Are all 1.6 RR's the same net effect?
Thread Starter
Burning Brakes
Joined: Mar 2002
Posts: 1,035
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From: Atlanta Ga
OK, I saw on a photo the small lip and figured that was the deal but wanted to check. OK, at least I know what I need if I continue down this path. Now I just have to figure out if I really want to put them on. Not sure putting 1.5's on is really doing much other than making things run smoother, and not sure I should go to 1.6 on the rest of the stock set up? Decisions, Decisions!
Thread Starter
Burning Brakes
Joined: Mar 2002
Posts: 1,035
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From: Atlanta Ga
Well no that I have everything opened up I have a question. My stock 1989 L98 has some type of guide plates installed. I'm trying to figure out if I need self-aligning or not. Everything I read say I do for this year, but I thought that guide plates went with non self-aligning rockers?
I'll try to post a photo later.
I'll try to post a photo later.
Instructor
Joined: Apr 2009
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From: Modesto California
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Michael S. Palmer
Race Director
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From: Slidell Louisiana
Remember FAST, Cheap, Reliable choose two.......
I didn't use aluminum on my DD
Hardened guideplates and 7/16s studs
Forged pistons on 6" rods .005 in the hole
7005 fuel cutoff
Sound of SBC revving at 6800 on the street ....Priceless
NOT ALL PARTS are created equal........If you want dependable and fast you will have to pick decent parts......this is my daily driver. Data log is of trip home from work........you can tell since I'm never in a rush on the way to work ......
However, if I were going to use a different valvetrain it would be Jesel shaft mount rockers and a solid roller with a larger lift than the .615 I have now.
Mike
I didn't use aluminum on my DD
Hardened guideplates and 7/16s studs
Forged pistons on 6" rods .005 in the hole
7005 fuel cutoff
Sound of SBC revving at 6800 on the street ....Priceless
NOT ALL PARTS are created equal........If you want dependable and fast you will have to pick decent parts......this is my daily driver. Data log is of trip home from work........you can tell since I'm never in a rush on the way to work ......
However, if I were going to use a different valvetrain it would be Jesel shaft mount rockers and a solid roller with a larger lift than the .615 I have now.
Mike
Last edited by aboatguy; Dec 16, 2009 at 12:11 AM.
Race Director
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From: WI
From what I've seen the narrow body rockers cost much more. I used the normal size body and stud Summit brand 1.6 full roller rockers and they fit fine. Since I track mine I used the non self align and installed new hardened guide plates.
Drifting
Joined: Aug 2000
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From: Colleyville Texas
Info off the LS1 Tech site:
B. Roller Rockers:
Purpose: Transfers the motion of the cam along the pushrods and assists the valves to open.
Benefit of Upgrading: Upgrading from the stock 1.5 stamped steel rockers to 1.6RR's will increase the lift that the camshaft is putting out as well as producing an extra degree or two of duration at the valve and increased overlap.
Ex: Lift of cc503 w/1.5 RR's = (.503/.510) divide by 1.5 then multiply that number by 1.6 to get lift with 1.6RR's = (.537/.544).
Required?: No, but highly recommended.
Popular Choices: Crane Golds, Comp Cams Magnums, Comp Cams Pro-Magnums.
SA or NSA?: Self-Aligning should work fine for some of the smaller camshafts that do not see revs past 6200/6300rpm. Non-Self Aligning is cheap insurance that can handle high rpm rev's better because the use of guide plates will ensure that the rockers cannot slip off the valve tips. NSA use 7/16" studs which is stronger than the 3/8" studs that most SA rockers have. Non-Self Aligning will require the use of hardened chromemoly pushrods, studs, and guideplates (8).
Recently put the ultra Pro-Magnums on my 396. The Pro-Magnums worked fine for 8 years.
B. Roller Rockers:
Purpose: Transfers the motion of the cam along the pushrods and assists the valves to open.
Benefit of Upgrading: Upgrading from the stock 1.5 stamped steel rockers to 1.6RR's will increase the lift that the camshaft is putting out as well as producing an extra degree or two of duration at the valve and increased overlap.
Ex: Lift of cc503 w/1.5 RR's = (.503/.510) divide by 1.5 then multiply that number by 1.6 to get lift with 1.6RR's = (.537/.544).
Required?: No, but highly recommended.
Popular Choices: Crane Golds, Comp Cams Magnums, Comp Cams Pro-Magnums.
SA or NSA?: Self-Aligning should work fine for some of the smaller camshafts that do not see revs past 6200/6300rpm. Non-Self Aligning is cheap insurance that can handle high rpm rev's better because the use of guide plates will ensure that the rockers cannot slip off the valve tips. NSA use 7/16" studs which is stronger than the 3/8" studs that most SA rockers have. Non-Self Aligning will require the use of hardened chromemoly pushrods, studs, and guideplates (8).
Recently put the ultra Pro-Magnums on my 396. The Pro-Magnums worked fine for 8 years.
Last edited by Red Rocket; Dec 16, 2009 at 12:08 PM.
Race Director
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From: Slidell Louisiana
Safety Car
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From: San Marcos CA
Don't use regular non-self aligning roller tip rockers on an L98. After about 30k miles, the side to side scrub will take out a valve keeper and drop the valve. Don't ask me how I know.
(luckily the piston was unhurt).
(luckily the piston was unhurt).
Le Mans Master
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From: Kempner Texas
Jake
West Point ROCKS! Nation's TOP COLLEGE per Forbes Magazine!! Graduation Day Parade 20 May 2010!!!
Race Director
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From: WI
I test fit the rockers with the V/C untouched and everything was fine. I didn't have all the rockers bolted in and the pre-load set though. I decided to trim the drip tabs just in case. No issues. Some sets are $50 or more for the narrow.
Drifting
Joined: Aug 2000
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From: Colleyville Texas
Its hard to tell since they were added with the new AFR 195cc competition heads. They are stronger, lighter, and more durable compared to the Pro Magnum's. Worth a rew more RPM's per Comp Cam's.
Race Director
Joined: Jan 2005
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From: Slidell Louisiana
You have me perplexed.....did you mean self aligning, they have the little ears that straddle the valve stem and some folks have had keeper/retainer issues with them. The non-self aligning use guide plates and should not have any effect on the keepers.
Race Director
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From: Slidell Louisiana
Mike
