loudsam

I'm installing Crane 1.8 rockers and Crane dual valve springs in my otherwise stock ls1 c5 engine. I've searched and couldn't find satisfactory answers to my worrys. I'm not worried about the Crane stuff, but, I'm wondering if the stock lifters will be alright with the increased lift and spring preasure? I would really appreciate some help with this question. There are so many people on this forum that have had experience with this kind of stuff, I'm certain someone can tell me! Thanks!

Doug

PREDATOR-Z

I'm assuming you are keeping the stock cam?? If so the duals might be overkill. 02 and above LS6 springs or 918 or Manley singles would be more favorable. (seat pressures). Do not worry about the lifters unless you have too many miles on them.
If you allready have these Crane parts, why not get a mild cam with them, VINCI has a few good ones like the 047.

loudsam

Yes, I'm keeping the stock cam, for the time being. Thanks for the info on the single springs. I see you have an a4. Are you using the 047 cam? Also, I'm thinking I'll use an air compressor to hold up the valves while I change the springs. Can you give me any insight on that idea?

jz06man

I agree with Predator Z,
Upgraded springs on a stock cam is overkill, but personally, i would error and do error on the sideof safety.

I have VHP's 1.79-1.72 rockers and could not happier. I am looking to upgrade my springs this summer to the 1.89-1.82 VHP/Crane rocker. I should have done this from the get go, but....

If you are going to do the rockers, I would like at VHP's 047 cam or 062. I have the 062 and it's much stronger then the stock Z06 cam. I have a Z06 and think GM should have put this cam or the 047 from the get go. Let's of torque low and mid without losing anything up top.

You'll not reget the change.

Good luck

smask04C5

iTrader: (1)

ran dual crane spring kit and 1.8 roller rocker kit on stock cam and lifters, no issues 351rwhp/360ft#tq donaldson, dynatech and magnaflow on my 04C5 A4

loudsam

Just wanted to say thanks to everyone's informative replys!! Smask04c5, yours is the exact same set-up that I'm thinking of. Only differance, I've got Borla 2tip stingers, (I love them). But, I am going to install the dynatech supermaxx. Those are great #'s, and about what I was thinking you would see with that set-up! I was thinking that later, (when I've got the money), I would add lpe ls1 ported heads. And, if that's not enough, then as the last resort, I'll consider changing the cam. At this point I don't need much more hp/tq than your set is delivering. What do you think would happen if you added the above heads to your set-up?

smask04C5

iTrader: (1)

now have pp ls6 style heads with VHP BossII cam 216/224 .551 lift, donaldson, crane dual roller chain, 1.8 crane rocker kit making lift.590, crane duals with ti retainers, ati damper, dynatech ss exhaust kit with magnaflow exhaust. with VHP/Crane tuner set on perf. cam 2, car idles at 650rpm with slight chop, pulls incredibly well from about 1500-6200, cooks the run flats. going to put a few miles on car, only 2900 now, then dyno again at VHP

PREDATOR-Z

No no 047 for me, I got a stealth II XE-R.

The compressor method works but I prefer the TDC method as it is fail proof.
If and only if your compressor should stop for whatever reason a valve will drop. (Let us put it this way, I would rather not rely on air to do a spring swap)

vettenuts

iTrader: (4)

Was this a quiet setup? Were those the only mods? Any idea on what the high ratio rockers got you for HP?

I am currently running a Donaldson (just bought a Vararam and will install post-snow), QTP Tri-Y Vette headers and Z06 cat back. 330 HP at the wheels with a very conservative tune done by Slowhawk. I would love to get a few more out of the Vararam and the rockers.

smask04C5

iTrader: (1)

yes, quiet. tuned with VHP handheld tuner about 20 hp for the rocker kit. now have pp ls6 style heads with crane dual spring kit, Vinci/Crane Boss II cam with above stuff and ati damper and crane billet dual chain kit. arp studs hold it together .035 squish and .095 P/V pulls very hard from 1500-6200, idles with slight chop through stock converter at 650 rpm tuned again with VHP tuner. will dyno before i change converter to a yank 3000

jz06man

smask04c5, do you have video clip or sound clip of the car/Boss 2 cam at idle and some reving.. If you od can you post or pm this to me.
TY.

mrr23

iTrader: (3)

i've been running the VHP/ Crane 1.8 accelerated rocker kit and the VHP/ Crane dual springs as well since last april on the stock cam and lifters. no problems at all. i just swapped to the VHP 4.8L heads and moved the springs over to them.

smask04C5

iTrader: (1)

jz06man i can make cars and boats fly, but have no clue how to produce a video clip lol go to www.vincihighperformance.com to valvetrain page and find car cam specs, click on Boss I, sounds similar. remember that VHP accel. lift cams are typically 4-8 degrees smaller duration @ .050 than other cams, but with component parts, produce gains of a much larger cam, without the big cam hassles.

loudsam

Did you notice much increase, in power/torque? Is the valve train quieter? I'm thinking this would be a good "early" mod, since I can change it over to other heads when/if I buy some!

ss rally red

iTrader: (8)

The stock LS6 springs can handle the stock cam with 1.8 ratio rockers. Save yuorself some trouble.

jz06man

cmask04c5,
I know it's on the VHP site, but would like to listen on another car...
I love VHP's prodcucts and Vinici is a great guy, but frankly the clips and graphs on the site are fair at best...
Thanks anyways.

loudsam

What about degredation of the stock springs? There's less than 30,000 miles on them, but I've heard that they'll degrade after awhile.

jz06man

Just change the springs... They have about 30,000 mile or almost, i would not take the chance- change them even it you put new LS6 springs, this is better than keeping the springs which is what i think you thinking of doing...

loudsam

Yea, I kind of think your right, I'd just feel alot better if I had new springs with this rocker set-up. I think your right about the air-compressor method of holding the valves up.

jz06man

You can pay now or when you drop a valve if you go cheap now... Save your self alot of headaches and do it right the first time....
Buy the kit from VHP(rockers & springs) and call Joe Vinici and see if can give you a deal- Better than what on the site now...

If you don't ask the answer is no- If you ask... it's yes,no or maybe... Joe will work with you...