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Old 08-09-2010, 10:29 AM   #1
06LS2GTO
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Roller Rocker Clearance Issues

Can someone advise which if any Roller Rockers will clear the stock LS2 valve covers? Also, how much if any benefit will they provide on an aggressively cammed LS2 engine? Thanks in advance. "Search" did not produce much info.
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Old 08-10-2010, 08:24 AM   #2
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Originally Posted by 06LS2GTO...View Post
Can someone advise which if any Roller Rockers will clear the stock LS2 valve covers? Also, how much if any benefit will they provide on an aggressively cammed LS2 engine? Thanks in advance. "Search" did not produce much info.

There maybe other makers, but Crane is the only company I am aware of that makes rockers which fit under OE rocker covers without mods.
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Old 08-10-2010, 08:41 AM   #3
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If I were to do it again, I'd pass on roller rockers (unless I had Trick Flows). What I would have done instead was replace the bearings on the stockers.

IMHO: The rollers don't provide enough benefit, and are noisy as hell (I've got Harland Sharps). Stockers haven;t had any reported cases of the ever going bad (aside from losing the crappy bearings.

$130, a vise, and some sockets and you'll easily replace the bearing yourself.

-P
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Old 08-10-2010, 06:06 PM   #4
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Thanks
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Old 08-12-2010, 01:11 AM   #5
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love my yella terras, but they did have clearance issues. just grounded off the little mushroom lookin things under the valve covers and they fit perfectly
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Old 08-12-2010, 08:05 AM   #6
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Quote:
Originally Posted by 06LS2GTO...View Post
Can someone advise which if any Roller Rockers will clear the stock LS2 valve covers? Also, how much if any benefit will they provide on an aggressively cammed LS2 engine? Thanks in advance. "Search" did not produce much info.

Sometimes they clear, sometimes they don't. I would do the Comp Rocker Arm Trunion Upgrade to your OEM Rockers http://www.ls1gto.com/forums/showthread.php?t=361169

FYI, Trickflow makes Valve Cover Spacers for $215.95.

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Old 08-12-2010, 08:18 AM   #7
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Quote:
Originally Posted by 06LS2GTO...View Post
Can someone advise which if any Roller Rockers will clear the stock LS2 valve covers? Also, how much if any benefit will they provide on an aggressively cammed LS2 engine? Thanks in advance. "Search" did not produce much info.

Ahem - your heads have a raised valve cover rail...
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Old 08-12-2010, 08:40 AM   #8
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Originally Posted by Shortyno10...View Post
love my yella terras, but they did have clearance issues. just grounded off the little mushroom lookin things under the valve covers and they fit perfectly

+1 thats what took care of my clearance problems with my Harland Sharps.
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Old 08-12-2010, 09:07 AM   #9
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+1 thats what took care of my clearance problems with my Harland Sharps.

And mine needed more massaging than that. Tolerances are tolerances.

Still... stay with the stockers, get the Comp Cams upgrade kit.

-P
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Old 08-12-2010, 12:52 PM   #10
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Originally Posted by Proth1975...View Post
And mine needed more massaging than that. Tolerances are tolerances.

Still... stay with the stockers, get the Comp Cams upgrade kit.

-P

What did you end up going with to fix yours?
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Old 08-12-2010, 03:01 PM   #11
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What did you end up going with to fix yours?

A Dremel with a cut-off wheel on the "bumps" and a ball peen on the splash shields.

-P
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Old 08-12-2010, 05:19 PM   #12
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Quote:
Originally Posted by rednari...View Post
There maybe other makers, but Crane is the only company I am aware of that makes rockers which fit under OE rocker covers without mods.

I have crane gold 1.7 adjustable RR's and had clearance issues on both rocker covers. Passenger side was much worse and needed some pretty heavy massaging.

I wouldn't buy, or not buy, a rocker solely on the fact that it clears or doesn't clear O.E. rocker covers. Choose your RR based on quality and then budget! It's simple enough to correct any issues and at most adds an hour to the install.
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Old 08-12-2010, 05:40 PM   #13
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I have crane gold 1.7 adjustable RR's and had clearance issues on both rocker covers. Passenger side was much worse and needed some pretty heavy massaging.

I wouldn't buy, or not buy, a rocker solely on the fact that it clears or doesn't clear O.E. rocker covers. Choose your RR based on quality and then budget! It's simple enough to correct any issues and at most adds an hour to the install.

I do not know what type of Crane rockers you have. I have the adjustable type, and they fit under the cover without modifying anything, including the oil baffles.

Don't you just love it when almost all of the rocker manufacturers advertise that they make LSX rockers, but leave out the fact that they may not fit under the cover, or that you must buy the spacer or larger valve covers they will gladly provide...?
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Old 08-13-2010, 04:46 AM   #14
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Quote:
Originally Posted by rednari...View Post
I do not know what type of Crane rockers you have. I have the adjustable type, and they fit under the cover without modifying anything, including the oil baffles.

Don't you just love it when almost all of the rocker manufacturers advertise that they make LSX rockers, but leave out the fact that they may not fit under the cover, or that you must buy the spacer or larger valve covers they will gladly provide...?

I have the gold adjustable RR's (I believe that crane referes to them as race) in a 1.7 ratio.

They fit and the car ran; However, close attention to detail revealed contact on both covers. The oil baffle on the passenger side was worse than the drivers side. The contact was barely noticeable by ear while the car was running and could have easily been passed off as normal valvetrain noise.

During assembly we marked the covers and upon intial start-up used a stethoscope. We then pulled the covers back off and found witness marks on both covers.

If you didn't install yours, I would take 30 minutes out of my day and pull both rocker covers. Better safe than sorry
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Old 08-14-2010, 12:22 PM   #15
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Originally Posted by scryfst...View Post
I have the gold adjustable RR's (I believe that crane referes to them as race) in a 1.7 ratio.

They fit and the car ran; However, close attention to detail revealed contact on both covers. The oil baffle on the passenger side was worse than the drivers side. The contact was barely noticeable by ear while the car was running and could have easily been passed off as normal valvetrain noise.

During assembly we marked the covers and upon intial start-up used a stethoscope. We then pulled the covers back off and found witness marks on both covers.

If you didn't install yours, I would take 30 minutes out of my day and pull both rocker covers. Better safe than sorry

I did install them myself. I took the rocker covers off 6 months later and found no evidence of scuffing whatsoever. My rocker are the 1.8s. Perhaps there is a difference.
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Old 08-14-2010, 12:34 PM   #16
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My Yella Terra's fit fine as long as I didn't use the suppled shims...
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Old 08-16-2010, 06:48 PM   #17
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I had the same problem with the Comp Cams Ultra gold rockers and had clearance issues even after machining. I ended up having to go with 1/2" valve cover spacers. After that, no problems.

Check out this link at GM HTP. http://www.gmhightechperformance.com..._arm_type.html


It has been posted on the forums before and is why I switched rocker arms along with my cam (0.617 and 0.621 lift).

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Old 08-16-2010, 06:58 PM   #18
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It is not a question of which rockers clear the valve covers, but whether your particular set of covers will clear the rockers. Both YT and Scorpion rockers are touted to clear factory covers, but the rub is that the tolerances on the covers are crap. They are all over the place. I had some mild contact with the sheet metal baffling for the no-longer-used PCV outlets. Nothing serious, but irritating nonetheless. I ground off the rivets, bosses, and removed the sheet metal and have no clearance issues without resorting to risers.
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Old 08-17-2010, 02:47 AM   #19
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I had the same problem with the Comp Cams Ultra gold rockers and had clearance issues even after machining. I ended up having to go with 1/2" valve cover spacers. After that, no problems.

Scorpion makes the rockers for Comp.
Quote:
Check out this link at GM HTP. http://www.gmhightechperformance.com..._arm_type.html

It has been posted on the forums before and is why I switched rocker arms along with my cam (0.617 and 0.621 lift).

Tom


*Might* be an issue with TFS heads but the OEM, AFR, DART, Performance Induction heads have no issues going with high lift grinds.

Ed
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Old 08-17-2010, 06:38 PM   #20
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Thanks, Ed. As always, you are a wealth of information and an asset to the forum.

Tom
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