gmblack3

iTrader: (1)

I have an 01 Z06 with 67k miles. She has seen some "hard miles" Mods are in my sig.

Its possible that I may have broke a spring as the car is idling very rough and will not run on its own for long. Will remove the plugs in the morning a do a compression test.

If its just a broken spring, I was interested in installing the 1.7 Crane Gold Race Aluminum Roller Rockers, pushrods, Crane Dual springs w/ ti retainers since Vincci has this setup on a group purchase.

I'm not going to do a cam if I don't have to go into the motor.

1. Will I need a re-tune with the install of these rockers?
2. Will I have any problems installing these myself? Have changed my own clutch so this should not be that bad.
3. Will the dual springs be ok with stock cam? I want them for my "hard driving" days.

narcszm

if you're bothering to change the springs and you want to keep your 01 Z06 cam, I'd upgrade to 1.8 rockers if you can get them at the same price. You will not need a retune with the 1.7:1 but you might with the 1.8:1. It will run pretty good without a tune, though.

you will have no trouble installing these yourself if you've done a clutch.

The only thing that stresses springs is aggressive ramp and high lift, of which you have neither. They should last quite a long time in your setup.

Stepping up to the 1.8 rockers (again, if you can get them) will give you a 5-8% power increase, so you might as well while you're in there.

gmblack3

iTrader: (1)

Thanks for your reply!

I believe the GP offers either the 1.7 or 1.8 rockers. If I didn't live 400-500 miles away from Mr Futral, the tuning part would not be a problem. I really like his tune and don't want to take it anywhere else. Plus got to pay that license fee again for LS1 edit somewhere else.

Do you think the 1.7s will give any power increase at all? Is your est for the 5-8% power increase of the 1.8s over the 1.7s or over stock?

Thanks!

narcszm

Your stock rockers are 1.7:1 The 5-8% power increase would be from stepping up to a 1.8:1 rocker.

We installed 1.85:1 rockers on a stock car and it ran great without a tune. Since the cam dynamics are unchanged the change is not drastic from a tuning perspective. You should feel comfortable driving the car without a tune, as it will run great with only springs and rockers. Then whenever you get a chance, take a drive to FMS and get a tune which will simply net you even more power.

XTrooper

That 2001 LS6 cam with its .525/.525 lift with 1.7 rockers was made for 1.80 rockers!

A set of Crane Gold 1.80 Quick-Lift rockers (actually 1.82) would increase your lift to .562/.562. That added lift will definitely earn you some nice gains.

mrr23

iTrader: (3)

1. no you will not to tune for the rockers.
2. if you are smart enough to do a clutch, then you should be able to follow the instructions on how to install the rockers and springs. get the tool to do the springs with as well. if you have an air compressor, then get the air hose with adapter also. http://www.vincihighperformance.com/superwebdeals.HTML
3. yes. i use the vinci/crane 1.8 accelerated lift rockers and dual springs on the wife's 99 formula with stock cam. been in for over a year now. here's a dyno graph showing the results:
dyno 9 before
dyno 11 500 miles later
dyno 14 10 months later

gmblack3

iTrader: (1)

Mrr23, Is that still a stock timng chain in the wifes car?

Any concerns with higher spring rates and the stock timing chain we have in the LS1/6 from the factory?

thanks!

93Polo

iTrader: (5)

I don't think 1.8 rockers and some decent springs would be a problem on the factory timing chain.

I would go ahead and do the 1.8 rockers too. LS1 speed did a build up on a Z06 ported heads, 1.8 rockers, and stock cam. Results were rather impressive but I can't find the topic on this forum.

gmblack3

iTrader: (1)

Will be calling vincci tomorrow for the

VHP/CRANE Dual Valve Spring Pkg (tit ret, hardened seats) $329.00

VHP/CRANE 1.8 Roller Rocker Arm Pkg $635.00

a VHP/CRANE valve spring tool for $100.00.

This is what I just found:

jdoyle

iTrader: (27)

my goodness thoe must be some hard miles that spring is a goner

narcszm

Just get a longer pushrod for #2 intake spring there and you're good to go! Glad you found the issue and good luck with the upgrade.

jub jub

Never seen an 01 spring fail! You need to go easy on the old girl!

gmblack3

iTrader: (1)

I try but she just begs for a beatin'

mrr23

iTrader: (3)

yes the chain is still stock. i have no concerns about the chain. if there was a concern, i'm sure roger vinci wouldn't let me put them on.

Z06 Steve

iTrader: (8)

save your money dual springs are overkill if youre retaining stock cam.just get another set of Z06's.you might need the money saved for some other repairs down the road.1.8 are not compatable with any aggressive cam lobes like comp xer.hth

mrr23

iTrader: (3)

as you can see from his initial post, he wants something that'll hold up to some of his 'hard driving' days. it's obvious his original LS6 didn't hold up to the task. he doesn't specify if his 'hard driving' days involve turning the motor to 6500 rpms. if it does, then that's the most likely reason why one failed. stock springs DO NOT like 6500 rpms.

and while we are on the subject, why aren't the 1.8 ratios compatible??? haven't seen a real answer on it yet. there are too many successful professional racing teams that use higher than stock ratio. some in the 2.0:1 range. and if they ever were incompatible, then he'd just get the proper cam to go with them. there are no limitations on choosing when you want the right one. here's a prime example:

comp cams 220/224 .581/.581 115 LSA using the vinci/crane 1.7 accelerated lift rockers vs vinci 055 216/224 .551/.551( @ 1.7) 113 LSA using 1.8 accelerated lift rockers (bringing lift to .583/.583) less intake duration same lift

TEST 4 AND 5 COMPARISON
TRANSMISSION LOCKED IN 3RD WITH YANK TRANNY TRICKER, MANUAL SHIFTING MODULE
ALLOWS THE RUN TO START BELOW 2000 RPM WITHOUT THE TRANSMISSION DOWNSHIFTING TO 2ND GEAR
THIS GIVES A MUCH MORE ACCURATE VIEW OF THE TRUE POWER INCREASES OR LOSSES DOWN LOW
THIS IS THE INDICATOR OF HOW WELL A VEHICLE WILL RUN IN EVERYDAY STREET CONDITIONS, & HOW IT MIGHT AFFECT 60 FOOT TIMES

gmblack3

iTrader: (1)

What kind of break-in should I do after the install of the new dual springs and rockers?

What about oil? I have some 4500 mile M1 0-40 in there now. I was going to change that soon, should I do it when I change everything or a few weeks after?

thanks!

mrr23

iTrader: (3)

if you are concerned about heat cycling the springs, then drive about 50 miles normal. then let it cool down. as far as oil goes, so your normal routine there.

gmblack3

iTrader: (1)

Will do.

Thanks!

One more question.

Was looking at the install instruction here for the rockers:

http://www.cranecams.com/pdf/438e.pdf

I'm gonna have some help from a friend that has done a lot of Gen1/II smallblock work. He was wondering why you need to let it bleed down every 1/4 turn for a total of 2 turns after the final zero lash adjustment? Then it says another 30 mins of bleed down.

Thanks!

narcszm

To heat cycle your springs, watch your oil temp gauge since you have one. keeping the car under 3500 RPM, drive until your oil is 200°F. Then keep it at or above 200° for at least five minutes. Then, go park the car overnight.

After that, for good sustained life of your springs, don't take the car over 3500 RPM until your oil temp is at least 100-120°F. Usually takes me about two miles of driving to get it to that temp.