L98 must use shaft rockers??
Thread Starter
Junior Member
Joined: Apr 2009
Posts: 21
Likes: 0
From: New Jersey
Car: 89 Vette - 2009 Vette
Engine: L-98
Transmission: Auto
Axle/Gears: 3.07 .... for now
L98 must use shaft rockers??
I was going to have a shop install ZO-6 lightweight valves in my GM Alum heads but found that Manley states you need shaft mount rockers when using the 5/16" stem valves and that is the stem size of the ZO-6 valves, is this true??
Supreme Member
Joined: Jul 1999
Posts: 1,556
Likes: 28
From: Adrian, Mi, USA
Car: 1988 Pontiac Firebird Formula
Engine: 5.7 TPI
Transmission: 700R4
Re: L98 must use shaft rockers??
That seems really odd.... considering that with center bolt valve covers.... putting shaft rockers in there just isn't going to work......
I would call their tech line, and ask directly.
I would call their tech line, and ask directly.
Joined: Apr 2005
Posts: 7,736
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: L98 must use shaft rockers??
Why would you go to the trouble / cost of installing smaller stem valves in a set of 113 heads?
You can buy aftermarket lightweight valves with the correct stem size that don't require any other changes
You can buy aftermarket lightweight valves with the correct stem size that don't require any other changes
Last edited by vetteoz; Dec 10, 2009 at 01:23 AM.
Thread Starter
Junior Member
Joined: Apr 2009
Posts: 21
Likes: 0
From: New Jersey
Car: 89 Vette - 2009 Vette
Engine: L-98
Transmission: Auto
Axle/Gears: 3.07 .... for now
Re: L98 must use shaft rockers??
It's just a matter of saving money...maybe ! I have multiple sets of LS1 valves left over from the engines I had for my 98, and now that it's gone, and can't return the new sets, I'd like to use them in the L98. If I am going to install the same size valves as the ZO6 had, and already have them, I'd like to know if it's fesible without spending as much as buying completly new sets.
Joined: Sep 2003
Posts: 25,895
Likes: 429
From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: L98 must use shaft rockers??
8mm LSx type valves dont need shaft rockers... I ran them just fine on my L98 with standard small block chevy rockers. Non self aligning with guideplates
AFR heads for small block chevy use 8mm valves
AFR heads for small block chevy use 8mm valves
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