TaTommyWS6

I'm asking because I already have LS6 springs, but they are going on LS1 heads. I was wondering what size shims come with the hotcam kit?

Thanks.

02 Silver Z

iTrader: (8)

ttt

KSB

You want to use the shims for the LS6 springs. I bought the hotcam kit that comes with Ls6 springs& shims.

You can use either shim, but the tech who did my install definately liked the LS6 shims that came with kit better than the LS1[stock] shims

Have had cam in over 2years,love it.

<img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" />

<small>[ April 02, 2003, 08:25 PM: Message edited by: KSB ]</small>

TaTommyWS6

Here is my siituation:

I have a 2000 TA with stock LS1 heads.

A friend of mine bought a set of new CNC heads that came with LS6 springs. He does not need the springs, because he is going with heavier duty ones for his cam....

I know that the Hotcam kit comes with LS6 springs and shims. I was planning on purchasing the cam only (off of another member hopefully...) so I would imagine I need the shims to complete the setup...


CHIKN,
"If you bought 02 LS6 springs they dont need shims. "

Are the "02" LS6 srings different than other LS6 springs?

Thanks!

Tommy <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

PS This is confusing! <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

robertbartsch

...as soon as my new valve seals arrive we can swap out the LS6 seats and springs for your setup...perhaps sunday if your around...(i will likely just polish up the chambers in the new heads and leave the CNC cuts in the exhaust/intake ports...)


....are you confusing spring seats with shims?

The seats are those black tall steel things under the springs...at the top of the seat is a rubber valve seal...

...shimms are like washers to adjust the spring pressure/hieght...

TaTommyWS6

I don't think I'm confusing seats with shims.

The HOTCAM kit comes with SHIMS not SEATS!

So I assume I need shims with my heads....

All I want to know is what size (thickness) shims come with the HOTCAM kit but no one has answered me!

Tommy <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

robertbartsch

...so are you saying that in order to use the stock Ls1 spring SEAT and the 2002 LS6 spring together that you need a shimm?

...or are you saying the Hot cam requires a higher spring pressure and therefore the shim is needed to increase the LS6 spring rate/height?

...i suppose you could just use the LS6 seats and LS6 springs and avoid the shimm issue altogether......the Linfelter spec sheet (tag) that came with the heads says the LS6 spings are good to .570 lift!!!!

..the sdpc ls6 heads have 2002 seats, springs and valves...

TaTommyWS6

I'm saying, the only thing I know for sure is that the HOTCAM kit comes with the "necessary" shims.

So what are they?!?!?

Tommy <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

robertbartsch

...don't know about this...??????

who sells the complete kit so you could see a picture of the kit? ...i saw somthing on this in SDPC site ...I think...

robertbartsch

http://www.sdpc2000.com/cart.asp?act...=1981&pid=1089

See above SDPC picture of the Hot Cam and discription of the complete cam kit...

...it says it uses 2001 LS6 springs....no mention of shimm, however,,,it looks like the round things in the picture are stock retainers ...but i suppose they could be shimms...

robertbartsch

I asked this question in another post and got the reply below from "Grabbing Gears"

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chikn

Grabbing Gears
Member # 7200

posted April 03, 2003 10:41 AM
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2001 LS6 springs are a good bit shorter than 2002 and need shims in an LS1 head. The 2002 springs dont need shims at all to work on an LS1 head.

You can use the stock spring seats with no shims in your LS1 head with 2002 springs.

TaTommyWS6

So the springs you have are 2002 LS6 springs? I wonder if there is some way to check the size of them....

I would hate to do 16 spring swaps wrong...

Tommy <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

PS Why do they have to go around changing springs sizes! <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

robertbartsch

...the stock 2002 LS6 valves are longer than LS1 valves...so I assume this is why GM uses a taller LS6 spring in the later model heads...

However, it still does not fully explain why the shimms are needed when installing 2001 LS6 springs in a stock LS1 head....

...You might call the technical hotline at SDPC; they are very knowledgeable about this stuff...

robertbartsch

SDPC Tech Hotline = 806.798.4108

The LS6 ported assembled heads are part number 88958622.

The Lingfelter tag has a January 2003 production date.

Tell them your LS6 springs are pea green in color (UHG!) and they do not have shims only a black spring seat...

robertbartsch

quote:
--------------------------------------------------------------------------------
Originally posted by robertbartsch:

However, it still does not fully explain why the shimms are needed when installing 2001 LS6 springs in a stock LS1 head....

--------------------------------------------------------------------------------
YOU SAID IN REPLY:
Sure it does, the shims set the shorter springs at the correct installed height. Otherwise the seat pressure of the spring would be very low.m

**************************************
I'm totally confused now.

I thought if the LS1 valve length is shorter than the LS6 valve lenght, then the shorter 2001 LS6 spring would not need to be shimmed. In other words, a shorter 2001 LS6 spring should not need to be shimmed in a LS1 head with a shorter LS1 valve.

Using your logic, a shimm would ONLY be necessary if you tried to install a 2001 short LS6 spring in a 2002 LS6 head with a long valve.

I'm I from Mars and are your from Earth or visa versa?

Thanks ...cause this seams like rocket science!

While you are at it, please tell me if the longer LS6 valves in an LS6 head will require shorter pushrods if installed in an LS1 engine assuming no change in cam base circle diameter....

...the answer is slightly more complicated since my LS6 heads are milled .055 but lets ignore this variable for the moment....

ThanX...

robertbartsch

This is the description of the heads from the SDPC web page. It says the heads come with NEW 2002 LS6 springs...

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LS6 CNC Ported Assembled Aluminum Cylinder Heads
Price: $985.00
Part # 88958622


Best buy on the planet! Unbelievable performance from fully CNC ported cylinder heads. Some of the best low and mid-lift numbers we have ever seen from a stock size valve. These heads will flow over 200cfm at 0.300" lift and 290+ at 0.500". Fully assembled with the 2002 Z06 light-weight valves and the new '02 valve springs. These heads have been milled 0.055" to bring the combustion chambers back down to approximately 60cc. Care must taken to check pushrod length and proper intake installation when using these cylinder heads. Price is for each cylinder head.

TaTommyWS6

Oh boy! I opened a can of worms!

(Too bad I still didn't get the answer to my original question!) <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

Tommy <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

KSB

The Hotcam "Kit" comes with - Hotcam, 01 LS6 springs & shims [Not retainers]for the 01 LS6springs. As I remember the shims are brass ,& slightly larger then the stock LS1 shim. They
[shims] definately seat the new spring better.

I assume they were designed for it & should be used! As far as what the thickness, ? You could call a local GM dealer & the parts dept. might be able to tell you. [01 LS6 valve spring shim]

Bottom line if you are going to run "hotcam" you need the 01 LS6 springs & shims !

<img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" />

<small>[ April 03, 2003, 12:30 PM: Message edited by: KSB ]</small>