Phil99vette

iTrader: (11)

Just checked mine should be here tomorrow, monday at the latest.
Phillip

WCR_Timmy

I'm toying with the idea of getting these rockers but I don't know if they'll work with my setup(GTP stage 2 heads w/dual valvesprings from Thunder Racing).

Does anyone know if these rockers will clear dual-valvesprings?

Phil99vette

iTrader: (11)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by WCR_Timmy:
<strong> I'm toying with the idea of getting these rockers but I don't know if they'll work with my setup(GTP stage 2 heads w/dual valvesprings from Thunder Racing).

Does anyone know if these rockers will clear dual-valvesprings? </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Read C5corvette's post, he is running 987s with the YTs and work fine.
Phillip

jmX

So the real key is figuring how how much more lift you're going to get from these rockers. If somebody is on the edge of piston to valve clearance these things may push it over the edge. From what I remember from yellaterra's post a while back, you'll get another 20-25thousanths lift even if you go with the 1.7 ratio rockers.

Just be careful out there.

I may have to get a set of these too one day. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Bink

I sure hope I don't have clearance problems...I ordered mine (1.7) today. I'll check 'em! <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

bparker

I dont remember reading this - are you sure? I dont want to slap a valve! <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by jmX:
<strong> So the real key is figuring how how much more lift you're going to get from these rockers. If somebody is on the edge of piston to valve clearance these things may push it over the edge. From what I remember from yellaterra's post a while back, you'll get another 20-25thousanths lift even if you go with the 1.7 ratio rockers.

Just be careful out there.

I may have to get a set of these too one day. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">

Smoke_ur_5.0

iTrader: (2)

We have run them on cars without 987s..no problems. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Phil99vette

iTrader: (11)

I just recieved my rockers a day early and let me tell you they are top notch. The rockers are nice and light as well as thick. I dont see many issues with them flexing. The bearing design is top notch and everything seems to be made to my expectations.
Phillip

bparker

Excellent - please let us know if you show any gains when you get things back together..

BP

Bink

If I remember correctly yella terra said that with higher lift cams flex occured with the stock rockers resulting in less valve opening. So with these rockers they saw a more accurate transfer of the lobe lift to valve lift (truer liftvalue).Cheers.

Phil99vette

iTrader: (11)

We will find out soon how they work with my 232/238 .595/.605 111 lsa cam. I think they will be a nice compliment to my forged 347cid motor.
Phillip

jmX

Binks, the point is, with the new rockers you're going to have more lift than you already do. Whether you want to look at it as the yellas giving more, or the stock ones giving less, it doesn't matter. And when people say cam blah blah blah has no clearance issues, that is almost always with the stock flexing rockers so in reality, we're all running .540'ish lift cams instead of .560'ish lift cams like we thought we were (assuming yella terra's testing was accurate). With the new rockers, your .540 (advertised as a .560) is now a .560. Some of the guys with .590 lift cams were probably only getting .565 of that lift with a stock rocker so 25 thousanths more might just push them over the edge. It of course all depends on duration and timing of the lobes, but you get the general idea of what I'm saying.

Z28

is hydrolic roller or shaft mount??which one is the best <img src="https://ls1tech.com/threads/images/graemlins/confused.gif" alt="" /> <img src="https://ls1tech.com/threads/images/graemlins/confused.gif" alt="" />

jfm

iTrader: (4)

jmx,excellent info.With a big cam you would need to recheck P/V if going over to the Yella Terras.You could gain at least 20 thousanths lift with these rockers.

Bink

YEP! Shakes head - YES.....where are all the Icons and stuff?? Thanks for the answer JMX.
Joel

Visceral

iTrader: (1)

Conceivably though, the stiffness could be creating far more of a dynamic change in the valvetrain than the static change you can check with a p/v test. The valvetrain does some amazing "flexing" and oscillating at various RPMs, and that flex can be in the pushrod or the rocker arm. Stiffen one up and you change the way the cam lobe "hits" the valve. That wouldnt be seen on a slow P/V test. You need either a Spintron or alot of experience to assess that. What Im worried about it that the area under the upramp of the cam is going to be greater, and that is where some contact may occurr at higher rpms. In some cases, the lowest p/v clearance is not at the peak lift of the cam. And I dont think the peak lift is where these rockers are making a difference. One way or the other, stiff rockers, big hard cams, and stock pistons are going to have to meet a test at 6800-7000 rpm before we know for sure

chris

horist

For what it's worth, I finished my motor today, I've got Comp R lifters, hardened pushrods, Comp 987 double springs, and Yella Terra 1.7:1 rockers (TR224 cam). There's VERY little valve-train noise! not much more than there was stock, so not sure how it would have sounded with stockers but my valve-train is pretty damn quiet w/these yella Terras .. very glad I bought them now

Now it's time to Dyno and get to the track

Visceral

iTrader: (1)

With a sewing machine sounding motor, it may well work out that the YellaTerra's are worth the money just to quiet the valvetrain. Knocksensor or not. In fact Ive heard this enough now that I think Im gonna order a set.

chris

C_Williams

My engine stand is ******. You can rotate the engine with your little finger and never get tired. Every shop or engine builder that does more than a few motors per year should have one. When assembling and checking, this stand makes the job fun.

Bink

My engine stand is ******.
C5Corvette - I like the name! Where can I buy one and How much?TIA.
Joel