Some parts too look at (Valvetrain)

[geoffinbc]

All you guys are installing your LS1/LS6 springs at a shorter install height than the spring is spec'd at. No big deal really. But if you are looking for a few more thou valve lift and/or an alternative retainer then check out this one from Comp. It is designed to be used when installing LSx springs on and LT1 or Vortec head.

Stock LSx retainer on the right.



Also for an alternative spring, Comp has this one which is stiffer than an LS6/LS2 spring. Good for a longer duration and higher lift cam such as a Milzy Stange 1 (maybe stage 2) or a comp 260 or 272 cam (for hybrid guys)

Stock LS2/LS6 spring on left

[SappySE107]

RE: Some parts too look at (Valvetrain)

The shop here told me the stock LS2 spring should be good to about .580 lift on our motor (with some room to spare of course). I dont know if we have a reason to go to .550 lift but who knows. Nice find. Got the part numbers?

[geoffinbc]

Springs are 26915-16 (or-1 order 12 times)
Retainers are 787-16

The Comp springs were also cheeper than the LSx springs and I get Cost+10% on GM parts. So thats good news.

[v6h.o.]

I can totally see the Comp springs being cheaper than the LS2/6 springs. The LS2/6's are 5 times more expensive than the LS1 springs.

cost +10% on gm parts here too and still the LS2/6's are 15 a spring (Cdn $) where as the LS1 springs are roughly about 3 $ per spring or so.

Good pics Geoff. I hand'nt seen the different retainer before.

[SappySE107]

I dont see that part number listed for the valve spring.

What is the LS1 spring part number from GM?

[FallenZ24]

Would there be any benifit to using ls1/ls2/ls6 springs with a stock(3X00) cam? Any harm to the valvetrain?

-Joseph

[SappySE107]

LS1 isn't much stiffer. LS6/LS2 on the other hand are a lot stiffer. I wouldn't use the LS2/6 springs on a stock cam, just no reason for it. No harm to the valvetrain that I have seen reported but more pumping loss on the engine equals less power. Valve float wouldn't be an issue though:P

[tejohnson]

How about stock cam with forced induction? 5200RPM @ 11 PSI did a pretty good job at practically pushing my valves open with the stock springs. The valve float was very noticable. What keeps do ya use with those retainers? Finally, what seats are you looking at? ID locaters, or OD cups?

[AaronGTR]

Stock LA1 springs are 75lb @ 1.701" and 230lb @ 1.260". Thats .441" of measured compression, and the LA1 has .436" of valve lift. Stock LS1 springs are 76lb @ 1.8" and 220lb @ 1.32". Thats .480" of measured compression, and the LS1 has .472/.479" of valve lift. So basically an LS1 spring at an LA1 installed height and lift would have slightly higher closed pressure and about the same open pressure. Not a whole lot of difference though. I have a set of LS1 springs left over if you want 'em.



Thats interesting info on the retainers. I assume they made them so they also sit on the valve at the same height so they don't interfer with the rocker? Using those would lower your spring pressure a tiny bit too (if thats what you wanted). I don't see much use for them though since we've pretty much determined the LS6 springs will let us run plenty of lift still even at our lower height.

[SappySE107]

Id use the stiffer spring with boost.

[tejohnson]

I have LS6 springs, SI valves, stock retainers and keeps, and viton seals. Just lookin for something to serve as a good seat. Was eyeing the Crane valve cups for the LS1 (144460-16) which Pace sells them for $~28, but I will need to open the ID up from .505 to .550.

[torq455]

Lets not forget what types of lifters we are using. Rollers are heavier. If I had the rollers and bigger cam, I'd want the LS2/6. For the hybrids, I don't see why one couldn't use the LS1 on the 272 with 1.6 rockers.

[torq455]

Lets not forget what types of lifters we are using. Rollers are heavier. If I had the rollers and bigger cam, I'd want the LS2/6. For the hybrids, I don't see why one couldn't use the LS1 on the 272 with 1.6 rockers. Oh, and great find on the retainers and springs!!

[tejohnson]

Springs are 16915-16 (or-1 order 12 times)
Retainers are 787-16

The Comp springs were also cheeper than the LSx springs and I get Cost+10% on GM parts. So thats good news.

Is it 16915-16, or is it 26915-16? Also, for the LS6 Springs, Lingenfelter is purdy cheap:

http://www.lingenfelter.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=12586484&Category_Code=

But I figure you get them cheaper...

[geoffinbc]

Woops 26915

Edited old post