C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Roller Rockers

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Old Feb 29, 2004 | 11:23 PM
  #1  
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Default Roller Rockers

What roller rockers should I buy for my 1990 L98? I want to get a 1.6:1 ratio. And where can I buy them?
Thanx!
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Old Mar 1, 2004 | 12:49 AM
  #2  
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Default Re: Roller Rockers (C490Vette)

Jegs or Summit have plenty to chose from. I'm pretty sure you will need taller vavle covers also. Mine did.
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Old Mar 1, 2004 | 05:32 AM
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Default Re: Roller Rockers (C490Vette)

Check Performance Automotive Warehouse (PAW); their prices are lower on a lot of things; free shipping.

Go with CompCams Pro Magnum 1.6 roller rockers. They're a little more expensive, but are pretty much bullet proof and are re-buildable.

CompCams has been running an ad showing a broked Crane Gold rocker.

Just my thoughts.

Jake
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Old Mar 1, 2004 | 01:01 PM
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Default Re: Roller Rockers (C490Vette)

I installed a set of Comp Cams 1.6 Pro Magnums and have been very happy with them. They will fit under the stock covers, but you'll need to modify them somewhat for clearance including grinding off the drip tabs and narrowing the bolt towers. I opted instead for a set of Proform/GMPP valve covers that are 1/4" taller than stock. They fit with no problem and cleared the RRs without modification. I then sold the stock covers on ebay, which just about paid for my new covers :cheers:

Here's the covers I went with




[Modified by TA, 1:02 PM 3/1/2004]
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Old Mar 1, 2004 | 01:36 PM
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Default Re: Roller Rockers (C490Vette)

Don't forget guide plates. They're about $25.00. Late model motors, 89 and up with aluminum heads, should have them if you install rollers.
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Old Mar 1, 2004 | 01:54 PM
  #6  
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Default Re: Roller Rockers

What about valve springs, should those be replaced on an L98? I know they're needed on an LT1. Even if they are new, your springs are over 12 years old, I'd replace them anyway.

Don't forget guide plates...should have them if you install rollers.
Only if they're not self aligning. The guideplates on later Vettes are they just for assembly purposes, they don't actually guide the pushrods after the lash is set. Not sure what year they switched over, but I thought it was the same year GM went with roller lifters and centerbolt valve covers.


Eric


[Modified by silver & red CE, 12:55 PM 3/1/2004]
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Old Mar 1, 2004 | 02:08 PM
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Default Re: Roller Rockers (silver & red CE)

I've heard that you can get by with stock springs on the L98 but I replaced springs and did new seals while in there when installing my ProMagnums.

If you use self-aligning RRs it's a simple operation of just swapping rockers, setting lash and trimming the drip tabs & bolt towers in the stock valve covers.
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Old Mar 1, 2004 | 02:15 PM
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Default Re: Roller Rockers (65Z01)

I used Halin Sharps but only because TPIS had them on their "garage sale" web page for cheap. I only upped the stud size & trimmed the drip tabs when I first installed but my recent valve job really showed how weak the old stock springs where & the new guide plates really gave much better alignment than the stockers. The center bolt posts would have cleared in the beginning if I had installed the new guide plates.
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Old Mar 1, 2004 | 03:12 PM
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Default Re: Roller Rockers (JAKE)

Have you tried to order anything from them? Forget online, just tried it, better have their $6 + shipping catalog. Can't even check prices!!!!! I wonder if there is enough price difference to offset their "handling charge" for their free shipping.

Sorry, I vent. :mad
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Old Mar 1, 2004 | 03:41 PM
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Default Re: Roller Rockers (C490Vette)

I have a set of used Crane Gold self-aligning 1.6 roller rockers for sale.

PM me if you are interested.
Mike P.
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