roller rockers
Thread Starter
Drifting
Joined: Jun 1999
Posts: 1,673
Likes: 0
roller rockers
I'm ready to move my RPM range up a bit so I thought I'd try some 1.6 rollers. My torque is a little much for a fairly light car with 3,70' (OK 3,82 effectively) but the specs on a ZZ4 say 355 horse at 5250. So with a bigger cam (basically what a ratio change on the rockers does) will move the power range up a little. Then if that isn't enough, I can always go to a single plain or better flowing heads. Anyway I was all ready to order the Chevy 1.6's from Jim Pace's when a Summit catalog came to the door. They have Crane 1.6's (I think they are better than Chevrolets) a lot cheaper. The only question I have is the Chevrolet ones are self aligning. Will the non self aligning work and are they a pain to align? I've never put in rollers, is it really hard to get right?
Thanks, your STUPID, but curious car guy,
BBBBob :seeya
Thanks, your STUPID, but curious car guy,
BBBBob :seeya
Burning Brakes
Joined: Jul 2000
Posts: 963
Likes: 0
From: melbourne,Australia
Re: roller rockers (Robert Holtman)
Bob,make sure that you check measure your pushrods with new rockers...you will usually need to change the p/rods if you are changing the geometry...Chevy Hiperformance mag did a recent article on this as part of their Bowtie Basics feature.....i have the paired shaft roller rockers which are self aligning...they are pedastal mount with lock nuts so you dont need guide plates or stud girdles..john :chevy
Intermediate
Joined: Jun 2001
Posts: 46
Likes: 0
From: Sydney, NSW, Australia
Re: roller rockers (jdunne)
John,
What brand rockers did you get? and where from?
I suspect my rockers are going to fail. have allready had them repaired.
Mine are Yella Terra platinum twin shaft. If i need to go to a diff brand I
still want twin shaft atleast. Id rather not have to import a full shaft
setup.
Cheers, Chris.
What brand rockers did you get? and where from?
I suspect my rockers are going to fail. have allready had them repaired.
Mine are Yella Terra platinum twin shaft. If i need to go to a diff brand I
still want twin shaft atleast. Id rather not have to import a full shaft
setup.
Cheers, Chris.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
Re: roller rockers (Robert Holtman)
Anyway I was all ready to order the Chevy 1.6's from Jim Pace's when a Summit catalog came to the door. They have Crane 1.6's (I think they are better than Chevrolets) a lot cheaper. The only question I have is the Chevrolet ones are self aligning. Will the non self aligning work and are they a pain to align?
Also consider Comp Cams Magnum self-align 1.6 roller tips pn 1418-16 ... AND ... their Pro-Magnum self-align 1.6 full rollers pn 1318-16.
Intermediate
Joined: Jun 2001
Posts: 46
Likes: 0
From: Sydney, NSW, Australia
Re: roller rockers (jdunne)
John,
The pushrod seats broke :/
I have new pushrods with the ball end on them and a new set of anti pumpup
lifters on there now.
I'm hoping i dont have any problems with them anymore but I still have my doubts.
Anyway time will tell.
Cheers, Chris
The pushrod seats broke :/
I have new pushrods with the ball end on them and a new set of anti pumpup
lifters on there now.
I'm hoping i dont have any problems with them anymore but I still have my doubts.
Anyway time will tell.
Cheers, Chris
Race Director
Joined: Jun 2000
Posts: 10,046
Likes: 675
From: FL
Re: roller rockers (Robert Holtman)
Bob,
If you don't have guide plates, you need self-aligning rockers. If you have guide plates, you must use non-self aligning rockers so that they are not fighting themselves.
The ZZ4 (as with all current GM crate motors) comes with self aligning rockers. Hence, they must be replaced with self aligning rockers. To go to non-self aligning rockers, you need to add guideplates (requires screw in rocker studs) and hardened pushrods (may be an issue in terms of length with the hyd-roller lifters).
If you don't have guide plates, you need self-aligning rockers. If you have guide plates, you must use non-self aligning rockers so that they are not fighting themselves.
The ZZ4 (as with all current GM crate motors) comes with self aligning rockers. Hence, they must be replaced with self aligning rockers. To go to non-self aligning rockers, you need to add guideplates (requires screw in rocker studs) and hardened pushrods (may be an issue in terms of length with the hyd-roller lifters).
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Pro
Joined: Nov 2000
Posts: 594
Likes: 0
From: Tucson AZ
Re: roller rockers (Robert Holtman)
Some may not agree with me but the General spends big bucks developing engine parts that have to stand up to the 4 or 5 year warrantee. I would recommend the GM 1.6 rockers even though they cost a little more. These rockers were used on production engines (I think LT4 - anyone?) and in my opinion, are a better quality part than aftermarket.
Pro
Joined: Jun 2001
Posts: 672
Likes: 0
From: Quebec
Re: roller rockers (VetteNut72)
Some may not agree with me but the General spends big bucks developing engine parts that have to stand up to the 4 or 5 year warrantee. I would recommend the GM 1.6 rockers even though they cost a little more. These rockers were used on production engines (I think LT4 - anyone?) and in my opinion, are a better quality part than aftermarket.
Better pay a little more now than break down and pay anyway later.
Stephan
[Modified by American Boy, 9:56 PM 9/11/2002]
