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Should my valvetrain be ok for an S1X cam?

LS6 springs have been failing on some occasion lately as well... but coil bind is going to hurt your timing chain more than your springs usually.

Good thing nobody ever breaks timing chains....
 


So my crow 105s are bad. My ls6s that I'm selling are a better choice? I used a new dampner and new chain. The rollermaster single was not fitting my on crank and someone else said it retards timing ? Cause it's for the Australian cars? Last part not sure of tho
 
A 105 is going to have a better peak lift characteristic than a LS6 spring, but it will have a higher chance of floating.

105s will also be easier on a stock timing chain, but LS6 springs are pretty easy as well (and I will soon prove that 130s on a stock chain work fine as well.)

I have installed 130's onto the intake side of every supercharged cam install I have done in the last few years, and LS6 springs on the exhaust, stock timing chains in all of them. The only exception was a local that wanted a stupid low idle (against my advice) and we installed a double roller and a full set of LS6's (yes they float) on a NIC.
 
Hixc said:
iv'e done it once, the install with me and my brother, however it spun a main bearing 50 miles after the build. I just don't have the time or space to do it over again. and besides, Bill is a Professional

Here is the pic of the rockers i have. i believe they are the 3rd gen rockers to be exact. at stock ratio.

IMG_1056.jpg


those are whats in my valvetrain as far as running the S1X on stock heads.

IMG_1054.jpg

IMG_11251.jpg
Click to expand...

Very nice.. Yes, Bill def knows exactly what he is doing!
 




1.9 rollers are a very small upgrade in peak lift over stock on a XP or s1x. 1.8s are considered a nearly insignificant upgrade over stock rockers in lift.

You probably do not need clearanced guides with 1.9 rollers on a xp or S1x any more than you need it with stock rockers.
 
Wait a sec.
He stated they were 1.6rr. I was interested because I have 1.9s and wanted to sell or trade for 1.6rr.
Then his description page states they are in fact 1.9s. So I replied asking how can you pull off running such a high ratio rocker with a cam?

I would assume the heads are NOT modified if he thought they were 1.6 stock ratio.

I have yet to find out how hard/easy it would be to run my 1.9s rather than sell or trade them

Thanks
 
I have clearly said you would never want to run a 1.9 roller rocker over a stock rocker... a stock rocker would be a big upgrade over a roller.

"finding" a way to use them would be going out of your way to "find" a way to make less power....
 
what is so hard to understand here?

Roller rocker = downgrade... its a simple equation.

It MAY be possible to make 1-2% more horsepower with a 1.8-1.9 roller rocker assuming you installed a 150# valvespring to fight the massive amounts of valvefloat they would cause on a bigger cam.
 


they are 1.6rr, however im not sure how to explain how i got them, i bought the car pre-modded. the seller stated that they were 1.6, which makes sense because the heads are stock. dont think you can run 1.9 on s1x with stock heads.


are you saying that i will benefit switching my rockers out for stockers? i wonder why they were installed to begin with.
 
yes as stated at least 3 times now you would see at minimum an extra 20whp and less valve float if you installed stock rockers.
 
I've still yet to see any of your proof Scott on how stock non roller tip rockers create more peak lift than a 1.80:1 or a 1.90:1 roller rocker.

Considering...

An S1X with 1.8's are near .600 lift...

And stock rockers create a max lift of what... .520?

You also can NOT run 1.9's on stock heads without milling the guides with an aftermarket cam...stock guides can only handle IIRC .550 lift.
 
It is shocking to know that stock rockers have been making this lift for so long... but it is true.

The heads and valve guides get beat the *** up on S1x and XP cam cars even with all of the required mods.... which makes it obvious that you are seeing some crazy high lift numbers.

I have measured stock heads with modded retainers and a viton aftermarket seal to be good for about 570 lift with the bottom of the retainer firmly pressed into the seal (with a finger or 2 pulling on the valve). When installing a 1.8 roller next to a stock rocker, peak lift was mostly similar, I didnt put enough time into the rig to measure which one gave more or less lift on a xp cam... the cam/lifter dynamic is one that is hard to emulate on a bench.
 
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