Lt1 Roller Rockers
Thread Starter
Racer
Joined: May 2005
Posts: 497
Likes: 1
From: Casa Grande Az
Lt1 Roller Rockers
The time has come for me to purchase new roller rockers for my LT1 build.
I am looking for some information on several different brands that I am looking at.
Comp cams
Crane
Scorpions
I my heads are worked lt1 heads , cam is a CC305, aftermarket springs, ect.
I do know that I am looking for 1.6 ration rockers , full roller, self aligning. Not sure if I need narrow body or not. (Maybe a question somebody could answer for me).
Anyway , price / quality , bang for the buck. Does anybody have any information to add for the 3 listed brands above ?
Thanks in advance!
I am looking for some information on several different brands that I am looking at.
Comp cams
Crane
Scorpions
I my heads are worked lt1 heads , cam is a CC305, aftermarket springs, ect.
I do know that I am looking for 1.6 ration rockers , full roller, self aligning. Not sure if I need narrow body or not. (Maybe a question somebody could answer for me).
Anyway , price / quality , bang for the buck. Does anybody have any information to add for the 3 listed brands above ?
Thanks in advance!
Race Director
Joined: Jan 2002
Posts: 12,261
Likes: 85
From: O'Fallon Missouri
I've ran both Crane Gold 1.6 SA rockers and Comp Cams Pro Magnum 1.6 SA RR's. Both a high quality rocker, only difference was the Cranes were a bit quieter.
Currently I am running Comp Cams' 1.6 non self-aligning Pro Magnum roller rockers with TrickFlow guide plates and Chromemoly pushrods. You should consider a similar setup for a more stable valvetrain and future engine mods.
Currently I am running Comp Cams' 1.6 non self-aligning Pro Magnum roller rockers with TrickFlow guide plates and Chromemoly pushrods. You should consider a similar setup for a more stable valvetrain and future engine mods.
Instructor
Joined: Apr 2010
Posts: 197
Likes: 0
From: Dalton Georgia
I am thinking about roller rockers this winter. I don't know much here about the lt1 basically i'm still in the learning curve. Im greatfule for the info on the crane gold. I take it my stock heads will be fine with these things correct? Also is their any issues on regular driving and idle with the 1.6's? I want a mild mod nothing wild. Did the 1994 lt1 come with roller lifters or not? if it didn,t is all i need to change are the lifters? or will it require a cam too. I would love to go to roller rockers and roller lifters if it doesnt have roller lifters.
My car is currently totally stock.
My car is currently totally stock.
Race Director
Joined: Jan 2002
Posts: 12,261
Likes: 85
From: O'Fallon Missouri
Chris, your 94 already has roller lifters, and you can install roller rockers without any driveability issues. If you are installing a 1.6 ratio rocker I would also recommend a valve spring change.
Instructor
Joined: Apr 2010
Posts: 197
Likes: 0
From: Dalton Georgia
Thanks for letting me know that STL. Now I know I don't have to worry about roller lifters. I had seen the issue with needing to change the valve springs if i went 1.6. What is the factory spec? is it 1.5 or 1.52? I see both on the market. I really would like the roller rockers because I know this will make the motor run smoother and reduce friction and heat on the motor. This will be a winter project but I like to feel something out before I do it. Tht way I know what to look for and what I need.
Thread Starter
Racer
Joined: May 2005
Posts: 497
Likes: 1
From: Casa Grande Az
I've ran both Crane Gold 1.6 SA rockers and Comp Cams Pro Magnum 1.6 SA RR's. Both a high quality rocker, only difference was the Cranes were a bit quieter.
Currently I am running Comp Cams' 1.6 non self-aligning Pro Magnum roller rockers with TrickFlow guide plates and Chromemoly pushrods. You should consider a similar setup for a more stable valvetrain and future engine mods.
Currently I am running Comp Cams' 1.6 non self-aligning Pro Magnum roller rockers with TrickFlow guide plates and Chromemoly pushrods. You should consider a similar setup for a more stable valvetrain and future engine mods.
Would comp cams part number CCA-1318-16 be what I am looking for?
http://www.summitracing.com/parts/CCA-1318-16/
The engine is a 2nd motor that I have built for the car, its sitting on the stand just waiting for roller rockers, soon as they arrive I can slap them on , prime it , button it up and begin planning and plotting for the install.
Again, thanks!
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Thanks for letting me know that STL. Now I know I don't have to worry about roller lifters. I had seen the issue with needing to change the valve springs if i went 1.6. What is the factory spec? is it 1.5 or 1.52? I see both on the market. I really would like the roller rockers because I know this will make the motor run smoother and reduce friction and heat on the motor. This will be a winter project but I like to feel something out before I do it. Tht way I know what to look for and what I need.
It's best to swap springs since the 1.6s increase valve lift around .030" which dramatically reduces spring coil clearance. Many guys cut corners and don't install new springs, but new ones is the best way to go.
Jake
My son, Ryan M. Cameron, graduated from West Point on 22 May 2010! He was commissioned as a 2nd Lieutenant and I pinned on his first pair of "Butter Bars" PROUDEST DAY OF MY LIFE!!
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Instructor
Joined: Apr 2010
Posts: 197
Likes: 0
From: Dalton Georgia
GM refers to them as 1.5s but when measured they are more like 1.4x
It's best to swap springs since the 1.6s increase valve lift around .030" which dramatically reduces spring coil clearance. Many guys cut corners and don't install new springs, but new ones is the best way to go.
Jake
My son, Ryan M. Cameron, graduated from West Point on 22 May 2010! He was commissioned as a 2nd Lieutenant and I pinned on his first pair of "Butter Bars" PROUDEST DAY OF MY LIFE!!
It's best to swap springs since the 1.6s increase valve lift around .030" which dramatically reduces spring coil clearance. Many guys cut corners and don't install new springs, but new ones is the best way to go.
Jake
My son, Ryan M. Cameron, graduated from West Point on 22 May 2010! He was commissioned as a 2nd Lieutenant and I pinned on his first pair of "Butter Bars" PROUDEST DAY OF MY LIFE!!
Race Director
Joined: Dec 2006
Posts: 10,383
Likes: 4
What's the general impression of beehive springs? I have read that when they fail they offer no protection at all whereas the traditional springs will still act a bit as a spring. But are beehive springs really failing that often?
Race Director
Joined: Jan 2005
Posts: 10,641
Likes: 13
From: Slidell Louisiana
A while back Comp changed the source of their 918s and they had some bad batches....
So once again stick with Pac and don't look back...
I've been running a set of PACs on my daily driven 355 I have many datalogs with the engine reving above 7000rpm... with NO ISSUES ...engine has been together for a couple of years.
MIke
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
Race Director
Joined: Jan 2002
Posts: 12,261
Likes: 85
From: O'Fallon Missouri
Hmmmmm I already have a nice set of Isky guide plates, guess that means I should follow suit and get some non self-aligning rockers and be done with it.
Would comp cams part number CCA-1318-16 be what I am looking for?
http://www.summitracing.com/parts/CCA-1318-16/
The engine is a 2nd motor that I have built for the car, its sitting on the stand just waiting for roller rockers, soon as they arrive I can slap them on , prime it , button it up and begin planning and plotting for the install.
Again, thanks!
Would comp cams part number CCA-1318-16 be what I am looking for?
http://www.summitracing.com/parts/CCA-1318-16/
The engine is a 2nd motor that I have built for the car, its sitting on the stand just waiting for roller rockers, soon as they arrive I can slap them on , prime it , button it up and begin planning and plotting for the install.
Again, thanks!
EDIT: I just did a search and couldn't find anyone selling the 1305's, maybe they are discontinued. If you want to run Comp rockers you might have to get the new Ultra Pro Magnum. But, I would still recommend the 7/16" rockers/studs.
Last edited by STL94LT1; Jun 11, 2010 at 09:29 PM.
Heel & Toe
Joined: Apr 2007
Posts: 21
Likes: 0
is there any problem using the 3/8 roll rockers ?
why some people prefer to go with 7/16 studs rockers?
also what good valve spring for 1.6 roll rockers,and do the stock retainers ,fit in this case (1.6 rockers and aftermarket springs)?
thanks.
why some people prefer to go with 7/16 studs rockers?
also what good valve spring for 1.6 roll rockers,and do the stock retainers ,fit in this case (1.6 rockers and aftermarket springs)?
thanks.
Instructor
Joined: Apr 2010
Posts: 197
Likes: 0
From: Dalton Georgia
I'm glad all of you are discussing the springs here. I want to start with the roller rockers because I know that regardless of what I do later they are a good investment and will only magnify any other mods I might do.
Melting Slicks
Joined: Feb 2008
Posts: 3,286
Likes: 6
From: Palm Beach
One good thing about double vs beehive springs is that if you break one of the doubles, you don't drop the valve. There was a sting of beehive failures but I don't recall the details. Probably a batch of bad wire.
I don't think there are actually that many spring makers. A lot of folks just put their name on them.
I waited 3 weeks for a set of Cranes that were back ordered. Finally went with Howard doubles.
I don't think there are actually that many spring makers. A lot of folks just put their name on them.
I waited 3 weeks for a set of Cranes that were back ordered. Finally went with Howard doubles.
Last edited by MK 82; Jun 12, 2010 at 04:34 PM.
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
The LT4 101# spring will be fine for your car on 1.6 full RR's. Pace Performance has a set of 16 for under $40.
I would go ahead and get new retainers if you want. They are cheap and you can get them locally.
If I didn't have the Pro Magnums already I'd get these.