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roller rocker new YT6645 vs Comp Ultra Gold 1.72

   
Old 12-02-2012, 10:17 AM
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Default roller rocker new YT6645 vs Comp Ultra Gold 1.72
Just would like to read others thoughts on these two part numbers.

Heads: AFR 230cc v2

Spring specs:
155# @1.810
412# @ 1.210


The AFR site recommend Yella Terra Ultra Light.
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Old 12-02-2012, 01:25 PM
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Depending how how aggressive cam is we recommend the yella terras. We put the comps on and lost 90rwhp. Comp caused valve float power started to drop at 5500 rpm. Motor was a 427 TT AFR 245 hydraulic roller 235/235 with same spring pressures.
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Old 12-02-2012, 03:28 PM
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What's the lift on the cam you're going to use?

If the lift is around .600" or less the I'd just up grade the bearings on the stock rockers, if not I'd consider going with Jesel SS rockers. I've lost my trust in the YT rockers after breaking several with properly set up PAC 1521 valve springs.
Last edited by 99Bluz28; 12-02-2012 at 03:52 PM.
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Old 12-02-2012, 04:28 PM
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.624 lift. Jessel is a good recommendation, but my friend 416 NA break them once a year. Car runs 9.8 NA FULL WEIGHT 01 Z06.maybe try T&Ds.
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Old 12-02-2012, 04:51 PM
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The Cam is BruteSpeed blower cam, not really an 'aggressive' cam. Somewhat I guess for a 347.
I was going to go with the trunion upgraded stock rockers, however, the head has bronze valve guides.
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Old 12-02-2012, 05:32 PM
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Originally Posted by Champion Motors
.624 lift. Jessel is a good recommendation, but my friend 416 NA break them once a year. Car runs 9.8 NA FULL WEIGHT 01 Z06.maybe try T&Ds.
What?...so what's the opening spring rate on his valve springs?
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Old 12-02-2012, 09:34 PM
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Originally Posted by 99Bluz28
What's the lift on the cam you're going to use?

If the lift is around .600" or less the I'd just up grade the bearings on the stock rockers, if not I'd consider going with Jesel SS rockers. I've lost my trust in the YT rockers after breaking several with properly set up PAC 1521 valve springs.
He has bronze valve guides and needs rollers. YT are your only real option...plenty of guys running them with no problems.
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Old 12-02-2012, 10:02 PM
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Yeah plenty do; but I'm not one of them.
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Old 12-02-2012, 10:15 PM
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Originally Posted by vmapper
The Cam is BruteSpeed blower cam, not really an 'aggressive' cam. Somewhat I guess for a 347.
I was going to go with the trunion upgraded stock rockers, however, the head has bronze valve guides.
XER lobes aren't aggressive?
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Old 12-03-2012, 12:14 AM
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Originally Posted by Martin@Tick
XER lobes aren't aggressive?
Sorry, Yes, XER have a fast ramp rate, you are correct.
I had huge lift in my head for some reason. (tired).
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Old 12-03-2012, 03:48 AM
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YT did a recent design upgrade to further strengthen the rocker. Make sure you get the new design. You can tell because the location of the "1.7" is to the right side of the pushrod cup as you look at them from the roller tip end. Here is a link to show the differences: Link
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Old 12-03-2012, 06:48 AM
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Originally Posted by 99Bluz28
What?...so what's the opening spring rate on his valve springs?
155 seat
410 open
Hyd roller
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Old 12-03-2012, 09:16 AM
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Originally Posted by vmapper
Sorry, Yes, XER have a fast ramp rate, you are correct.
I had huge lift in my head for some reason. (tired).
Not a problem, just didn't want anyone to read this thread and think that XER lobes were easy on valve-train parts.
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Old 12-03-2012, 11:03 AM
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Originally Posted by Champion Motors
155 seat
410 open
Hyd roller
If I follow the thread, are you referring to your post that some Jesel's have failed as well? Also, some of the Jesels were not designed for more than stock lift, which Jesel set is failing?
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Old 12-04-2012, 08:46 PM
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Originally Posted by vettenuts
If I follow the thread, are you referring to your post that some Jesel's have failed as well? Also, some of the Jesels were not designed for more than stock lift, which Jesel set is failing?
Just the standard LS Jesels, exhaust ones were breaking while cruising around.
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Old 12-05-2012, 03:40 AM
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Originally Posted by Champion Motors
Just the standard LS Jesels, exhaust ones were breaking while cruising around.
There was a thread on the other forum from someone I was corresponding with while doing my build (he was doing heads/cam at the same time) that had a set of Jesels and found out there was an interference on the bottom of the rocker such when the lift went much over stock. Jesel confirmed to him that they weren't designed for high lift. Here is a link to that thread if it will help in any way: Link
Last edited by vettenuts; 12-05-2012 at 03:50 AM.
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Old 12-05-2012, 06:43 AM
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Lift is low 600s and no interference.
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