Once again thank you to everyone who replied.

when i get the heads i will check the installed height, of each spring. i may end up getting new ones ( current dual gold "extreme's" have maybe 3000 kms (1864 miles) on them) stronger pushrods, and spend alot of time making sure i have the correct wipe pattern on the roller tip. i will flycut the pistons for added saftey. .


very insightful.

thanks.

 

I posted a link in this thread on some pushrod information. Might be worth a peak. Link

 

What is the story on CTS-V lifters? (I have a CTS-V LS6 running stock lifters with a mild cam, Patriot Gold Springs, .600 lift, Comp hardened pushrods, Harland Sharp-OEM rockers.) Thanks.

 

The CTS-V along with the LS7 replacement have been causing valve train failure specially with really aggressive lobes. With milder cams there has not been any issues that I have seen but when you start getting into the larger more aggressive cams they have cause valve train failure. There is a thread here "GM fails again..." there is a lot of info. I have only used the stock LS1 lifters and I feel very safe shifting at 6800 and red-line at 7K and I never have had an issue or other wise.

 

Thank you.

 

This is what happens when you use those yellow terra rockers or in my case the comp pro mag rockers. They are good rockers but do not work right in a high rpm, aggresive cam lobe application. I switched back to stock rockers and it fixed my problem.

https://ls1tech.com/forums/generatio...-6450-rpm.html

 

Rhodes, can u explain a little more about your valve float, ? I mean are u sure its what u are expierencing? I have a bigger cam (intake wise)with 1.7 hardened p.r.,LS7 lifters, and patriot dual golds, and stock rockers and spin to 6500 on 1-2 and 6700 on my 2-3 shift.and go thru traps at 6900..Maybe something else with u, trans slippage or something in your tune..?

 

haven't experienced it yet. i posed the question after a telephone conversation with texas speed. its winter up here and i am just ordering some more go-fast/engine reliability parts. the conversation essentially was regarding the increased mass of the yella terra's possibly causing valve float @ higher RPM's. As also brought up on here, some belive the springs to be too weak, along with me needing better lifters and thicker pushrods.

i will end up trying out the yellas solong as i can get them set up how i need them to be.

 

What valvetrain set-up are your running then?

Christian

 

YT UL's, PAC 1521 springs, Morel bar lifters and 3/8 pushrods and a cam with a whole lot more lift than the T-rex and I've never had valve float to 6800RPM.

Spend the coin and do it right - once.

Just my $.02

 

You probably have some very unstable cam lobes. We probably have more high rpm hydraulic roller setups than anyone and 75% have the YT Ultralites on them and we don't seem to have all these issues? With some of the lobes we use the Jesels and the YT have gained power over stock rockers actually.

 

https://ls1tech.com/forums/13140558-post30.html

These are the YT ultralites 1.8 ratios with steel valves and about .700 lift and I don't see any valve float. We have a few going to about 8000 rpm as well with 1.7s. You need the right springs and lobes and pushrods. I used to use the stockers even more and still do on the lower .600 lift stuff and they work great as well but with the larger lift stuff they tend to tear everything up we see that really do turn a lot of high rpm. With the extra lift you can get when running roller rockers we make more power too. All the low and mid 9 second hydraulic roller stuff we have has gotten faster when using the better rockers and much more lift.

 

I got a set of the TFS 215s & they recommend running roller rockers because of the bronze valve guides. I am not running a real high lift cam just a TSP 228 & was wondering if I could get away with running the stock lifters? I am a lil paranoid of gettin the YTs, been hearing they have been breaking on a few people.

 

I have used both rockers with the TFS although I had to modify the stands to make them fit on the stock rockers. I have seen the YT break a few times as I have with most rockers. The stock ones just eat the tips off the valves and themselves when they are floated a alot or the needles fall out although that has never happened to us on the stock rockers but the tips wear out really bad when people jack them way up. We have had littel problems with eth stockers but we get them all beat up a lot especialy when people shim them up a lot.

 

Set up CORRECTLY YT UL's work good for their intended purpose. I only spin 6500 but have no valve float looking at the dyno sheet and they are quieter than the stockers were on my old heads with the same cam.....

 

dose the stock rocker defleck more causing more clearance?

 

It deflects more causing slightly less lift as I understand it...

 

Saw this thread was bumped up so i'll fill in .

i installed the YT 1.7 RR. valve train seems quieter. i got lucky and got a perfect wipe pattern without shimming , first time. i only plan to spin the car to 6500 rpm now. it did that without issue when it was cam only with stock rockers, LS7 lifters and 7.425 rods.

i used a PRLC when i changed heads and ended up with 7.350 PR's .

somthing i do whenever i install new parts, is to use synthetic lucas oil stabilizer for when in install new parts, i gave each rocker a good shot, so the first time they get put into motion, they have some lubricant on them.oil change, drive 500kms, change oil again.

its getting tuned next tuesday, and i'll let you guys know how that goes.