Increased ratio roller rocker arm problems
Thread Starter
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Freshman User
Joined: Jun 2004
Posts: 27
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From: Calgary, Alberta
Increased ratio roller rocker arm problems
I have a 1989 lincoln town car w/ non H.O. 5.0 Litre.
I am putting on the HO intake and T.B. from a 1988 mustang, and heads from a 1988 F-150.
I have 1.7 ratio Crane roller rocker arms, and Comp Cam's titanium Conicle Valve Spring.
I am using a Fel-pro head gasket.
Okay here is the problem: After installing the heads etc. I am now putting on the roller rocker arms (I have turned the over twice to determine T.D.C.)
the intake side of the Front Driver's side will not tighten to the push rod even after turning the bolt its furthest point of 2.5 turns.
This indicated to me that 1) the rods are too short?, or 2) the pedistal needs to be milled/shaved?
Alittle while back I had a thread asking questions about the potential of such a problem, and it got alittle ugly. Almost everyone suggested I will be okay with my stock length rods though.
( https://www.ford-trucks.com/forums/a...x.php/t-253614 )
I could really use some advice.
Thanx,
Corey
I am putting on the HO intake and T.B. from a 1988 mustang, and heads from a 1988 F-150.
I have 1.7 ratio Crane roller rocker arms, and Comp Cam's titanium Conicle Valve Spring.
I am using a Fel-pro head gasket.
Okay here is the problem: After installing the heads etc. I am now putting on the roller rocker arms (I have turned the over twice to determine T.D.C.)
the intake side of the Front Driver's side will not tighten to the push rod even after turning the bolt its furthest point of 2.5 turns.
This indicated to me that 1) the rods are too short?, or 2) the pedistal needs to be milled/shaved?
Alittle while back I had a thread asking questions about the potential of such a problem, and it got alittle ugly. Almost everyone suggested I will be okay with my stock length rods though.
( https://www.ford-trucks.com/forums/a...x.php/t-253614 )
I could really use some advice.
Thanx,
Corey
Senior User
Joined: Jul 2004
Posts: 139
Likes: 0
From: Front Range of Colorado
The answer to your question is the same as the 351W pushrod length question. You will either need to use a pushrod length tool, or contact the cam and rocker arm companies tech support for help.
Pam
Pam
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Freshman User
Joined: Jun 2004
Posts: 27
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From: Calgary, Alberta
I read the posts for the 351w and it seems like I have a unique problem.
My ford dealership told me that I may be able to use 5.0 litre f-150 rods because they make ones that are either .006 over or under stock in length. Unfortunatly they are impossible to find.
Keeping that in mind, is it okay to shave down the pedistal, or maybe the part that the pedistal bolts to ( no idea if it has a name, but the raised cylinder that the rocker arms bolt to) maybe I can shave that and then shim the exhaust side which I am not having any problems with?
What are your though everyone?
My ford dealership told me that I may be able to use 5.0 litre f-150 rods because they make ones that are either .006 over or under stock in length. Unfortunatly they are impossible to find.
Keeping that in mind, is it okay to shave down the pedistal, or maybe the part that the pedistal bolts to ( no idea if it has a name, but the raised cylinder that the rocker arms bolt to) maybe I can shave that and then shim the exhaust side which I am not having any problems with?
What are your though everyone?
New User
Joined: Sep 2004
Posts: 2
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From: livermore, ca
Rocker arm ratio
It is not as simple as just making the push rod longer or shorter, first you have to work the correct geometry. You may need a lower rocker shaft, or you may need longer rods, or both. You need to use a dial indicator to measure it. At half rocker arm lift, your valve should be at one lift also for the most performance.
New User
Joined: Sep 2004
Posts: 2
Likes: 0
From: livermore, ca
"It is not as simple as just making the push rod longer or shorter, first you have to work the correct geometry. You may need a lower rocker shaft, or you may need longer rods, or both. You need to use a dial indicator to measure it. At half rocker arm lift, your valve should be at one lift also for the most performance."
Sorry meant to say "At half rocker arm lift, your valve should be at one half lift also for the most performance."
Sorry meant to say "At half rocker arm lift, your valve should be at one half lift also for the most performance."
