offset rocker arms
Thread Starter
Safety Car
Joined: Jan 2001
Posts: 3,637
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From: Norwalk Ct
offset rocker arms
I was looking at some new rocker arms and i see them advertised as being std, .100", .150" etc offset. What are the advantages/consequences of using an offset rocker arm?
Nick
Nick
Race Director
Joined: Dec 1999
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From: Forked River NJ
They are required on some heads that have very large ports. In order to get the ports large enough they have to push the pushrods over slightly to clear the ports. The makes it needed to offset the rocker arms to maintain good geometry.
Race Director
Joined: May 2005
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From: Millington Illinois
St. Jude Donor '08-'09
Remember these used on the old Trick Flow Twisted wedge heads. Think they screwed up the valvetrain geometry and caused side loading of the valve guides and premature valvetrain failures. But they flowed good. Sounds like race only stuff to me.
Le Mans Master
Joined: Apr 2000
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From: cincinnati ohio
St. Jude Donor '09
I have Trick Flow G1 twisted wedge heads with standard 1.6 aluminum rollers. Geometry is spot on.
The intake valves are 13* and careful pushrod selection is crucial...but no offset....
The intake valves are 13* and careful pushrod selection is crucial...but no offset....
Last edited by yellow 72; Mar 21, 2007 at 08:32 PM.
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From: Corsicana, Tx
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There are also *backset* rockers that help straighten out geometry issues. Real handy on AFR big block heads!!
JIM
JIM
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Joined: May 2005
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From: Millington Illinois
St. Jude Donor '08-'09
I think they required special pistons with different reliefs but on a blower motor with dish pistons probably not an issue. I know they flow big numbers especially on the exhaust side. Probably work great on the blower motor if the valvetrain is set up right.
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Le Mans Master
Joined: Apr 2000
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From: cincinnati ohio
St. Jude Donor '09
It's only as good as the builder! I think they required special pistons with different reliefs but on a blower motor with dish pistons probably not an issue. I know they flow big numbers especially on the exhaust side. Probably work great on the blower motor if the valvetrain is set up right.
I think they required special pistons with different reliefs but on a blower motor with dish pistons probably not an issue. I know they flow big numbers especially on the exhaust side. Probably work great on the blower motor if the valvetrain is set up right.
