rollers
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Race Director
Joined: Sep 2003
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From: Database Error Indiana
rollers
What full roller rockers will fit under stock L98 valve covers ? I know there are lots of old threads on this but all things change. There are few different ones available now. Looking to bump up the ratio just because its easier than doing a bigger cam. ZZ4 cam for the record.
Instructor
Joined: Oct 2010
Posts: 215
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How do you like the zz4 cam? Also if you try to put 1.6 ratio rockers on stock heads you have to check your retainer to seal clearance and the spring coil bind. Lots of aftermarket heads can handle .544 lift but the stock heads will probably need the guides cut down and new springs.
Thread Starter
Race Director
Joined: Sep 2003
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From: Database Error Indiana
How do you like the zz4 cam? Also if you try to put 1.6 ratio rockers on stock heads you have to check your retainer to seal clearance and the spring coil bind. Lots of aftermarket heads can handle .544 lift but the stock heads will probably need the guides cut down and new springs.
I do have aftermarket heads with big springs.
Thread Starter
Race Director
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From: Database Error Indiana
Team Owner
Joined: Jan 2003
Posts: 20,301
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From: Summerland B.C. Canada
If I had to replace my Cranes, I would go with the narrow body Scorpion rockers.
My Crane Energizers must be the largest SBC rocker on the planet and took a little cover modding to clear. Don't believe you would need to do anything for the Scorpions, but maybe a drip tab trim.
My Crane Energizers must be the largest SBC rocker on the planet and took a little cover modding to clear. Don't believe you would need to do anything for the Scorpions, but maybe a drip tab trim.
Thread Starter
Race Director
Joined: Sep 2003
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From: Database Error Indiana
If I had to replace my Cranes, I would go with the narrow body Scorpion rockers.
My Crane Energizers must be the largest SBC rocker on the planet and took a little cover modding to clear. Don't believe you would need to do anything for the Scorpions, but maybe a drip tab trim.
My Crane Energizers must be the largest SBC rocker on the planet and took a little cover modding to clear. Don't believe you would need to do anything for the Scorpions, but maybe a drip tab trim.
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Drifting
Joined: May 2013
Posts: 1,736
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From: Reno Nevada
I've been running these for 10 years.
http://www.ebay.com/itm/PRW-0335021-SBC-Aluminum-Roller-Rockers-Narrow-Body-1-6-Ratio-3-8-Self-Aligning-/380526071258?pt=Motors_Car_Truck_Parts_Accessories&hash=item58991f0dda&vxp=mtr
http://www.ebay.com/itm/PRW-0335021-SBC-Aluminum-Roller-Rockers-Narrow-Body-1-6-Ratio-3-8-Self-Aligning-/380526071258?pt=Motors_Car_Truck_Parts_Accessories&hash=item58991f0dda&vxp=mtr
Drifting
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From: Reno Nevada
Thread Starter
Race Director
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From: Database Error Indiana
Le Mans Master
Joined: May 2004
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From: Hellinois
Finalist 2020 C4 of the Year - Modified
I just put the narrow body Scorpions on my engine. I did grind off the drippers without checking because everyone here said they did not clear. I have no clearance issues whatsoever and I do believe they are a tad quieter than the Crane's I had before.
Thread Starter
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From: Database Error Indiana
Pro
Joined: Sep 2012
Posts: 610
Likes: 12
From: Seattle Wa
Can anyone tell me how rollers sound on a quiet motor? Ive had race motors with them, but the exhaust was too loud to hear them. Ive read a few posts where guys are experiencing a clattering noise after installing them. Is that cause they were adjusted/installed wrong? Or, is it cheap parts? Trying to keep mine quiet as possible. h
Le Mans Master
Joined: May 2004
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From: Hellinois
Finalist 2020 C4 of the Year - Modified
If you want quiet, stay away from rollers, they chatter. Even though my Scorpions are quieter than the Crane Energizers I had, they still chatter. The sound resembles a solid lifter engine.
Drifting
Joined: Feb 2003
Posts: 1,976
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From: San Antonio Texas
I might be wrong, but I seem to remember a few years back Kevin McClelland; who helped develop the ZZ4, and now writes the Q&A for Chevy High Performance magazine; saying in that section, that cam did not work well with 1.6 rockers. You might want to check into that before pulling the trigger on the new rockers. I don't remember what the reason was, as I wasn't ever interested in that cam myself. Good Luck with your project.
Found it- May 2009 CHP... He says the valves become unstable at higher(?) RPM (bouncing on the seat) and the combo makes a good bit of noise too, both due to the high rate of the lobes.
Found it- May 2009 CHP... He says the valves become unstable at higher(?) RPM (bouncing on the seat) and the combo makes a good bit of noise too, both due to the high rate of the lobes.
Last edited by Curveit; Jul 23, 2013 at 01:42 AM.
Thread Starter
Race Director
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From: Database Error Indiana
Good pics. My covers have been modded. those rockers are nice. Would be my first choice if not for the price.