing changed is rockers & tune, not a chance.

Now if it's an LS2/3 and has had a re-tune/FULL Exhaust, springs & pushrods .... 220/30 even 245(freak Engine...) and the rockers - and it's a MAYBE from me(I could be wrong and the Dyno is a "Happy" one...)

[immortality]

MACE sell re manufactured stock rockers. 1.9 ratio (standard 1.7) check there website

[Vt_vic]

ive seen quite a few tune and exhaust ls1's making 340rwhp its a very high number and overinflated but there are a few around

[cracker]

exhaust tune, intake and a mafless, should expect 220-240rwkw anything more is just bull shit

[2DIE]

Back on topic, it wont be massive gains but they will have gains. If you plan to get a cam down the track I wouldn't worry about high ratio rockers.

HIGH RATIO ROLLER ROCKERS TO SUIT VT-VZ LS1-LS2 V8'S - Mace Engineering Group

For $475 its one of the cheaper options for more power, I don't know about the V8s but for the V6 its the 2nd best thing next to a cam at quarter of the price.

[MACE]

We haven't tested 1.8:1 rockers, we've done 1.9:1, 2.0:1 and 2.1:1

The latter two require the cylinder heads to be modified around the pushrod area.

Gains we got on a mainline dyno were 11, 13 and 8rwkw respectively.

These tests were done on a bolt on NA VT LS1. Hopefully sometime this year we should have results on a L76 engine so that should be interesting

Depending on the ratio, rockers as a bolt on item definitely work. Not as well as a larger cam, but then again everyone's requirements and budgets are different.

Cheers,
Steve

[ejukated]

Ive personally tuned 2 ls1's with rockers, full exhaust, OTR and mafless. The manual one made around 253rwkw and the auto one less (cant remeber the exact number). I know that if you have the mafless tune spot on then add rockers you run pretty lean up top which indicates the VE increases by a decent amount with rockers. I wouldnt reccomend running rockers on a regular mafless tune unless your mixtures are pretty fat to start with.

Be good if anyone else has dynosheets from 1.8s and a tune to suit to compare.

[Darcon666]

Managed to dig a little and found that the vehicle used originally had 241.9rwkw(So DEFINITELY NOT a STOCK LS1 from all accounts...) then 1.8 installed which took it up to 253.4rwkw... so only an increase of 11.5rwkw.

Sooo.... I stand by what I said.... STOCK/FACTORY LS1 + 1.8/1.9 Roller Rockers and a MAF tune does not = 253rwkw