ZL1 with LS9 cam

[srt0739]

Originally Posted by dmax86

part # 12638427

Cool, thanks!

[ZO6 Bryan]

Originally Posted by dmax86

ZR1


<li style="margin:15px; margin-top:-1em;">Valve Springs – Valve Spring Free Length

53.1–53.7 mm


2.09–2.11 in


<li style="margin:15px; margin-top:-1em;">Valve Springs – Valve Spring Installed Height

45.75 mm


1.8 in


<li style="margin:15px; margin-top:-1em;">Valve Springs – Valve Spring Load – Closed

400 N at 45.75 mm


90 lb at 1.8 in


<li style="margin:15px; margin-top:-1em;">Valve Springs – Valve Spring Load – Open

1326 N at 31.5 mm


298 lb at 1.24 in

Looks like both have the same spring to me!

[The Baron]

I was told different by LPE. someone pull the SPRING part number for zl1 and zr1.. thats the only way you will now.

[Irnwkrkev]

I've been running this cam for two years in my 11' SS LS3 with the stock springs without any problems. Of course this is N.A. and boost should have some higher spring pressures. I didn't gain any power with a dyno tune but it did need some more fuel at part throttle.

Mine has a bit more of a lope. I was going to degree it but when I realize I didn't have a multi index timing chain I just installed it with the dots on the gears. 428rwhp with stock manifolds and cat deletes! Not bad for $100 cam

[DrkPhx]

Look at the open spring pressure; they're different. The LS9 uses the same spring as the 02-04 LS6 and LS3. The LSA uses the same spring as the L92 which is really the original 01 LS6 spring rated to .525 lift.

Beehive style springs

• Standard LS6/LS3 springs
• 1.250" @ 295 lbs. pressure
• 1.800" installed height @ 90 lbs.

pressure
• Max lift .570"


Beehive style springs

• Standard L76/L92 springs
• 1.800" installed height @ 90 lbs.

pressure
• Max lift .520"
• 1.300" @ 264 lbs. pressure

[Irnwkrkev]

I'm pretty sure those are the same springs. Add the extra 50 thousands lift and the pressure would be up to295lbs.

[The Baron]

Onec says max lift 520.. other says 570.. ls9 cam is 55x... I think ill spend the 90 bucks on springs..

[ZO6 Bryan]

Originally Posted by DrkPhx

Look at the open spring pressure; they're different. The LS9 uses the same spring as the 02-04 LS6 and LS3. The LSA uses the same spring as the L92 which is really the original 01 LS6 spring rated to .525 lift.

Beehive style springs

• Standard LS6/LS3 springs
• 1.250" @ 295 lbs. pressure
• 1.800" installed height @ 90 lbs.

pressure
• Max lift .570"


Beehive style springs

• Standard L76/L92 springs
• 1.800" installed height @ 90 lbs.

pressure
• Max lift .520"
• 1.300" @ 264 lbs. pressure

The open pressure is higher because the spring has been compressed more. 1.250" vs 1.300"

[ZO6 Bryan]

Originally Posted by The Baron

I was told different by LPE. someone pull the SPRING part number for zl1 and zr1.. thats the only way you will now.

It's GM part # 12625033 for both engines.

[mlee]

Why would you not tune it..

[The Baron]

so are they shimmed differently? there has to be a reason one says lift to 520 and other says 570

[dmax86]

FYI
after my CAI and LT's i will be tuning.... as far as the valve springs im not too concerned i may throw another set in there but i am not experiencing any valve float or power loss or anything of that sort.

and those valve spring figures posted earlier are straight from gmglobal "SI" service information (not from a random internet search or wiki)

[DangerZL1]

Did you install the cam yourself?

[The Baron]

Spring failure equals engine failure.